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Öğe AGE, GROWTH AND OTOLITH BIOMETRY-BODY LENGTH RELATIONSHIPS OF RED BANDFISH (Cepola macrophthalma L., 1758) IN THE SEA OF MARMARA, TURKEY(Trakya Univ Balkan Yerlesesi Enstituler Binasi, 2020) İşmen, Ali; Ihsanoglu, Mukadder Arslan; Daban, Ismail Burak; Inceoglu, HasimThe age, growth, and the otolith biometry-total length relationships of Cepola macrophthalma (Linnaeus, 1758) were investigated. The individuals were caught with beam trawl in the Sea of Marmara from March 2012 to June 2014. The individual with 51.5 cm total length sampled in this study was recorded as the new maximum size of C. macrophthalma in the Marmara Sea. The length-weight relationship showed negative allometric growth with a 1.36 b value. Otolith length-otolith weight, otolith width-otolith weight, otolith length-total length, otolith width-total length, otolith length-otolith width and total length-otolith weight relationships were found as OW=0.0002*OL2.6377 (R-2=0.91), OW=0.001*OWi(2.6215) (R-2=0.94), O=0.057*TL+3.2087 (R-2=0.57), OWi=0.0316*TL+1.8511 (R-2=0.55), OWi=0.527*OL+0.2015 (R-2=0.86), OW=0.0004*TL+0.0029 (R-2=0.58), respectively. Ages were estimated from 80 otolith readings and the minimum and maximum ages observed were 1 and 5 years, respectively. The growth parameters of the von Bertalanffy equation were calculated as L-infinity=61.95 cm, K=0.19 year(-1), t(0) = 0.05 years. A great majority of the stock (77%) consisted of younger individuals (1-2 age groups). Cepola macrophthalma stock consisted of mainly younger individuals which may indicate that an effective fishing pressure is effective on the stock.Öğe Age, Growth and Reproductive Biology of the Common Two-Banded Seabream (Diplodus vulgaris Geoffroy Saint-Hilaire, 1817) from the Northern Aegean Sea, Turkey(Springer International Publishing Ag, 2019) İşmen, Ali; Daban, Ismail Burak; Ihsanoglu, Mukadder Arslan; Yigin, Cahide Cigdem; Cabbar, Koray; Atak, SibelThe present study aims to describe population dynamics (age, growth, mortality and fecundity) of common two-banded seabream. Sampled individuals were obtained monthly between November 2017 and October 2018 directly from commercial fisherman in the Northern Aegean Sea. Ages were estimated from 327 otolith readings; the minimum and maximum ages observed were 1 and 8 years, respectively, corresponding to 13 and 29 cm total length (TL). The length-weight relationship was W = 0.0156*L-2.97 (R-2 = 0.92) for the whole population and isometric growth was detected. The growth parameters of Von Bertalanffy fitted to back-calculated size for age data were: L infinity = 30.69 cm, K = 0.20 and t(0) = -2.64 per year. The instantaneous rates of total mortality (Z) and natural mortality (M) were 0.86 and 0.47 per year, respectively. Rates of fishing mortality F and exploitation E were 0.39 and 0.35 per year, respectively. The spawning season extended from September to March and peaked in December. Total lengths at 50% maturity were 18.32 cm for males and 20.37 cm for females. Mean absolute fecundity (F) was 73,154 +/- 10,271 oocytes, ranging from 10,727 to 316,730.Öğe Age, growth and reproductive biology of the saddled seabream (Oblada melanura) in the North Aegean Sea, Eastern Mediterranean(Walter De Gruyter Gmbh, 2020) Daban, Ismail Burak; İşmen, Ali; Ihsanoglu, Mukadder Arslan; Cabbar, KorayThis study determines the length distribution, length-weight relationship, age, growth parameters, mortality rate, sex ratios, length at first maturity and reproduction of saddled seabream (Oblada melanura) collected monthly by fishermen around the Northern Aegean Sea between November 2017 and October 2018. The length-weight relationship was calculated as W = 0.0091 x L-3.11 (R-2 = 0.95) and positive allometric growth was found. The condition factor and GSI varied between 0.81-1.58 and 0.01-9.61, respectively. The spawning season extended from May to July and peaked in June. Total lengths at 50% maturity were 18.97 cm for males and 18.83 cm for females. Parameters of the von Bertalanffy growth equation were: L-infinity = 29.91 cm, K = 0.27 per year, t(0) = -0.82 year and age varied between 1 and 8. The instantaneous rates of total mortality (Z) and natural mortality (M) were 1.36 and 0.58 per year, respectively. Rates for fishing mortality F and exploitation E were 0.78 and 0.57 per year, respectively. The mean absolute fecundity (F) was 117 075 +/- 23 243 oocytes, ranging from 19130 to 470 132.