Yazar "Akalin, Sencer" seçeneğine göre listele
Listeleniyor 1 - 11 / 11
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe The Diet Composition of European Anchovy, Engraulis encrasicolus (Linnaeus, 1758) in Izmir Bay, Aegean Sea(Central Fisheries Research Inst, 2019) Akalin, Sencer; Sever, Tuncay Murat; Ilhan, Dilek; Unluoglu, AydinIn this study, seasonal and size related variations in the diet composition of European anchovy (Engraulis encrasicolus) were studied. A total of 545 European anchovy individuals were collected from commercial purse-seine catches in Izmir Bay (Aegean Sea, Turkey) during 2005-2006. Overall, 498 of the stomachs were found with food items and 47 were empty. A total of 19 different prey groups were identified belonging to eight major systematic groups, i.e. Siphonophora, Polychaeta, Crustacea, Mollusca, Echinodermata, Chaetognatha, Appendicularia and Actinopterygii in the stomachs. Crustaceans (especially Copepoda) were the most important preys in terms of IRI% at all seasons and size groups. According to the Bray Curtis similarity index, while there were no significant differences in the diet composition among seasons, only the fishes bigger than 12 cm were seen different from other size groups. This study represents the most detailed information on the organisms in the diet of European anchovy from the Turkish coast of the Aegean Sea.Öğe Establishing a fish repository at Ege University Faculty of Fisheries (1965-2023): A Journey on a long and challenging road to becoming a museum(Aquaculturehub Inc, 2024) Bayhan, Bahar; Akalin, Sencer; Akcinar, Salim C.; Taylan, Burcu; Kaya, Murat; Taskavak, Ertan; Ozaydin, OkanThis study examined preserved marine fish specimens collected from numerous field coasts since 1965. Our review and categorization of these materials revealed that the specimens belong to 360 species from 131 families. Current data shows that the museum collection includes 20 species of cartilaginous fish and 8 species of bony fish listed as endangered on the IUCN Red List, alongside 54 non-native fish species. Prepared according to museum standards by Ege University Fisheries Faculty's Scientific Material (ESFM), this collection of Turkish marine fish constitutes 66% of all Turkish marine fish fauna. This makes it the largest and oldest marine fish collection in T & uuml;rkiye. Considering T & uuml;rkiye's maritime borders with neighboring countries, this collection is significant nationally and globally. Given the diverse marine fish species in Turkish seas over the past half-century, this preserved material is a vital reference for local and foreign ichthyologists. If organized and transformed into a visitable museum, this extensive collection could raise awareness about the diversity of marine fish species in our seas. As a result, we have established the biological repository of Turkish Marine Fish Department in the Faculty Museum, now known as the Fisheries Faculty's Scientific Material (ESFM) at Ege University. We present the fish in the collection as a species list.Öğe Gut contents and feeding habits of the Great Pipefish, Syngnathus acus Linnaeus, 1758, in Izmir Bay (Aegean Sea, Turkey)(Max Kasparek Verlag, 2010) Taskavak, Ertan; Gurkan, Sule; Sever, Tuncay Murat; Akalin, Sencer; Ozaydin, OkanA total of 112 stomachs of the Great Pipefish, Syngnathus acus Linnaeus, 1758 (56 females and 38 males), was collected in Izmir Bay (Aegean Sea) and analysed in order to determine the feeding habits. 95 specimens (85.6%) were found with prey items in their stomachs. Zoo-planktonic organisms were the main food and in terms of numerical (NO%) and frequency (FO%) of occurrence, four main prey categories were determined in the gut content of this species. The most dominant group was found to be harpacticoid copepods (33.6% NO; 57.7% FO), followed by Amphipoda (22.3% NO; 38.2% FO), cypris larvae (12.8%NO; 21.9%FO) and decapod crustaceans (9.5% NO; 16.3% FO), respectively. The numbers of their occurrence indicated that there were significant differences between the seasons. Seasonal differences in the gut content were found in 9 prey groups in spring (p<0.05) and 6 in winter (p<0.05), showing that feeding is more diverse in spring than in winter. Similarly, the number of occurrences indicated that there was a significant difference in the first (p<0.05) and fourth size groups (p<0.05). However, no significant difference was found in the feeding pattern between sexes (p>0.05). Consequently, small crustaceans were the most important prey to be consumed in all seasons by all size groups of Syngnathus acus, whereas decapod crustacean larvae/eggs, larger prey items, were preferred by larger specimens.