Pabean Bay is an estuary waters in which salinity fluctuations occur. This fluctuation requires that the fish living in this location have the ability to adapt. This research is a preliminary study that aims to identify the diversity of... more
Pabean Bay is an estuary waters in which salinity fluctuations occur. This fluctuation requires that the fish living in this location have the ability to adapt. This research is a preliminary study that aims to identify the diversity of fish species in these waters. The study was conducted from January to June 2015 with sampling at intervals of one month. Fishing was carried out at three stations, namely the inside which is the estuary of the river, the middle part and the outside of the estuary to get a representative sample. The fishing gear used are sero, and trammel nets. During the study, it was found that 78 species of fish were included in 39 families. The number of species in each sampling varies. Among the fish found were mainly the family Gobiidae (10 species) and the Family Leiognathidae, Lutjanidae, Sciaenidae and Tetraodontidae (four species each). Several fish species were found in the larval, juvenile and adult stages, and these conditions illustrate the importance of...
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Kerang Gafrarium pectinatum, dengan nama lokal mambekorai, ditemukan pada ekosistem mangrove di pesisir Manokwari Selatan, Papua Barat. Sampai saat ini, spesies kerang ini masih dimanfaatkan oleh masyarakat setempat sebagai makanan.... more
Kerang Gafrarium pectinatum, dengan nama lokal mambekorai, ditemukan pada ekosistem mangrove di pesisir Manokwari Selatan, Papua Barat. Sampai saat ini, spesies kerang ini masih dimanfaatkan oleh masyarakat setempat sebagai makanan. Penelitian mengenai populasi kerang G. pectinatum di lokasi ini bertujuan untuk mendeskripsikan pola pertumbuhan dan parameter pertumbuhan yang meliputi panjang asimtotik (Lµ), koefisien pertumbuhan (K), dan perkiraan umur (t0). Sampel kerang dikumpulkan pada tiga zona (bagian bawah, tengah, dan atas) dengan menggunakan metode transek dan kuadrat. Pada setiap sampel kerang dilakukan pengukuran panjang cangkang dan berat total. Sebanyak 194 individu kerang berhasil dikumpulkan. Ukuran panjang cangkang dan berat total secara berturut-turut berkisar di antara 19,6-44,1 mm dan 2,15-30,74 g. Nilai b yang diperoleh sebesar 0,7214 dengan pola pertumbuhan alometrik negatif yang menunjukan bahwa pertambahan panjang cangkang lebih cepat dibandingkan berat totalnya...
Turtles are reptiles that spend most of their lives in marine waters and will return to land to release their eggs at the location where they were hatched. However, changes in land use that cause damage to coastal habitats, catching... more
Turtles are reptiles that spend most of their lives in marine waters and will return to land to release their eggs at the location where they were hatched. However, changes in land use that cause damage to coastal habitats, catching turtles on land and taking their eggs as well as the threat of predators can cause a decrease in turtle populations. One effort to overcome this is through hatchling breeding activities as was done in Meinyumfoka Village, Manokwari Regency. The objective of the activity is to support community-based conservation through the provision of supporting facilities and community awareness. This activity begins with a site survey, observation and assistance with needs in the captive area, analysis of material needs and costs, organizational activities, and realization of a work plan. This activity was carried out in November-December 2021 in Meinyumfoka Village. The results achieved were the availability of one hatchling hatchery facility measuring 300 cm x 170 ...
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Research Interests: Ecology, Seagrass, Foraging, Habitat, Fauna, and 4 moreTrophic Level, Fishery, Biodiversitas, and Omnivore
Komunitas gastropoda sangat penting sebagai komponen dalam rantai makanan dan dekomposisi di ekosistem mangrove. Penelitian ini bertujuan untuk mendeskripsikan struktur komunitas gastropoda (komposisi spesies, pola sebaran, kepadatan, dan... more
Komunitas gastropoda sangat penting sebagai komponen dalam rantai makanan dan dekomposisi di ekosistem mangrove. Penelitian ini bertujuan untuk mendeskripsikan struktur komunitas gastropoda (komposisi spesies, pola sebaran, kepadatan, dan indeks keanekaragaman) pada ekosistem mangrove di Pulau Padaidori, Kepulauan Padaido, Kabupaten Biak Numfor. Ada dua stasiun yang dipilih untuk dilakukan pengambilan sampel. Periode pengambilan sampel gastropoda berlangsung pada bulan Agustus-September 2021 dengan menggunakan metode garis transek dan kuadrat. Pengambilan sampel gastropoda dilakukan ketika kondisi air surut. Berdasarkan hasil penelitian diperoleh sebanyak 12 spesies gastropoda yang termasuk dalam enam famili (Cerithiidae, Ellobiidae, Littorinidae, Muricidae, Neritidae, dan Potamididae). Umumnya spesies ditemukan di substrat dasar dan akar vegetasi mangrove, kecuali Littoraria scabra yang ditemukan juga pada bagian batang dan daun mangrove. Kepadatan yang tinggi ditemukan pada spesie...
