The Collective Article ‘New Mediterranean Biodiversity Records’ of the Mediterranean Marine Scien... more The Collective Article ‘New Mediterranean Biodiversity Records’ of the Mediterranean Marine Science journal offers the means to publish biodiversity records in the Mediterranean Sea. The current article is divided in two parts, for records of native and alien species respectively. The new records of native fish species include: the slender sunfish Ranzania laevis and the scalloped ribbonfish Zu cristatus in Calabria; the Azores rockling Gaidropsarus granti in Calabria and Sicily; the agujon needlefish Tylosurus acus imperialis in the Northern Aegean; and the amphibious behaviour of Gouania willdenowi in Southern Turkey. As regards molluscs, the interesting findings include Ischnochiton usticensis in Calabria and Thordisa filix in the bay of Piran (Slovenia). The stomatopod Parasquilla ferussaci was collected from Lesvos island (Greece); the isopod Anilocra frontalis was observed parasitizing the alien Pteragogus trispilus in the Rhodes area. The asteroid Tethyaster subinermis and th...
This article aimed to assess the species composition, seasonal distribution, length–weight relati... more This article aimed to assess the species composition, seasonal distribution, length–weight relationships (LWRs); age composition and the non-indigenous species (Lessepsian species) of the non-target catch obtained by commercial bottom trawlers operated between Al Agamy and Abu Qir (west and east off Alexandria, Egypt). A total of 44 economic species and 45 non-economic species were recorded forming 51.2 % and 48.8 %, respectively of the total examined catch weight during the whole year 2014. The high diversity indices were recorded in spring and summer for economic species. The recruits of nine mostly important economic species in the region were recorded. Four species namely: Spicara maena; Pagellus acarne; Trachurus picturatus and Nemipterus japonicus had lengths between 8.5 and 10.9 cm appeared in spring while other five species namely: Pagellus erythrinus; Boops boops; Serranus hepatus; Spicara smaris and Mullus barbatus had lengths ranged between 7.00 and 11.00 cm appeared in summer. The exponent “b” of the length–weight relationship for 22 species varied between 2.1316 and 3.2415 for economic species and ranged between 2.6341 and 3.4406 for non-economic species. Age analysis showed that the life span of the majority of economic species is two years. The number of Lessepsian species recorded in this area was 22 species of which eleven were economic.
Sillago suezensis (GOLANI; FRICKE and TIKOCHINSKI, 2014) samples were collected during September ... more Sillago suezensis (GOLANI; FRICKE and TIKOCHINSKI, 2014) samples were collected during September and November 2013 from bottom trawlers operated off Port Said (Egyptian Mediterranean waters). It was evident that 87 specimens recorded had lengths between 12.0cm and 19.0cm with an average of 14.2cm while three specimens (recruits) with average length 7.0cm were recorded during November. Lengthweight relationship showed negative allometric growth and condition factor varied between 0.877 for smaller size (12.0cm) and 0.642 for large size fishes (19.0cm). Age composition of this species revealed the presence of two age groups during September: age group one with mean length 13.62cm and age group two with average length 17.01cm. The sex ratio of males to females was 0.85: 1 however; males dominated the catch at length ranged between 12.0cm and 16.0cm but females dominated the catch at larger sizes between 17.0cm and 19.0cm. The maturity stages of males and females showed that both sexes ...