Öğe Gut contents and feeding habits of the Great Pipefish, Syngnathus acus Linnaeus, 1758, in Izmir Bay (Aegean Sea, Turkey)(Max Kasparek Verlag, 2010) Taskavak, Ertan; Gurkan, Sule; Sever, Tuncay Murat; Akalin, Sencer; Ozaydin, OkanA total of 112 stomachs of the Great Pipefish, Syngnathus acus Linnaeus, 1758 (56 females and 38 males), was collected in Izmir Bay (Aegean Sea) and analysed in order to determine the feeding habits. 95 specimens (85.6%) were found with prey items in their stomachs. Zoo-planktonic organisms were the main food and in terms of numerical (NO%) and frequency (FO%) of occurrence, four main prey categories were determined in the gut content of this species. The most dominant group was found to be harpacticoid copepods (33.6% NO; 57.7% FO), followed by Amphipoda (22.3% NO; 38.2% FO), cypris larvae (12.8%NO; 21.9%FO) and decapod crustaceans (9.5% NO; 16.3% FO), respectively. The numbers of their occurrence indicated that there were significant differences between the seasons. Seasonal differences in the gut content were found in 9 prey groups in spring (p<0.05) and 6 in winter (p<0.05), showing that feeding is more diverse in spring than in winter. Similarly, the number of occurrences indicated that there was a significant difference in the first (p<0.05) and fourth size groups (p<0.05). However, no significant difference was found in the feeding pattern between sexes (p>0.05). Consequently, small crustaceans were the most important prey to be consumed in all seasons by all size groups of Syngnathus acus, whereas decapod crustacean larvae/eggs, larger prey items, were preferred by larger specimens.Öğe Gut Contents of Two European Seahorses Hippocampus hippocampus and Hippocampus guttulatus in the Aegean Sea, Coasts of Turkey(Zoological Soc Pakistan, 2011) Gurkan, Sule; Taskavak, Ertan; Sever, Tuncay Murat; Akalin, SencerThis study investigates the diet of adult wild seahorses, Hippocampus hippocampus and Hippocampus guttulatus from the Aegean Sea, along the coasts of Turkey. A total of 47 fish stomachs (H. hippocampus = 25, H. guttulatus = 22) were analyzed to determine diet according to fish size and sex. Twenty one of specimens of H. hippocampus (84%) had prey in their stomachs. The remaining 4 fish (16%) had empty stomachs. Sixteen H. guttulatus (72.73%) had prey in their stomachs. The remaining 6 fish (27.27%) had empty stomachs. Whereas Mysidaceae (26.92%) and Amphipoda (23.08%) were the main prey groups in diet of H. hippocampus, Mysidaceae (42.59%) and Decapod crustacean larvae (22.22%) constituted the most important food source of II. guttulatus. Because H. guttulatus is a moderately generalized benthonic predator, the food diversity in its gut was greater than in H. hippocampus. There were no differences in diets between males and females of either seahorse species.Öğe LENGTH-WEIGHT RELATIONSHIP AND CONDITION FACTOR OF THE MEDITERRANEAN TOOTHCARP, APHANIUS FASCIATUS (VALENCIENNES, 1821) FROM IZMIR COASTAL WATERS (AEGEAN SEA, TURKEY)(Parlar Scientific Publications (P S P), 2018) Ilhan, Dilek; Ilhan, Ali; Akalin, SencerIn this study, we determined the length-weight relationship and condition factor of Aphanius fasciatus collected at three different localities in Izmir province coastal waters, namely Camalti Salt Lake, Gulbahce Bay and Homa Lagoon. A total of 800 individuals, 580 females and 220 males, were caught using by beach-seine during seasonal samplings between March 2016 and February 2017. The total length and weight of the caught specimens ranged from 1.60 to 6.40 cm and 0.042-4.531 g in females; and 2.30-5.00 cm and 0.161-1.872 g in males respectively. Length-weight relationship parameters were calculated separately for each locality and sex. According to the results of growth type test, females had positive allometric growth in all localities, while males isometric in Camalti and Homa, and allometric growth in Gulbahce. The condition factor values estimated for each sex, season and locality varied between 0.67 to 2.35.Öğe The occurrence of xanthochroism in the thinlip grey mullet, Chelon ramada (Teleostei: Mugilidae), from the Aegean Sea(Tubitak Scientific & Technical Research Council Turkey, 2020) Akalin, Sencer; Tosunoglu, ZaferIn this study, the first case of aberrant coloration, namely xanthochroism or xanthism, in the thinlip grey mullet, Chelon ramada (Teleostei: Mugilidae), was reported. The specimen was caught by a purse seiner in November 2019, in Izmir Bay, in the Aegean Sea, and was a female, with mature ovaries, which indicated that it had been in spawning migration or activity on the sampling date.