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Ellochelon vaigiensis is a monotypic, catadromous, and widespread species throughout Indo-Pacific region. Taxonomy of the species is ancient and somewhat confused by morphological resemblance. Here, we present and compare... more
Ellochelon vaigiensis is a monotypic, catadromous, and widespread species throughout Indo-Pacific region. Taxonomy of the species is ancient and somewhat confused by morphological resemblance. Here, we present and compare the morphological characteristics of E. vaigiensis from 3 distinct areas, respectively from the type locality (Waigeo Island, Raja Ampat), from Cendrawasih Bay (Biak Island), and Kaimana (Venu and Aiduma Islands). All the samples belong to E. vaigiensis following the species diagnosis given by Harrison and Senou (1999). No significant differentiation is found for all meristic and morphological characters between specimens caught from the type locality and Biak Island. Nevertheless, specimens from Kaimana have a slender body width compared to specimens from Waigeo Island (type locality) and Biak Island. Specimens from Kaimana also display a longer head and a larger eye diameter than specimens from Biak Island. A canonical discriminant analysis made ...
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Ikan kiper, Scatophagus argus (Linnaeus, 1766) adalah salah satu komponen pada ekosistem estuari yang masih sedikit informasi reproduksinya. Oleh karena itu penelitian ini dilakukan dengan tujuan untuk mendeskripsikan aspek biologi... more
Ikan kiper, Scatophagus argus (Linnaeus, 1766) adalah salah satu komponen pada ekosistem estuari yang masih sedikit informasi reproduksinya. Oleh karena itu penelitian ini dilakukan dengan tujuan untuk mendeskripsikan aspek biologi reproduksi jenis ikan ini melalui rasio kelamin, ukuran pertama kali matang kelamin, dan musim pemijahan. Pengumpulan contoh ikan yang berasal dari perairan Teluk Pabean dilakukan setiap bulan di antara Januari dan Desember 2015. Alat tangkap yang digunakan adalah sero dan jaring insang. Sebanyak 431 individu berhasil dikumpulkan yang terdiri atas tahap larva, yuwana, pradewasa, dan dewasa. Perbandingan jumlah individu jantan dan betina relatif seimbang (1,00 : 1,05). Ukuran pertama kali matang kelamin individu jantan pada ukuran panjang total 102,95 mm dan 112,44 mm pada individu betina. Komposisi tingkat kematangan gonad dan nilai indeks kematangan gonad menunjukkan adanya aktivitas reproduksi yang berlangsung sepanjang tahun dan meningkat pada Bulan Ja...
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Manokwari coastal waters are one of the coastal areas that experience very rapid development of development activities from year to year. This condition can disrupt the ecosystem and can also interfere with the growth of gastropods,... more
Manokwari coastal waters are one of the coastal areas that experience very rapid development of development activities from year to year. This condition can disrupt the ecosystem and can also interfere with the growth of gastropods, especially Monetaria annulus. This research was conducted in three locations (Yenkarwar Beach, Nusmapi Island, and Tanjung Manggewa) for two months (October and November 2020). The purpose of this study was to describe the relationship between length and weight, as well as the growth pattern of the gastropod M. annulus in Doreri Bay. Data was collected using a square with a length of 100 m with a width adjusted to the width of the seagrass bed towards the sea. Especially for the location of the waters of Yenkarwar Beach, no individual M. annulus was found during the sampling. The results showed a relationship between length and weight at the locations of Nusmapi I. and Tanjung Manggewa, respectively, namely BT = 0.0017PC2.3883 and BT = 0.0005PC2.8188. Th...
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Research on the potency of arfak rainbowfish as a biocontrol of mosquito larvae was held in Fisheries Laboratory FPPIK, the Universitas Negeri Papua from August to November 2013. The aim of this study was to describe the potency of arfak... more
Research on the potency of arfak rainbowfish as a biocontrol of mosquito larvae was held in Fisheries Laboratory FPPIK, the Universitas Negeri Papua from August to November 2013. The aim of this study was to describe the potency of arfak rainbowfish as a biocontrol of mosquito larvae and compared it with two introduction fish species, Gambusia affinis and Aplocehilus panchax. All of the three species collected from Prafi River, Manokwari were acclimatized for one month in the laboratory. Male individuals were selected and grouped into four size classes according to body length. Three individuals were chosen to represent each species in each size class. Each individual was treated with mosquito larvae (stage IV instars and pupae) of 100 individuals separately, as well as 50 individual instars and pupae simultaneously. The level of predation and selectivity of both prey types was recorded, within 15-minute observation period. All of the three species showed levels of predation on inst...
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The study of food preference of arfak rainbowfish (Melanotaenia arfakensis) in Nimbai and Aimasi streams, and Prafi river system were conducted from June to December 2007. Sampling was carried out monthly for seven months in four... more
The study of food preference of arfak rainbowfish (Melanotaenia arfakensis) in Nimbai and Aimasi streams, and Prafi river system were conducted from June to December 2007. Sampling was carried out monthly for seven months in four different habitat types, i.e. slow littoral, still littoral, pool, and run areas. Results showed that abundance of plankton and macroinvertebrate were found both in slow littoral and medium littoral, especially during low flow period (June to October). Macroinvertebrate that found naturally abundance are insect groups. Arfak rainbowfish are insectivorous, with preponderance index of stomach content during these periods are dominated by insect groups, i.e. Diptera, Ephemero-ptera, Coleoptera, and Trichoptera, so this species categorized as insectivorous. Also, electivity index showed a trend of food specification that naturally abundance. In order to maintain the population of arfak rainbowfish, conservation of their natural habitats is needed, especially ri...
