Jellyfish can adversely affect commercial fisheries by clogging nets, by feeding on the young age... more Jellyfish can adversely affect commercial fisheries by clogging nets, by feeding on the young age-classes of fish. Jellyfish baycatch data with different fishing gears, purse seiner, trawl and gillnet&trammel net, were investigated in the Iskenderun, Mersin and Antalya Bays, the Eastern Mediterranean coast of the Turkey. Only Rhopilema nomadica Galil, 1990 was observed in all fishing gears for the three study areas. R. nomadica comprised 49% (1237.7 kg) of the total catch (2534.685 kg.) at trawling for Northeastern Mediterranean Sea. R. nomadica represents 62% of the total catch of purse seine in Northeastern Mediterranean Sea. R. nomadica comprised 37% (150,5kg) of the total catch (408,814 kg) at gillnet&trammel net for Northeastern Mediterranean Sea. In general R. nomadica represent 60% (18388,2 kg) of the total catch (30489,87 kg.) for all fishing gears in the eastern Mediterranean coast of Turkey during March-April 2011.
Stock structure analysis of anchovy from the Rovinj, Maslenica and Island of Korculain in the Adr... more Stock structure analysis of anchovy from the Rovinj, Maslenica and Island of Korculain in the Adriatic Sea was carried out by using 13 microsatellite loci. Overall, 259 alleles were detected in 13 loci, the number of alleles per locus and population ranged from 4 to 28. The allelic richness of overall loci was found to be highest in the Rovinj population and lowest in the Island of Korcula population. The highest and lowest value of population specific alleles was found in the Rovinj population and Island of Korcula population, respectively. Observed heterozygosity per population was ranged from 0.714 (Rovinj) to 0.678 (Maslenica). Pairwise FST values revealed that there is no significant genetic differences between populations (P>0.05). However, the highest and lowest genetic distance were found between the Rovinj and Maslenica populations (FST=0.00626) and between the Island of Korcula and Maslenica populations, respectively. The UPGMA dendrogram clustered the Maslenica and Isl...
In this study, different sized regions of interest were obtained from fish images and these were ... more In this study, different sized regions of interest were obtained from fish images and these were used for fish species classification. A previously proposed region of interest obtaining method was upgraded in order to acquire wider regions of interest. Depending on general accuracies of classification performances, comparison between these regions of interest was made. According to comparison results the effects of the different sized regions of interest were discussed for classification purposes of fish species. This study was performed by using a database which consists of 1321 fish images. These fish images include fish samples from 16 fish families and 35 fish species. All images were colored in RGB color space. But two different feature sets were extracted for fishes by examining images both in RGB and HSV color spaces. Feature extraction was performed by using a color based method. For each color space, seven statistical features were extracted from each component of the color...
In this project, it is aimed to determine population genetic structure of grouper species belongi... more In this project, it is aimed to determine population genetic structure of grouper species belonging to Ephinephelus, Hyporthodus and Mycteroperca genera distributed in the Aegean and Mediterranean Seas with sequence analysis of mitochondrial DNA (mtDNA) gene. With the population genetic analysis of grouper species we elucidate whether there are enough migration or gen flow among populations which lead to one panmictic populations, or there are partial genetic isolation among populations which lead to genetically different local populations. It is also aimed to reveal results of the negative effect of overfishing and other environmental factors on genetic structure of the species, and determine preferential populations and species for conservation. Grouper species distributed in the Mediterranean and Aegean Seas are represented with 6 species (Epinephelus aeneus, E. caninus, E. costae, E. marginatus, Hyporthodus haifensis, Mycteroperca rubra) in Turkish marine waters. Fishing tonnage...
Sea temperature change in the Mediterranean, Marmara and Black Sea coasts of Turkey and its biodi... more Sea temperature change in the Mediterranean, Marmara and Black Sea coasts of Turkey and its biodiversity effects are investigated. The surface sea water temperatures of the Mediterranean, Marmara and Black Sea region of Turkey for last 41 years showed increased trends in Mediterranean Sea (Iskenderun, Mersin and Antalya), Marmara Sea (Istanbul) and Black Sea (Samsun). The number of Indo-Pacific species is getting rapidly increased for the last decade that caused increased invasion of the Indo-Pacific species and significant shift of biodiversity in Turkish Seas. This settlement process is probably accelerated or facilitated by global climate change and overfishing of native species. Nowadays, the occurrence of Atlantic-Mediterranean (Lithognathus mormyrus, Serranus hepatus and Callinectes sapidus) and Indo-Pacific (Stephanolepis diaspros, Lagocephalus spadiceus) originated species in the Marmara and Black Seas can also be an important indicator of the process of Mediterranization of...