• The high diversity indices were recorded in spring and summer. • A high percentage of recruits ... more • The high diversity indices were recorded in spring and summer. • A high percentage of recruits were captured before reaching their ripening stages. • 22 Lessepsian species out of 89 collected ones were recorded. • The authors propose simple anterior trawl changes in cod end mesh size from 2.5 to 4.0 cm. a b s t r a c t This article aimed to assess the species composition, seasonal distribution, length–weight relationships (LWRs); age composition and the non-indigenous species (Lessepsian species) of the non-target catch obtained by commercial bottom trawlers operated between Al Agamy and Abu Qir (west and east off Alexandria, Egypt). A total of 44 economic species and 45 non-economic species were recorded forming 51.2 % and 48.8 %, respectively of the total examined catch weight during the whole year 2014. The high diversity indices were recorded in spring and summer for economic species. The recruits of nine mostly important economic species in the region were recorded. Four species namely: Spicara maena; Pagellus acarne; Trachurus picturatus and Nemipterus japonicus had lengths between 8.5 and 10.9 cm appeared in spring while other five species namely: Pagellus erythrinus; Boops boops; Serranus hepatus; Spicara smaris and Mullus barbatus had lengths ranged between 7.00 and 11.00 cm appeared in summer. The exponent ''b'' of the length–weight relationship for 22 species varied between 2.1316 and 3.2415 for economic species and ranged between 2.6341 and 3.4406 for non-economic species. Age analysis showed that the life span of the majority of economic species is two years. The number of Lessepsian species recorded in this area was 22 species of which eleven were economic.
Sillago suezensis (GOLANI; FRICKE and TIKOCHINSKI, 2014) samples were collected during September ... more Sillago suezensis (GOLANI; FRICKE and TIKOCHINSKI, 2014) samples were collected during September and November 2013 from bottom trawlers operated off Port Said (Egyptian Mediterranean waters). It was evident that 87 specimens recorded had lengths between 12.0cm and 19.0cm with an average of 14.2cm while three specimens (recruits) with average length 7.0cm were recorded during November. Length-weight relationship showed negative allometric growth and condition factor varied between 0.877 for smaller size (12.0cm) and 0.642 for large size fishes (19.0cm). Age composition of this species revealed the presence of two age groups during September: age group one with mean length 13.62cm and age group two with average length 17.01cm. The sex ratio of males to females was 0.85: 1 however; males dominated the catch at length ranged between 12.0cm and 16.0cm but females dominated the catch at larger sizes between 17.0cm and 19.0cm. The maturity stages of males and females showed that both sexes were ripe during September and the appearance of recruits in November declared that this species nearly spawn during summer. The potential impacts of the economic Erythrean species in the Egyptian Mediterranean fisheries exhibit desirable consequences.
In the present study, the catch of beach seine operating in the Eastern Harbor of Alexandria (Egy... more In the present study, the catch of beach seine operating in the Eastern Harbor of Alexandria (Egypt) during the fishing season of 2009 was investigated. Fishing is allowed all year except for some weeks in the winter. Catch efficiency was estimated to be 37.94 kg/haul and catch rate was 25.29 kg/h. The catch was classified into economic (60.24%) and non-economic (39.76%) species. The total number of species caught in the Eastern Harbor was 46 species (31 economic, 15 non-economic) belonging to 31 families (16 economic, 15 non-economic). The economic category of species was dominated by the immigrant sardine species Herklotsichthys punctatus while the non-economic category was dominated by Engraulis encrasicolus. Eight species were lessepsian. In terms of abundance, seven species were recorded during four seasons, seven species occurred in three seasons ; ten species were found in two seasons while the rest occurred in one season only. Species compositions , size composition, the length-weight relationships as well as age composition for some dominant species were investigated. Fishing in sheltered places or nursery grounds with small meshed nets (0.5 cm) causes drastic danger to the fish populations of the Eastern Harbor.