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The study was aimed to describe the spawning season of arfak rainbowfish (Melanotaenia arfakensis) in Nimbai and Aimasi streams, both are located in Prafi river system. Sampling was conducted from June to December 2007 and carried out... more
The study was aimed to describe the spawning season of arfak rainbowfish (Melanotaenia arfakensis) in Nimbai and Aimasi streams, both are located in Prafi river system. Sampling was conducted from June to December 2007 and carried out monthly in four different habitat types using hand net. A total of 752 individual specimens were collected and consisted of five developmental stages, namely egg, larvae, juvenile, young and adult. There was no different proportion in both sexes, either habitat type or time. This species has relatively low fecund, producing approximately 23-1,351 eggs with relatively large diameter (0.5-1.3 mm). Large egg diameter was distributed in posterior of ovaries, with 2-3 modes, and presence of atretic eggs, and was indicated as multiple spawner fish. However, based on gonado somatic index, condition factor, presence of eggs and larva in limited period showed that there were increased reproductive activities in both locations from June to September, with low wa...
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This research aimed to describe habitat condition of endemic arfak rainbowfish, Melanotaenia arfakensis at Sungai Nimbai on June-July and September-October 2012. The study site consisted of seven sampling stations for organisms and... more
This research aimed to describe habitat condition of endemic arfak rainbowfish, Melanotaenia arfakensis at Sungai Nimbai on June-July and September-October 2012. The study site consisted of seven sampling stations for organisms and environmental qualities, from upstream to downstream segment, and each of these stations divided into two habitat types, ie. slow littoral and run areas. The parameters of habitat quality were measured and analysed such as current water, temperature, dissolved oxygen, pH, grease and oil concentration, riparian vegetation, macroinvertebrates composition and abundance, also fish composition and distribution. Riparian vegetation sampling was done at stream sides using 4 m2 plot for seedling and 400 m2 for sapling, pole, and tree categories. Macroinvertebrate and fish at two habitat types were collected using surber of 0.0625 m2 and hand net. The result showed that arfak rainbow-fish were only found at upstream segment. The presence of the species was related...
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Marine tourism is a type of special interest tourism, namely by managing and utilizing marine and coastal landscapes, both those that are managed directly such as swimming, boating, snorkeling, diving, or indirectly such as picnics and... more
Marine tourism is a type of special interest tourism, namely by managing and utilizing marine and coastal landscapes, both those that are managed directly such as swimming, boating, snorkeling, diving, or indirectly such as picnics and beach sports. Nusmapi Island has the potential to be developed as a marine tourism object which has the potential for waters and coral reefs that are in good condition. The purpose of this study was to determine the relationship between the level of public perception and the socio-economic conditions of the local community on Nusmapi Island. In October-November 2020 this research was carried out on Nusmapi Island, Manokwari Regency. The descriptive exploratory method is by conducting a survey to the research location. The data collected were analyzed descriptively by tabulating and displayed in the form of pictures, tables, and graphs to provide an explanation of the information obtained in this study. The relationship between the level of perception ...
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Sources of activity in Dorei Bay come from the Sanggeng market, the Wosi market, the port, the PLTD (Diesel Power Plant), hospitals, hotels, and residential areas. The seagrass system has a function as a food provider, as primary... more
Sources of activity in Dorei Bay come from the Sanggeng market, the Wosi market, the port, the PLTD (Diesel Power Plant), hospitals, hotels, and residential areas. The seagrass system has a function as a food provider, as primary productivity in waters, dampers the arrival of waves, a place for growth and development of biota and sediment traps. Research and information on the accumulation of heavy metals in seagrass, especially Cymodocea rotundata are still very limited, especially in Doreri Bay. This study aims to describe the accumulation of heavy metals in seagrass Cymodocea rotundata, including leaves, roots, and rhizome, comparing the accumulation of heavy metals in seagrass Cymodocea rotundata each location as well as knowing the pollution index of each location. The research was conducted in Doreri Bay, Manokwari, West Papua in August 2018. The sampling locations for Cymodocea rotundata seagrass were around the waters of Pelayaran, Wosi, Yankarwar, Anggrem, and Nusmapi Islan...
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ABSTRACTSeven fish species from seven families are found during this study. The most common species found are Melanotaenia irianjaya (9/10 sites). No introduced species were found in any of the sites. Species richness ranged from 1-5... more
ABSTRACTSeven fish species from seven families are found during this study. The most common species found are Melanotaenia irianjaya (9/10 sites). No introduced species were found in any of the sites. Species richness ranged from 1-5 species per site and was highest in Aikrer Usem stream and Aisen stream. This difference between sites is partially attributed to position in order system and fishing effort. Higher order which is a combination of several creeks provided more diverse microhabitat than the lower ones, thus supporting higher fish diversity. A total of three species (42.9%) which endemic to southern Vogelkop Peninsular and northern Bomberai. Most of species are found including carnivorous, with diet consisted of aquatic and terrestrial insects, and the other benthic invertebrates. The presence of prey group is very closely related to the availability of riparian vegetation in the streams and creeks. Recommendations will include implementation of good forest management in t...