Systematic relationships among four genera and nine species (Mugil cephalus Linnaeus, 1758, Mugil... more Systematic relationships among four genera and nine species (Mugil cephalus Linnaeus, 1758, Mugil soiuy Basilewsky, 1855, Liza ramada (Risso, 1827), Liza aurata (Risso, 1810), Liza abu (Heckel, 1843), Liza saliens (Risso, 1810), Liza carinata (Valenciennes, 1836), Chelon labrosus (Risso, 1827), Oedalechilus labeo (Cuvier, 1829)) of the Mugilidae family living in the Mediterranean Sea were investigated using morphological characters. Moreover the systematic relationship of M. soiuy and L. abu among other mullet species was investigated in the present study for the first time. Hierarchical cluster analyses of morphometric data were not concordant with the meristic data. Meristic characters in the present study were more discriminative than morphometric characters in terms of taxonomic classification of the mullets. According to meristic data in UPGMA tree, all nine species were grouped in two main branching. In the first branch, C. labrosus and O. labeo were clustered as closest taxa,...
Two morphologically similar lionfish species Pterois miles and P. volitans (Scorpaenidae), report... more Two morphologically similar lionfish species Pterois miles and P. volitans (Scorpaenidae), reported in Turkish marine waters, were assess using partial mitochondrial cytochrome c oxidase I (COI) gene. As a result of sequence alignment, 609 bp of COI region were examined and it was contained 81 bp variable and 528 conservative sites of which 47 bp parsimony informative sites. Mean genetic diversity and genetic divergence between species was 0.009481 and 0.047660, respectively. 16 different haplotypes were detected in total 18 sequences, and there were no shared haplotypes between the two lionfish species. According to neighbor joining and maximum parsimony trees, P. miles and P. volitans were clustered in different clades.
Population structure of Atlantic Bonito Sarda sarda in the Mediterranean Sea and possible pathway... more Population structure of Atlantic Bonito Sarda sarda in the Mediterranean Sea and possible pathway of migration for spawning and feeding was discussed on the bases of genetic and morphological dataset. The effects of topographic and hydrographic factors on the connectivity and migration pattern of Atlantic Bonito in Turkish, Bulgarian and Croatian marine waters and fishery management implications of putative stocks were correspondingly referred.
Objective: Otoliths contain specific characteristics of stock so are considered as a good subject... more Objective: Otoliths contain specific characteristics of stock so are considered as a good subject for morphometric analysis. Otoliths contain finite extent of individual variability in growth, relative to variability in somatic growth. Therefore, the aim of study is developed a tools for automatically analysis otolith image of six grouper species. Using image analysis methods, otolith shape analysis tools are developed. There are five main steps in image analysis methods of tool which are data acquisition, pre-processing, segmentation, marking landmarks and reporting. As a result, in this study it is aimed to develop a computer package program to facilitate shape analyses of otolith of fish, populations and species of grouper. The application can be used to get independent measurements on otolith shape, on the other hand in this study, four landmarks are determined for constructing network system. The program is automatically determines these landmarks by using image processing tech...
The progress on species distribution modelling (SDM) methods has brought new insights into the fi... more The progress on species distribution modelling (SDM) methods has brought new insights into the field of biological invasion management. In particular, statistical niche modelling, for spatio-temporal predictions of marine species’ distribution, is an increasingly used tool, supporting efficient decision-making for prevention and conservation. Earth's climate has changed significantly in the last century and the number of alien species penetrating from Indo-Pacific Ocean and South part of the Atlantic in the Mediterranean will continue to increase over the next decades. The purpose of the present study was to predict the potential geographic distribution and expansion of invasive alien lionfish (Pterois miles and Pterois volitans) with ecological niche modelling along the Mediterranean Sea. Temporal and spatial occurrence data from the first occurrence of a species for each country with coast along the Mediterranean Sea, was used to develop robust predictions of species richness,...