• The high diversity indices were recorded in spring and summer. • A high percentage of recruits ... more • The high diversity indices were recorded in spring and summer. • A high percentage of recruits were captured before reaching their ripening stages. • 22 Lessepsian species out of 89 collected ones were recorded. • The authors propose simple anterior trawl changes in cod end mesh size from 2.5 to 4.0 cm. a b s t r a c t This article aimed to assess the species composition, seasonal distribution, length–weight relationships (LWRs); age composition and the non-indigenous species (Lessepsian species) of the non-target catch obtained by commercial bottom trawlers operated between Al Agamy and Abu Qir (west and east off Alexandria, Egypt). A total of 44 economic species and 45 non-economic species were recorded forming 51.2 % and 48.8 %, respectively of the total examined catch weight during the whole year 2014. The high diversity indices were recorded in spring and summer for economic species. The recruits of nine mostly important economic species in the region were recorded. Four species namely: Spicara maena; Pagellus acarne; Trachurus picturatus and Nemipterus japonicus had lengths between 8.5 and 10.9 cm appeared in spring while other five species namely: Pagellus erythrinus; Boops boops; Serranus hepatus; Spicara smaris and Mullus barbatus had lengths ranged between 7.00 and 11.00 cm appeared in summer. The exponent ''b'' of the length–weight relationship for 22 species varied between 2.1316 and 3.2415 for economic species and ranged between 2.6341 and 3.4406 for non-economic species. Age analysis showed that the life span of the majority of economic species is two years. The number of Lessepsian species recorded in this area was 22 species of which eleven were economic.
Sillago suezensis (GOLANI; FRICKE and TIKOCHINSKI, 2014) samples were collected during September ... more Sillago suezensis (GOLANI; FRICKE and TIKOCHINSKI, 2014) samples were collected during September and November 2013 from bottom trawlers operated off Port Said (Egyptian Mediterranean waters). It was evident that 87 specimens recorded had lengths between 12.0cm and 19.0cm with an average of 14.2cm while three specimens (recruits) with average length 7.0cm were recorded during November. Length-weight relationship showed negative allometric growth and condition factor varied between 0.877 for smaller size (12.0cm) and 0.642 for large size fishes (19.0cm). Age composition of this species revealed the presence of two age groups during September: age group one with mean length 13.62cm and age group two with average length 17.01cm. The sex ratio of males to females was 0.85: 1 however; males dominated the catch at length ranged between 12.0cm and 16.0cm but females dominated the catch at larger sizes between 17.0cm and 19.0cm. The maturity stages of males and females showed that both sexes were ripe during September and the appearance of recruits in November declared that this species nearly spawn during summer. The potential impacts of the economic Erythrean species in the Egyptian Mediterranean fisheries exhibit desirable consequences.
The Collective Article ‘New Mediterranean Biodiversity Records’ of the Mediterranean Marine Scien... more The Collective Article ‘New Mediterranean Biodiversity Records’ of the Mediterranean Marine Science journal offers the means to publish biodiversity records in the Mediterranean Sea. The current article is divided in two parts, for records of native and alien species respectively. The new records of native fish species include: the slender sunfish Ranzania laevis and the scalloped ribbonfish Zu cristatus in Calabria; the Azores rockling Gaidropsarus granti in Calabria and Sicily; the agujon needlefish Tylosurus acus imperialis in the Northern Aegean; and the amphibious behaviour of Gouania willdenowi in Southern Turkey. As regards molluscs, the interesting findings include Ischnochiton usticensis in Calabria and Thordisa filix in the bay of Piran (Slovenia). The stomatopod Parasquilla ferussaci was collected from Lesvos island (Greece); the isopod Anilocra frontalis was observed parasitizing the alien Pteragogus trispilus in the Rhodes area. The asteroid Tethyaster subinermis and th...
This article aimed to assess the species composition, seasonal distribution, length–weight relati... more This article aimed to assess the species composition, seasonal distribution, length–weight relationships (LWRs); age composition and the non-indigenous species (Lessepsian species) of the non-target catch obtained by commercial bottom trawlers operated between Al Agamy and Abu Qir (west and east off Alexandria, Egypt). A total of 44 economic species and 45 non-economic species were recorded forming 51.2 % and 48.8 %, respectively of the total examined catch weight during the whole year 2014. The high diversity indices were recorded in spring and summer for economic species. The recruits of nine mostly important economic species in the region were recorded. Four species namely: Spicara maena; Pagellus acarne; Trachurus picturatus and Nemipterus japonicus had lengths between 8.5 and 10.9 cm appeared in spring while other five species namely: Pagellus erythrinus; Boops boops; Serranus hepatus; Spicara smaris and Mullus barbatus had lengths ranged between 7.00 and 11.00 cm appeared in summer. The exponent “b” of the length–weight relationship for 22 species varied between 2.1316 and 3.2415 for economic species and ranged between 2.6341 and 3.4406 for non-economic species. Age analysis showed that the life span of the majority of economic species is two years. The number of Lessepsian species recorded in this area was 22 species of which eleven were economic.