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ABSTRACTArfak rainbow fish, Melanotaenia arfakensis is an endemic fish on several river systems in the northeastern part of the Vogelkop peninsula. This study aims to describe the growth, age at first maturity, and sexual dimorphism of... more
ABSTRACTArfak rainbow fish, Melanotaenia arfakensis is an endemic fish on several river systems in the northeastern part of the Vogelkop peninsula. This study aims to describe the growth, age at first maturity, and sexual dimorphism of this endemic fish on the Nimbai Stream and the Aimasi Stream, the Prafi River system. The fish were caught using handnet, then were measured their standard length and individual weight. Data were analyzed to estimated growth patterns, von Bertalanffy's growth rate, age at first maturity and sexual dimorphism characteristics. The results showed that male growth patterns varied, with a tendency of the increase in body length faster than that of body weight (negative allometric patterns) with b values ranging from 2.886 to 3.132. On the other hand, the female individuals had positive allometric patterns (b values ranged from 3.062 to 3.378). The growth rate (K) of male body length was faster (0.165-0.174) than that of female individuals (0.159-0.163)...
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Information on trophic ecology can provide an understanding of the functional role of fish in an ecosystem, including endemic and native fish groups, as well as alien fish that are introduced through anthropogenic activities. The research... more
Information on trophic ecology can provide an understanding of the functional role of fish in an ecosystem, including endemic and native fish groups, as well as alien fish that are introduced through anthropogenic activities. The research on the trophic ecology of the fish community in the Nimbai Stream, Prafi River system, is intended to describe the interaction of competition and predation, especially towards endemic fish, Melanotaenia arfakensis. Fish samples were collected monthly from four habitat types, i.e., slow littoral, medium littoral, pool, and run from May 2016 to April 2017. A combination of an electric shocker and a hand net was used to collect fish samples. A total of 16 fish species were collected, consists of one endemic species, namely M. arfakensis, nine species of native fish, and six species of alien fish. The Arfak rainbowfish and three native fish species were categorized as insectivorous, four native fish species as herbivorous, and two other fishes as carni...
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Arfak rainbowfish, Melanotaenia arfakensis, is one of the freshwater endemic fish in Manokwari, West Papua. The presence of the Arfak rainbowfish is currently experiencing many disturbances related to anthropogenic activities. This... more
Arfak rainbowfish, Melanotaenia arfakensis, is one of the freshwater endemic fish in Manokwari, West Papua. The presence of the Arfak rainbowfish is currently experiencing many disturbances related to anthropogenic activities. This research, therefore, was conducted to describe habitat condition, distribution and abundance of the Arfak rainbowfish in the Prafi River system spatially. This study was conducted for 12 months on 12 sites in Nimbai and Aimasi Streams, the Prafi River system. The results showed that this species was mainly distributed in the upper reaches of the Nimbai and the Aimasi streams based on the frequency of occurrence (>90.9%) and relative abundance (≥25.5%). The lower fish occurrence and abundance was found at site of the sewerage and downstream. The highest value of the habitat utilization overlap index between Arfak rainbowfish and alien fish species was found in lower reaches. Decreasing habitat quality in lower reaches of the river causes limited distrib...
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Pasar Sanggeng, pasar Wosi, pelabuhan, PLTD (Pembangkit Listrik Tenaga Disel), perhotelan dan pemukiman penduduk yang terletak di pesisir Teluk Doreri Kota Manokwari, menjadi salah satu pusat aktivitas yang melayani kebutuhan masyarakat.... more
Pasar Sanggeng, pasar Wosi, pelabuhan, PLTD (Pembangkit Listrik Tenaga Disel), perhotelan dan pemukiman penduduk yang terletak di pesisir Teluk Doreri Kota Manokwari, menjadi salah satu pusat aktivitas yang melayani kebutuhan masyarakat. Akibat adanya aktivitas yang tinggi tersebut menyebabkan pembungan sampah-sampah organik dan anorganik tidak terawasi atau terkontrol dengan baik. Kondisi ini berlangsung secara terus menerus setiap hari sehingga dapat menyebabkan terjadi degradasi kualitas perairan. Tujuan Penelitian yaitu untuk mengetahui status kualitas perairan di Teluk Doreri Kabupaten Manokwari. Penelitian dilakukan dari bulan Agustus tahun 2016 bertempat di Laboratorium Kelautan, Ilmu Kelautan Unipa dan Laboratorium Prolink IPB Bogor. Lokasi pengambilan sampel air di sekitar perairan Sawaibu, Wosi, Andai, Sowi dan Perairan Maruni. Data parameter yang diambil melalui pengukuran langsung dan tidak langsung. Pengukuran secara langsung meliputi parameter salinitas, pH, suhu dan o...
Riparian vegetation has an important role in maintaining water stability, one of which is the river. This study aims to describe the structure of riparian vegetation so that its implications can be seen for the conditions of rainbow arfak... more
Riparian vegetation has an important role in maintaining water stability, one of which is the river. This study aims to describe the structure of riparian vegetation so that its implications can be seen for the conditions of rainbow arfak habitat on the Nimbai River. The study was conducted in three forest types, namely primary riparia forest, secondary riparia forest and open riparia forest. Sample collection of riparian vegetation was carried out by purposive sampling using sample plots. Plots measuring 2 m x 2 m are used to sample seedling and understorey growth, plots measuring 5 m x 5 m for growth at the stake level, while plots measuring 10 m x 10 m and 20 m x 20 m, for growth of pole and tree levels respectively. The identification results obtained a total of 35 species of understorey and 51 tree-level plants in all three types of riparian forests. Based on the analysis of vegetation structure, it is known that the condition of primary riparia forest and secondary riparian fo...