Jellyfish can adversely affect commercial fisheries by clogging nets, by feeding on the young age... more Jellyfish can adversely affect commercial fisheries by clogging nets, by feeding on the young age-classes of fish. Jellyfish baycatch data with different fishing gears, purse seiner, trawl and gillnet&trammel net, were investigated in the Iskenderun, Mersin and Antalya Bays, the Eastern Mediterranean coast of the Turkey. Only Rhopilema nomadica Galil, 1990 was observed in all fishing gears for the three study areas. R. nomadica comprised 49% (1237.7 kg) of the total catch (2534.685 kg.) at trawling for Northeastern Mediterranean Sea. R. nomadica represents 62% of the total catch of purse seine in Northeastern Mediterranean Sea. R. nomadica comprised 37% (150,5kg) of the total catch (408,814 kg) at gillnet&trammel net for Northeastern Mediterranean Sea. In general R. nomadica represent 60% (18388,2 kg) of the total catch (30489,87 kg.) for all fishing gears in the eastern Mediterranean coast of Turkey during March-April 2011.
Stock structure analysis of anchovy from the Rovinj, Maslenica and Island of Korculain in the Adr... more Stock structure analysis of anchovy from the Rovinj, Maslenica and Island of Korculain in the Adriatic Sea was carried out by using 13 microsatellite loci. Overall, 259 alleles were detected in 13 loci, the number of alleles per locus and population ranged from 4 to 28. The allelic richness of overall loci was found to be highest in the Rovinj population and lowest in the Island of Korcula population. The highest and lowest value of population specific alleles was found in the Rovinj population and Island of Korcula population, respectively. Observed heterozygosity per population was ranged from 0.714 (Rovinj) to 0.678 (Maslenica). Pairwise FST values revealed that there is no significant genetic differences between populations (P>0.05). However, the highest and lowest genetic distance were found between the Rovinj and Maslenica populations (FST=0.00626) and between the Island of Korcula and Maslenica populations, respectively. The UPGMA dendrogram clustered the Maslenica and Isl...
In this study, different sized regions of interest were obtained from fish images and these were ... more In this study, different sized regions of interest were obtained from fish images and these were used for fish species classification. A previously proposed region of interest obtaining method was upgraded in order to acquire wider regions of interest. Depending on general accuracies of classification performances, comparison between these regions of interest was made. According to comparison results the effects of the different sized regions of interest were discussed for classification purposes of fish species. This study was performed by using a database which consists of 1321 fish images. These fish images include fish samples from 16 fish families and 35 fish species. All images were colored in RGB color space. But two different feature sets were extracted for fishes by examining images both in RGB and HSV color spaces. Feature extraction was performed by using a color based method. For each color space, seven statistical features were extracted from each component of the color...
In this project, it is aimed to determine population genetic structure of grouper species belongi... more In this project, it is aimed to determine population genetic structure of grouper species belonging to Ephinephelus, Hyporthodus and Mycteroperca genera distributed in the Aegean and Mediterranean Seas with sequence analysis of mitochondrial DNA (mtDNA) gene. With the population genetic analysis of grouper species we elucidate whether there are enough migration or gen flow among populations which lead to one panmictic populations, or there are partial genetic isolation among populations which lead to genetically different local populations. It is also aimed to reveal results of the negative effect of overfishing and other environmental factors on genetic structure of the species, and determine preferential populations and species for conservation. Grouper species distributed in the Mediterranean and Aegean Seas are represented with 6 species (Epinephelus aeneus, E. caninus, E. costae, E. marginatus, Hyporthodus haifensis, Mycteroperca rubra) in Turkish marine waters. Fishing tonnage...
Sea temperature change in the Mediterranean, Marmara and Black Sea coasts of Turkey and its biodi... more Sea temperature change in the Mediterranean, Marmara and Black Sea coasts of Turkey and its biodiversity effects are investigated. The surface sea water temperatures of the Mediterranean, Marmara and Black Sea region of Turkey for last 41 years showed increased trends in Mediterranean Sea (Iskenderun, Mersin and Antalya), Marmara Sea (Istanbul) and Black Sea (Samsun). The number of Indo-Pacific species is getting rapidly increased for the last decade that caused increased invasion of the Indo-Pacific species and significant shift of biodiversity in Turkish Seas. This settlement process is probably accelerated or facilitated by global climate change and overfishing of native species. Nowadays, the occurrence of Atlantic-Mediterranean (Lithognathus mormyrus, Serranus hepatus and Callinectes sapidus) and Indo-Pacific (Stephanolepis diaspros, Lagocephalus spadiceus) originated species in the Marmara and Black Seas can also be an important indicator of the process of Mediterranization of...