Sillago suezensis (GOLANI; FRICKE and TIKOCHINSKI, 2014) samples were collected during September ... more Sillago suezensis (GOLANI; FRICKE and TIKOCHINSKI, 2014) samples were collected during September and November 2013 from bottom trawlers operated off Port Said (Egyptian Mediterranean waters). It was evident that 87 specimens recorded had lengths between 12.0cm and 19.0cm with an average of 14.2cm while three specimens (recruits) with average length 7.0cm were recorded during November. Lengthweight relationship showed negative allometric growth and condition factor varied between 0.877 for smaller size (12.0cm) and 0.642 for large size fishes (19.0cm). Age composition of this species revealed the presence of two age groups during September: age group one with mean length 13.62cm and age group two with average length 17.01cm. The sex ratio of males to females was 0.85: 1 however; males dominated the catch at length ranged between 12.0cm and 16.0cm but females dominated the catch at larger sizes between 17.0cm and 19.0cm. The maturity stages of males and females showed that both sexes ...
• The high diversity indices were recorded in spring and summer. • A high percentage of recruits ... more • The high diversity indices were recorded in spring and summer. • A high percentage of recruits were captured before reaching their ripening stages. • 22 Lessepsian species out of 89 collected ones were recorded. • The authors propose simple anterior trawl changes in cod end mesh size from 2.5 to 4.0 cm. a b s t r a c t This article aimed to assess the species composition, seasonal distribution, length–weight relationships (LWRs); age composition and the non-indigenous species (Lessepsian species) of the non-target catch obtained by commercial bottom trawlers operated between Al Agamy and Abu Qir (west and east off Alexandria, Egypt). A total of 44 economic species and 45 non-economic species were recorded forming 51.2 % and 48.8 %, respectively of the total examined catch weight during the whole year 2014. The high diversity indices were recorded in spring and summer for economic species. The recruits of nine mostly important economic species in the region were recorded. Four species namely: Spicara maena; Pagellus acarne; Trachurus picturatus and Nemipterus japonicus had lengths between 8.5 and 10.9 cm appeared in spring while other five species namely: Pagellus erythrinus; Boops boops; Serranus hepatus; Spicara smaris and Mullus barbatus had lengths ranged between 7.00 and 11.00 cm appeared in summer. The exponent ''b'' of the length–weight relationship for 22 species varied between 2.1316 and 3.2415 for economic species and ranged between 2.6341 and 3.4406 for non-economic species. Age analysis showed that the life span of the majority of economic species is two years. The number of Lessepsian species recorded in this area was 22 species of which eleven were economic.
Sillago suezensis (GOLANI; FRICKE and TIKOCHINSKI, 2014) samples were collected during September ... more Sillago suezensis (GOLANI; FRICKE and TIKOCHINSKI, 2014) samples were collected during September and November 2013 from bottom trawlers operated off Port Said (Egyptian Mediterranean waters). It was evident that 87 specimens recorded had lengths between 12.0cm and 19.0cm with an average of 14.2cm while three specimens (recruits) with average length 7.0cm were recorded during November. Length-weight relationship showed negative allometric growth and condition factor varied between 0.877 for smaller size (12.0cm) and 0.642 for large size fishes (19.0cm). Age composition of this species revealed the presence of two age groups during September: age group one with mean length 13.62cm and age group two with average length 17.01cm. The sex ratio of males to females was 0.85: 1 however; males dominated the catch at length ranged between 12.0cm and 16.0cm but females dominated the catch at larger sizes between 17.0cm and 19.0cm. The maturity stages of males and females showed that both sexes were ripe during September and the appearance of recruits in November declared that this species nearly spawn during summer. The potential impacts of the economic Erythrean species in the Egyptian Mediterranean fisheries exhibit desirable consequences.