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The research on feeding effectivity of arfak rainbowfish conducted at Fisheries Laboratory, Faculty of Fishes and Marine Scince, University of Papua in July to December 2016. The purpose of this research is to describe feeding effectivity... more
The research on feeding effectivity of arfak rainbowfish conducted at Fisheries Laboratory, Faculty of Fishes and Marine Scince, University of Papua in July to December 2016. The purpose of this research is to describe feeding effectivity of the fish at several levels of water turbidity. The fish samples used in the treatment, collected from Nimbai Stream, Prafi River system, Manokwari were acclimatized for a month in the laboratory. The fish were selected based on the body length and categorized into six size classes. Each individual of the fish was treated with 200 individuals of mosquito larvae (instar IV stage) at seven turbidity levels (2.54, 25.07, 50.52, 100.20, 500.60, and 800.40 Nephelome-tric Turbidity Unit, NTU) using particles with size of <63um. Feeding effectivity was indicated by the level of preda-tion in a period of 15 minutes. The results of the research showed that average level of predation did not differ among size classes at the low level of turbidity (<5...
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... Melanotaenia eachamensis. Australian Journal of Marine and Freshwater Research 38: 897-902. Beumer JP. 1979. Reproductive ... habitat variables. Hydrobiologia 560: 159-173. Brown MD, Carter J, Thomas D, Purdie DM, Kay BH. 2002. Pulse... more
... Melanotaenia eachamensis. Australian Journal of Marine and Freshwater Research 38: 897-902. Beumer JP. 1979. Reproductive ... habitat variables. Hydrobiologia 560: 159-173. Brown MD, Carter J, Thomas D, Purdie DM, Kay BH. 2002. Pulse ...
The study aimed to describe the diversity and abundance of nocturnal larval and juvenile fish at Pami Estuary, Manokwari. Both of the stages were collected by triangular scoop nets with interval of three hours, starting from 18.00-06.00... more
The study aimed to describe the diversity and abundance of nocturnal larval and juvenile fish at Pami Estuary, Manokwari. Both of the stages were collected by triangular scoop nets with interval of three hours, starting from 18.00-06.00 pm at new moon period during three months (September-November, 2010). Physicochemical parameters showed variation between all of two side the estuary and monthly. All of the larval and juvenile fishes consists of seven orders and 15 families, there are, Anguillidae, Congridae, Ophichthidae, Muraenidae, Elopidae, Mugilidae, Ambassidae, Carangidae, Gobiidae, Polynemidae, Siganidae, Terapontidae, Platycephalidae, Syngnathidae, and Diodontidae. The results showed monthly variation on diversity and highest abundance are found in October (0.061 individu m-2), especially for Anguillidae and Gobiidae that occurred at flood tide. The diversity showed low over these periods (H′ &lt; 0,604). Lower diversity and dominated by few families showed that the community in the estuary Lower diversity and estuary is unstable, as a consequence of physiological difficulties encountered to tolerate drastic environmental changes. Although has fluctuating conditions, this area is an important role as habitat for feeding, spawning, nursering, and spawning migration route for several guilds of fish.
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Informasi yang lengkap mengenai reproduksi, perkembangan awal, dan pertumbuhan larva menjadi sangat penting dalam upaya penangkaran dan reintroduksi spesies ikan yang terancam punah. Salah satu di antara spesies yang mulai terancam adalah... more
Informasi yang lengkap mengenai reproduksi, perkembangan awal, dan pertumbuhan larva menjadi sangat penting dalam upaya penangkaran dan reintroduksi spesies ikan yang terancam punah. Salah satu di antara spesies yang mulai terancam adalah ikan elangi Arfak, Melanotaenia arfakensis yang sudah berada dalam kategori rentan dan informasinya masih sangat terbatas. Oleh karena itu, penelitian ini dilakukan dengan tujuan untuk mendeskripsikan aktivitas pemijahan, perkembangan awal, dan pertumbuhan larva spesies ikan elangi ini dalam kondisi laboratorium. Percobaan dalam skala laboratorium dilaksanakan pada bulan Maret-September 2017. Ikan yang digunakan berasal dari Sungai Nimbai. Sebanyak tiga pasang individu jantan dan betina dengan kisaran ukuran 46,5 sampai 60,1 mm dipilih untuk perlakuan. Namun, hanya satu pasangan yang berhasil diamati aktivitas pemijahannya secara lengkap. Pemijahan berlangsung di antara waktu pagi hari sampai siang hari dalam tiga periode pemijahan. Dalam setiap pe...
The research on feeding effectivity of Arfak rainbowfish conducted at Fisheries Laboratory, Faculty of Fishes and Marine Science, University of Papua in July to December 2016. The purpose of this research is to describe feeding... more
The research on feeding effectivity of Arfak rainbowfish conducted at Fisheries Laboratory, Faculty of Fishes and Marine Science, University of Papua in July to December 2016. The purpose of this research is to describe feeding effectivity of the fish at several levels of water turbidity. The fish samples used in the treatment, collected from Nimbai Stream, Prafi River system, Manokwari were acclimatized for a month in the laboratory. The fish were selected based on the body length and categorized into six size classes. Each individual of the fish was treated with 200 individuals of mosquito larvae (instar IV stage) at seven turbidity levels (2.54, 25.07, 50.52, 100.20, 500.60, and 800.40 Nephelometric Turbidity Unit, NTU) using particles with size of <63 m. Feeding effectivity was indicated by the level of predation in a period of 15 minutes. The results of the research showed that average level of predation did not differ among size classes at the low level of turbidity (50,52 NTU). The significant decrease in the average level of predation occurred at the higher level of turbidity (100,12 NTU) with the values range from 23.2% to 65.9%. This indicated a decrease in the feeding effectivity as the turbidity levels increase.