Öğe On the growth of the scaldfish Arnoglossus laterna (Walbaum, 1792) from Izmir Bay, central Aegean Sea(Tubitak Scientific & Technical Research Council Turkey, 2010) Ilhan, Dilek Uckun; Akalin, Sencer; Ozaydin, Okan; Tosunoglu, Zafer; Leblebici, SemihScaldfish (Arnoglossus laterna) (n = 1892) were caught in Izmir Bay (Aegean Sea) from January 2005 to December 2006. Total length and weight of all specimens ranged from 3.9 to 16.0 cm and from 0.47 to 41.63 g, respectively. The overall ratio of females to males was 1:1.91. The length-weight relationships for females, males, and all specimens combined were estimated, respectively, as W = 0.0096 x L(2.921), W = 0.0111 x L(2.857), and W = 0.0096 x L(2.917); and the parameters of the von Bertalanffy growth equations were, respectively, L(infinity) = 17.58, 15.36, and 17.19 cm; k = 0.412, 0.461, and 0.495 year(-1); and t(o) = -0.379, -0.332, and -0.380 year. The growth performance index values (Phi) were 2.105, 2.036, and 2.165, respectively.Öğe On the growth of the scaldfish Arnoglossus laterna (Walbaum, 1792) from Izmir Bay, central Aegean Sea(Tubitak Scientific & Technical Research Council Turkey, 2010) Ilhan, Dilek Uckun; Akalin, Sencer; Ozaydin, Okan; Tosunoglu, Zafer; Leblebici, SemihScaldfish (Arnoglossus laterna) (n = 1892) were caught in Izmir Bay (Aegean Sea) from January 2005 to December 2006. Total length and weight of all specimens ranged from 3.9 to 16.0 cm and from 0.47 to 41.63 g, respectively. The overall ratio of females to males was 1:1.91. The length-weight relationships for females, males, and all specimens combined were estimated, respectively, as W = 0.0096 x L(2.921), W = 0.0111 x L(2.857), and W = 0.0096 x L(2.917); and the parameters of the von Bertalanffy growth equations were, respectively, L(infinity) = 17.58, 15.36, and 17.19 cm; k = 0.412, 0.461, and 0.495 year(-1); and t(o) = -0.379, -0.332, and -0.380 year. The growth performance index values (Phi) were 2.105, 2.036, and 2.165, respectively.Öğe Temporal Variability in Abundance of Demersal Fish Community from Izmir Bay, Turkey(Medwell Online, 2009) Can, M. Fatih; Tosunoglu, Zafer; Ozaydin, Okan; Demirci, Aydin; Guder, H. Salih; Aydin, Celalettin; Leblebici, Semih; Akalin, Sencer; Uckun, DilekTemporal variabilities of demersal fish species were analaysed in terms of their numerical abundance in the Izmir Bay. A total of 545559 specimen belonging to eight different families were caught in 2005, covering all the year using a R/V trawl. The contribution of each family was Sparidae (34.38%), Serranidae (22.25%), Bothidae (15.09%), Mullidae (14.22%), Gobidae (3.71%), Centracanthidae (1.01%) and Uranoscopidae (0.28%). Based on temporal variabilities of the families, cluster analysis identified three main groups, which were group-I: the Mullidae, group-II: the Centracanthidae, Uranoscopidae, Bothidae, Gobidae and Serranidae and finally group-III: the Sparidae and Triglidae. The family belonging to the first group was more abundant in cold months (picked in January) than others. The second group were more yielded in general from June-October (picked in October). The third group were more abundant in May and June.Öğe Temporal Variability in Abundance of Demersal Fish Community from Izmir Bay, Turkey(Medwell Online, 2009) Can, M. Fatih; Tosunoglu, Zafer; Ozaydin, Okan; Demirci, Aydin; Guder, H. Salih; Aydin, Celalettin; Leblebici, Semih; Akalin, Sencer; Uckun, DilekTemporal variabilities of demersal fish species were analaysed in terms of their numerical abundance in the Izmir Bay. A total of 545559 specimen belonging to eight different families were caught in 2005, covering all the year using a R/V trawl. The contribution of each family was Sparidae (34.38%), Serranidae (22.25%), Bothidae (15.09%), Mullidae (14.22%), Gobidae (3.71%), Centracanthidae (1.01%) and Uranoscopidae (0.28%). Based on temporal variabilities of the families, cluster analysis identified three main groups, which were group-I: the Mullidae, group-II: the Centracanthidae, Uranoscopidae, Bothidae, Gobidae and Serranidae and finally group-III: the Sparidae and Triglidae. The family belonging to the first group was more abundant in cold months (picked in January) than others. The second group were more yielded in general from June-October (picked in October). The third group were more abundant in May and June.