Systematic relationships among four genera and nine species (Mugil cephalus Linnaeus, 1758, Mugil... more Systematic relationships among four genera and nine species (Mugil cephalus Linnaeus, 1758, Mugil soiuy Basilewsky, 1855, Liza ramada (Risso, 1827), Liza aurata (Risso, 1810), Liza abu (Heckel, 1843), Liza saliens (Risso, 1810), Liza carinata (Valenciennes, 1836), Chelon labrosus (Risso, 1827), Oedalechilus labeo (Cuvier, 1829)) of the Mugilidae family living in the Mediterranean Sea were investigated using morphological characters. Moreover the systematic relationship of M. soiuy and L. abu among other mullet species was investigated in the present study for the first time. Hierarchical cluster analyses of morphometric data were not concordant with the meristic data. Meristic characters in the present study were more discriminative than morphometric characters in terms of taxonomic classification of the mullets. According to meristic data in UPGMA tree, all nine species were grouped in two main branching. In the first branch, C. labrosus and O. labeo were clustered as closest taxa,...
Two morphologically similar lionfish species Pterois miles and P. volitans (Scorpaenidae), report... more Two morphologically similar lionfish species Pterois miles and P. volitans (Scorpaenidae), reported in Turkish marine waters, were assess using partial mitochondrial cytochrome c oxidase I (COI) gene. As a result of sequence alignment, 609 bp of COI region were examined and it was contained 81 bp variable and 528 conservative sites of which 47 bp parsimony informative sites. Mean genetic diversity and genetic divergence between species was 0.009481 and 0.047660, respectively. 16 different haplotypes were detected in total 18 sequences, and there were no shared haplotypes between the two lionfish species. According to neighbor joining and maximum parsimony trees, P. miles and P. volitans were clustered in different clades.
Population structure of Atlantic Bonito Sarda sarda in the Mediterranean Sea and possible pathway... more Population structure of Atlantic Bonito Sarda sarda in the Mediterranean Sea and possible pathway of migration for spawning and feeding was discussed on the bases of genetic and morphological dataset. The effects of topographic and hydrographic factors on the connectivity and migration pattern of Atlantic Bonito in Turkish, Bulgarian and Croatian marine waters and fishery management implications of putative stocks were correspondingly referred.
Objective: Otoliths contain specific characteristics of stock so are considered as a good subject... more Objective: Otoliths contain specific characteristics of stock so are considered as a good subject for morphometric analysis. Otoliths contain finite extent of individual variability in growth, relative to variability in somatic growth. Therefore, the aim of study is developed a tools for automatically analysis otolith image of six grouper species. Using image analysis methods, otolith shape analysis tools are developed. There are five main steps in image analysis methods of tool which are data acquisition, pre-processing, segmentation, marking landmarks and reporting. As a result, in this study it is aimed to develop a computer package program to facilitate shape analyses of otolith of fish, populations and species of grouper. The application can be used to get independent measurements on otolith shape, on the other hand in this study, four landmarks are determined for constructing network system. The program is automatically determines these landmarks by using image processing tech...
The progress on species distribution modelling (SDM) methods has brought new insights into the fi... more The progress on species distribution modelling (SDM) methods has brought new insights into the field of biological invasion management. In particular, statistical niche modelling, for spatio-temporal predictions of marine species’ distribution, is an increasingly used tool, supporting efficient decision-making for prevention and conservation. Earth's climate has changed significantly in the last century and the number of alien species penetrating from Indo-Pacific Ocean and South part of the Atlantic in the Mediterranean will continue to increase over the next decades. The purpose of the present study was to predict the potential geographic distribution and expansion of invasive alien lionfish (Pterois miles and Pterois volitans) with ecological niche modelling along the Mediterranean Sea. Temporal and spatial occurrence data from the first occurrence of a species for each country with coast along the Mediterranean Sea, was used to develop robust predictions of species richness,...
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