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Seven fish species from seven families are found during this study. The most common species found are Melanotaenia irianjaya (9/10 sites). No introduced species were found in any of the sites. Species richness ranged from 1-5 species per... more
Seven fish species from seven families are found during this study. The most common species found are Melanotaenia irianjaya (9/10 sites). No introduced species were found in any of the sites. Species richness ranged from 1-5 species per site and was highest in Aikrer Usem stream and Aisen stream. This difference between sites is partially attributed to position in order system and fishing effort. Higher order which is a combination of several creeks provided more diverse microhabitat than the lower ones, thus supporting higher fish diversity. A total of three species (42.9%) which endemic to southern Vogelkop Peninsular and northern Bomberai. Most of species are found including carnivorous, with diet consisted of aquatic and terrestrial insects, and the other benthic invertebrates. The presence of prey group is very closely related to the availability of riparian vegetation in the streams and creeks. Recommendations will include implementation of good forest management in the watershed to maintain the pattern of hydrology and water discharge in natural conditions, and also protection of riparian zones that exist as a source of energy for the stream ecosystem and as a buffer against an input from the terrestrial.
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Arfak rainbowfish, Melanotaenia arfakensis is an endemic fish on several river systems in the northeastern part of the Vogelkop peninsula. This study aims to describe the growth, age at first maturity, and sexual dimorphism of this... more
Arfak rainbowfish, Melanotaenia arfakensis is an endemic fish on several river systems in the northeastern part of the Vogelkop peninsula. This study aims to describe the growth, age at first maturity, and sexual dimorphism of this endemic fish on the Nimbai Stream and the Aimasi Stream, the Prafi River system. The fish were caught using handnet, then were measured their standard length and individual weight. Data were analyzed to estimated growth patterns, von Bertalanffy's growth rate, age at first maturity and sexual dimorphism characteristics. The results showed that male growth patterns varied, with a tendency of the increase in body length faster than that of body weight (negative allometric patterns) with b values ranging from 2.886 to 3.132. On the other hand, the female individuals had positive allometric patterns (b values ranged from 3.062 to 3.378). The growth rate (K) of male body length was faster (0.165-0.174) than that of female individuals (0.159-0.163). Male individuals reached the first maturity condition earlier (at age of 1.83-2.18 years) than female individuals (at age of 2.49-2.64 years). Sexual characteristics between the sexes are related to body height starting to appear when fish are of a standard length of larger than 18.22 mm or when male fish begin to approach the time of the first sexual maturity. Understanding of growth, age, and the characteristics of the sexual dimorphism of endemic fish has an important meaning in monitoring population conditions and for conservation efforts in their natural habitat.
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Benthos macroinvertebrates have been used as bioindicators to assess the waters quality of the stream, but still are very rarely to applied in West Papua streams. Benthos macroinvertebrates can describe the stream water quality so that... more
Benthos macroinvertebrates have been used as bioindicators to assess the waters quality of the stream, but still are very rarely to applied in West Papua streams. Benthos macroinvertebrates can describe the stream water quality so that very well be used as bioindicators, due to each species has a different tolerance to interference organic pollutants in waters. This study aimed to assess the water quality of Nimbai stream using benthos macroinvertebrates tolerance level and several water quality parameters. Data retrieval was conducted in June-July and September-October 2012 in seven stations (L1-L7) from Nimbai upstream to downstream that connected to Prafi river. The water macroinvertebrates were taken using surber with mesh size 200 μm and then was identified at the family level. At L5 station near the oil palm waste disposal installations was contains oil and fat (< 1-3 mg/l), which resulted in dissolved oxygen (DO) and pH is lower than the other stations. Similarly the value of H' is low (0.83), however, the value of C (0.79) was high that dominated by Oligochaeta. Famili biotic index (FBI) value obtained showed that water quality in the L1-L4 stations was in good to excellent condition, but the quality at L5 station is classified as very poor. As the distance far away from the sources of pollution in the L5 station, water quality tends to improve as shown in the L6 and L7 stations. The result of this study shows the important benefits of benthos macroinvertebrates as bioindicators for assessing the quality of stream waters, and can be described aquatic environments disturbance to the benthos macroinvertebrates habitats in Nimbai stream.
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The study aimed to describe the diversity and abundance of nocturnal larval and juvenile fish at Pami Estuary, Manokwari. Both of the stages were collected by triangular scoop nets with interval of three hours, starting from 18.00-06.00... more
The study aimed to describe the diversity and abundance of nocturnal larval and
juvenile fish at Pami Estuary, Manokwari. Both of the stages were collected by triangular scoop nets with interval of three hours, starting from 18.00-06.00 pm at new moon period during three months (September-November, 2010). Physicochemical parameters showed variation between all of two side the estuary and monthly. All of the larval and juvenile fishes consists of seven orders and 15 families, there are, Anguillidae, Congridae, Ophichthidae, Muraenidae, Elopidae, Mugilidae, Ambassidae, Carangidae, Gobiidae, Polynemidae, Siganidae, Terapontidae, Platycephalidae, Syngnathidae, and Diodontidae. The results showed monthly variation on diversity and highest abundance are found in October (0.061 individu m-2), especially for Anguillidae and Gobiidae that occurred at flood tide. The diversity showed low over these periods (H′ < 0,604). Lower diversity and dominated by few families showed that the community in the estuary Lower diversity and estuary is unstable, as a consequence of physiological difficulties encountered to tolerate drastic environmental changes. Although has fluctuating conditions, this area is an important role as habitat for feeding, spawning, nursering, and spawning migration route for several guilds of fish.