In the present study, the catch of beach seine operating in the Eastern Harbor of Alexandria (Egy... more In the present study, the catch of beach seine operating in the Eastern Harbor of Alexandria (Egypt) during the fishing season of 2009 was investigated. Fishing is allowed all year except for some weeks in the winter. Catch efficiency was estimated to be 37.94 kg/haul and catch rate was 25.29 kg/h. The catch was classified into economic (60.24%) and non-economic (39.76%) species. The total number of species caught in the Eastern Harbor was 46 species (31 economic, 15 non-economic) belonging to 31 families (16 economic, 15 non-economic). The economic category of species was dominated by the immigrant sardine species Herklotsichthys punctatus while the non-economic category was dominated by Engraulis encrasicolus. Eight species were lessepsian. In terms of abundance, seven species were recorded during four seasons, seven species occurred in three seasons ; ten species were found in two seasons while the rest occurred in one season only. Species compositions , size composition, the length-weight relationships as well as age composition for some dominant species were investigated. Fishing in sheltered places or nursery grounds with small meshed nets (0.5 cm) causes drastic danger to the fish populations of the Eastern Harbor.
• The high diversity indices were recorded in spring and summer. • A high percentage of recruits ... more • The high diversity indices were recorded in spring and summer. • A high percentage of recruits were captured before reaching their ripening stages. • 22 Lessepsian species out of 89 collected ones were recorded. • The authors propose simple anterior trawl changes in cod end mesh size from 2.5 to 4.0 cm. a b s t r a c t This article aimed to assess the species composition, seasonal distribution, length–weight relationships (LWRs); age composition and the non-indigenous species (Lessepsian species) of the non-target catch obtained by commercial bottom trawlers operated between Al Agamy and Abu Qir (west and east off Alexandria, Egypt). A total of 44 economic species and 45 non-economic species were recorded forming 51.2 % and 48.8 %, respectively of the total examined catch weight during the whole year 2014. The high diversity indices were recorded in spring and summer for economic species. The recruits of nine mostly important economic species in the region were recorded. Four species namely: Spicara maena; Pagellus acarne; Trachurus picturatus and Nemipterus japonicus had lengths between 8.5 and 10.9 cm appeared in spring while other five species namely: Pagellus erythrinus; Boops boops; Serranus hepatus; Spicara smaris and Mullus barbatus had lengths ranged between 7.00 and 11.00 cm appeared in summer. The exponent ''b'' of the length–weight relationship for 22 species varied between 2.1316 and 3.2415 for economic species and ranged between 2.6341 and 3.4406 for non-economic species. Age analysis showed that the life span of the majority of economic species is two years. The number of Lessepsian species recorded in this area was 22 species of which eleven were economic.
Sillago suezensis (GOLANI; FRICKE and TIKOCHINSKI, 2014) samples were collected during September ... more Sillago suezensis (GOLANI; FRICKE and TIKOCHINSKI, 2014) samples were collected during September and November 2013 from bottom trawlers operated off Port Said (Egyptian Mediterranean waters). It was evident that 87 specimens recorded had lengths between 12.0cm and 19.0cm with an average of 14.2cm while three specimens (recruits) with average length 7.0cm were recorded during November. Length-weight relationship showed negative allometric growth and condition factor varied between 0.877 for smaller size (12.0cm) and 0.642 for large size fishes (19.0cm). Age composition of this species revealed the presence of two age groups during September: age group one with mean length 13.62cm and age group two with average length 17.01cm. The sex ratio of males to females was 0.85: 1 however; males dominated the catch at length ranged between 12.0cm and 16.0cm but females dominated the catch at larger sizes between 17.0cm and 19.0cm. The maturity stages of males and females showed that both sexes were ripe during September and the appearance of recruits in November declared that this species nearly spawn during summer. The potential impacts of the economic Erythrean species in the Egyptian Mediterranean fisheries exhibit desirable consequences.
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