juvenile fish at Pami Estuary, Manokwari. Both of the stages were collected by triangular scoop nets with interval of three hours, starting from 18.00-06.00 pm at new moon period during three months (September-November, 2010). Physicochemical parameters showed variation between all of two side the estuary and monthly. All of the larval and juvenile fishes consists of seven orders and 15 families, there are, Anguillidae, Congridae, Ophichthidae, Muraenidae, Elopidae, Mugilidae, Ambassidae, Carangidae, Gobiidae, Polynemidae, Siganidae, Terapontidae, Platycephalidae, Syngnathidae, and Diodontidae. The results showed monthly variation on diversity and highest abundance are found in October (0.061 individu m-2), especially for Anguillidae and Gobiidae that occurred at flood tide. The diversity showed low over these periods (H′ < 0,604). Lower diversity and dominated by few families showed that the community in the estuary Lower diversity and estuary is unstable, as a consequence of physiological difficulties encountered to tolerate drastic environmental changes. Although has fluctuating conditions, this area is an important role as habitat for feeding, spawning, nursering, and spawning migration route for several guilds of fish.
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In order to investigate trophic interactions, diets of Arfak rainbowfish (M. arfakensis) and mosquitofish (G. affinis) were studied in the Nimbai Stream on May 2010. This study was performed to assess the niche breadth, to determine the... more
In order to investigate trophic interactions, diets of Arfak rainbowfish (M. arfakensis) and mosquitofish (G. affinis) were studied in the Nimbai Stream on May 2010. This study was performed to assess the niche breadth, to determine the degree of niche overlap, and feeding strategy of each species. The feeding niche breadth of the Arfak rainbowfish and mosquitofish are low, i.e. 0.100 and 0.199, respectively. The niche overlapping among two species are high (0.926). Both of two species have particular feeding strategy, with Formicidae as population specialization item, although Agromyzidae and Pisauridae as individual specialization items of two fishes. The presence of G. affinis as introduced fish with high niche breadth overlapping implied the competition interaction with M. arfakensis, also probably the others native fishes.
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Riparian vegetation has an important role in maintaining water stability, one of which is the river. This study aims to describe the structure of riparian vegetation so that its implications can be seen for the conditions of Arfak... more
Riparian vegetation has an important role in maintaining water stability, one of which is the river. This study aims to describe the structure of riparian vegetation so that its implications can be seen for the conditions of Arfak rainbowfish habitat on the Nimbai Stream. The study was conducted in three forest types, namely primary riparian forest, secondary riparian forest and open riparian forest. Sample collection of riparian vegetation was carried out by purposive sampling using sample plots. Plots measuring 2 mx 2 m are used to sample seedling and understorey growth, plots measuring 5 mx 5 m for growth at the stake level, while plots measuring 10 mx 10 m and 20 mx 20 m, for growth of pole and tree levels respectively. The identification results obtained a total of 35 species of understorey and 51 tree-level plants in all three types of riparian forests. Based on the analysis of vegetation structure, it is known that the condition of primary riparian forest and secondary riparian forest still relatively supports the life of Arfak rainbowfish compared to open riparian forest. Higher tree level density associated with canopy cover which has implications for the temperature of the water to be colder and less fluctuating, input larger litter into the food chain in the river, and hold suspended particles into the river. Also, the function of riparian vegetation in spawning activities, substrate attaching eggs and nursery habitat for Arfak rainbowfish larvae. The results of this study indicate the importance of riparian vegetation structure on the condition of rainbow Arfak rainbowfish habitat. An understanding of the structure of vegetation is also a basic information for efforts to rehabilitate this this endemic fish habitat to maintain the existence of a natural population.
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Trophic ecology of fish community at Nimbai Stream: Competition and predation interaction to Arfak rainbowfish, Melanotaenia arfakensisAllen, 1990 [Ekologi trofik komunitas ikan di Sungai Nimbai: interaksi kompetisi dan pemangsaan terhadap ikan pelangi arfak, Melanotaenia arfakensis Allen, 1990]more
Information on trophic ecology can provide an understanding of the functional role of fish in an ecosystem, including endemic and native fish groups, as well as alien fish that are introduced through anthropogenic activities. The research... more
Information on trophic ecology can provide an understanding of the functional role of fish in an ecosystem, including endemic and native fish groups, as well as alien fish that are introduced through anthropogenic activities. The research on the trophic ecology of the fish community in the Nimbai Stream, Prafi River system, is intended to describe the interaction of competition and predation, especially towards endemic fish, Melanotaenia arfakensis. Fish samples were collected monthly from four habitat types, i.e., slow littoral, medium littoral, pool, and run from May 2016 to April 2017. A combination of an electric shocker and a hand net was used to collect fish samples. A total of 16 fish species were collected, consists of one endemic species, namely M. arfakensis, nine species of native fish, and six species of alien fish. The Arfak rainbowfish and three native fish species were categorized as insectivorous, four native fish species as herbivorous, and two other fishes as carnivorous. Three alien fish species also belong to insectivorous, two alien fish species as carnivorous, and one species as herbivorous. The niche breadth of fish communities ranges from 0.071 to 0.857. The trophic niche overlap between the Arfak rainbowfish and three native fish species and three alien fish species was recorded. The results of this study indicate a potential competition and predation interactions between Arfak rainbowfish and native fish as well as with alien fish species. Therefore, introducing alien fish into Prafi River system will disrupt Arfak rainbowfish population.
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Arfak rainbowfish, Melanotaenia arfakensis, is one of the freshwater endemic fish in Manokwari, West Papua. The presence of the Arfak rainbowfish is currently experiencing many disturbances related to anthropogenic activities. This... more
Arfak rainbowfish, Melanotaenia arfakensis, is one of the freshwater endemic fish in Manokwari, West Papua. The presence of the Arfak rainbowfish is currently experiencing many disturbances related to anthropogenic activities. This research, therefore, was conducted to describe habitat condition, distribution and abundance of the Arfak rainbowfish in the Prafi River system spatially. This study was conducted for 12 months on 12 sites in Nimbai and Aimasi Streams, the Prafi River system. The results showed that this species was mainly distributed in the upper reaches of the Nimbai and the Aimasi streams based on the frequency of occurrence (>90.9%) and relative abundance (³25.5%). The lower fish occurrence and abundance was found at site of the sewerage and downstream. The highest value of the habitat utilization overlap index between Arfak rainbowfish and alien fish species was found in lower reaches. Decreasing habitat quality in lower reaches of the river causes limited distribution and decline in abundance of this species. To conserve this endemic fish population, it is necessary to maintain habitat condition in the upstream area and restore the damaged habitat in lower reaches of the Prafi River system.
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Buyan and Tamblingan lakes were often mentioned as twin lake because of its adjacent location. These two lakes were separated by approximately one-kilometer forest. Studies which recorded the fish species in those lakes were very limited... more
Buyan and Tamblingan lakes were often mentioned as twin lake because of its adjacent location. These two lakes were separated by approximately one-kilometer forest. Studies which recorded the fish species in those lakes were very limited so that a study was needed regarding that conditions as the initial step of management. This study aims to reveal and analyze the ratio of native and alien fish species which were found in Buyan and Tamblingan lakes, Bali. The fish sampling was held three times in different months at Buyan and Tamblingan lakes during 2017-2018, using a purposive sampling method. There were six locations sampling fish on each lake. It used experimental gill net with mesh size 0.5; 1.0; 1.5; 2.0; 2.5; 3.0; 3.5; 4.0 inches and trap. Three of the nine species that found in Buyan and Tamblingan lakes were native fish species. The ratio of native and non-indigenous fish caught in Buyan lake was bigger than from Tamblingan lake. Based on the length size of the most captured fish, the native fish of Osteochilus vittatus in Buyan lake was longer than Tamblingan, while the non-indigenous one, Poecillia reticulata had the same length size on the two lakes.
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Research on the potency of Arfak rainbowfish as a biocontrol of mosquito larvae was held in Fisheries Laboratory FPPIK, the Universitas Negeri Papua from August to November 2013. The aim of this study was to describe the potency of Arfak... more
Research on the potency of Arfak rainbowfish as a biocontrol of mosquito larvae was held in Fisheries Laboratory FPPIK, the Universitas Negeri Papua from August to November 2013. The aim of this study was to describe the potency of Arfak rainbowfish as a biocontrol of mosquito larvae and compared it with two introduction fish species, Gambusia affinis and Aplocehilus panchax. All of the three species collected from Prafi River, Manokwari were acclimatized for one month in the laboratory. Male individuals were selected and grouped into four size classes according to body length. Three individuals were chosen to represent each species in each size class. Each individual was treated with mosquito larvae (stage IV instars and pupae) of 100 individuals separately, as well as 50 individual instars and pupae simultaneously. The level of predation and selectivity of both prey types was recorded, within 15-minute observation period. All of the three species showed levels of predation on instars and pupae increased with increasing body size. The level of predation on instars was higher than the pupae when the two treatment preys were treated separately. Furthermore, the predation level of Arfak rainbowfish on instars and pupae higher than the other two fish species in all size classes, and also the relative degree of selectivity did not differ between the two types of prey in each size class. These results as well as other criteria, indicates M. arfakensis has potential as a biocontrol agent to mosquito larvae.
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This study aims to describe the food habits of scads (Selar boops, Selar crumenophthalmus, Selar leptolepis) that caught in the coastal waters of Manokwari. Samplings were carried out every week for a month between May-June 2010, using... more
This study aims to describe the food habits of scads (Selar boops, Selar crumenophthalmus, Selar leptolepis) that caught in the coastal waters of Manokwari. Samplings were carried out every week for a month between May-June 2010, using liftnet. Results showed that food composition of the all three species of scads consisting of fish larvae and juveniles, planktonic crustacean, mollusc larvae, sipuncules, and unidentified fraction that suspected as zooplankton and fish fractions. Large value of preponderance index showed variation between sampling times, that mostly dominated by three diets groups (crustacean, unidentified fraction, and fish). Variation of this index value was also showed by size class of three scads, i.e., shift of domination diet from crustacean at small size to piscivorous for larger size of scads. Morphology of digestive organ, including gill rakers that composed of comb-like, stomach shape, shorter intestine length compared to body length that more empasize of all three scads species are carnivorous, especially zooplanktivorous and piscivorous.