Öğe Age, Growth, Mortality and Reproduction Biology of the Black Seabream, Spondyliosoma cantharus in North Aegean Sea, Turkey, Mediterranean Basin(Central Fisheries Research Inst, 2022) Daban, Ismail BurakIn the present study, the population parameters (length-length and length-weight relationships, age, growth, mortality) and reproductive biology (sex ratio, GSI, condition, length at first maturity, spawning period, fecundity) of black seabream (Spondyliosoma cantharus Linnaeus, 1758) were investigated. The length-length relationship and length-weight relationship were calculated as FL=0.911TL-0.0433 and W=0.0123TL(3.0614) (R-2=0.97), respectively. Parameters of the von Bertalanffy growth equation were: L-infinity=33.21 cm, K=0.21 per year, t(0) = -1.84 year and age varied between 0 and 8 years. The instantaneous rates of total mortality (Z) and natural mortality (M) were 0.64 and 0.47 per year, respectively. Rates for fishing mortality (F) and exploitation (E) were 0.17 and 0.27 per year, respectively. The spawning season extended from February to May and peaked in March and April. The female/male ratio was found to be 3.49/1 and sex inversion from female to male occurred after the 24 cm TL length group. Total lengths at 50% maturity were 22.25 cm for males and 20.59 cm for females. The mean absolute fecundity (F) was 109,457 +/- 8,011 oocytes, ranging from 59,666 to 182,589.Öğe Benthic marine litter in the Marmara Sea, Turkey(Ege Univ, Fac Fisheries, 2022) Sirin, Murat; Daban, Ismail Burak; İşmen, Ali; Ihsanoglu, Mukadder ArslanThis study presents the first data on benthic marine litter in the Marmara Sea, Turkey. To obtain the data, bottom trawl surveys were conducted at 34 sites between May 2017 and February 2018. The litter items were sampled and sorted following the MEDITS' relevant instructions. 660 pieces of litter, weighing 434.9 kg, were sampled. The litter density was found to range between 27.5 n/km(2) and 661.2 n/km(2), averaging 73.9 n/km(2), and the obtained items' weights ranged between 0.03 kg/km(2) and 1597.8 kg/km(2), averaging 48.7 kg/km(2). The plastic group L1 constituted 71.7% of the trawled litter. The highest mean litter density was detected in the Northeastern Marmara Sea in the spring and summer of 2018. The mean benthic litter density was found to be higher than the nearby areas. It was concluded that more effort should be invested in reducing marine pollution.Öğe Comparative study on the feeding ecology of the White Seabream, Diplodus sargus, and the Black Seabream, Spondyliosoma cantharus (Osteichthyes: Sparidae) in the North Aegean Sea(Taylor & Francis Ltd, 2022) Daban, Ismail BurakThe Black Seabream (Spondyliosoma cantharus) and the White Seabream (Diplodus sargus) of the Sparidae family occur in the same habitat and the aim of this study was to examine the feeding ecology and reveal dietary overlap between these two species. For this purpose, individuals were obtained from commercial longline fishermen from Gokceada Island, North Aegean Sea. Algae, hydrozoans and Cnidaria (Anemonia sp.) were the most preferred food items for the Black Seabream, whereas Gastropoda (Prosobranchiata), Brachyura (Goneplax rhomboides) and Echinodermata (Paracentrotus lividus) were most frequent food items for the White Seabream. Feeding activity and diet diversity were higher in summer. A clear dietary shift from smaller and semi-mobile prey (such as Gastopoda) to large and mobile prey (such as Brachuya) was found for both species with the increase in length. No dietary overlap was found between the two co-occuring species.Öğe Fish larvae assemblages of Gokceada Island, North Aegean Sea: effect of weekly sampling interval on their incidences(Tubitak Scientific & Technological Research Council Turkey, 2020) Daban, Ismail Burak; İşmen, AliThe species composition and temporal variations of fish larvae in shallow waters (<20 m) of Gokceada Island located in the North Aegean Sea were studied weekly using WP-2 plankton nets. In this study, a total of 2281 fish larvae belonging to 31 families and 55 species were sampled. The highest biomasses for families were for Clupeidae, Myctophidae, Engraulidae, and Sparidae, whereas the highest species richness for families were for Sparidae, Myctophidae, and Labridae. Sardine pilchardus larvae were the most predominant larval species with a total biomass of 8036.1 ind./1000 m(3)(55.1%). Significant differences in larval biomass were evident between the months, whereas there were no differences evident between species richness. Biomass and species richness of fish larvae were highest in the winter and summer. Compared with similar studies carried out on larger geographical areas, similar species diversity and biomass were also found in this study. It was observed that the occurrence of some larvae species that had shorter spawning duration increased with the frequent sampling interval.Öğe Further range expansion of the blue crab Callinectes sapidus (Rathbun, 1896) (Crustacea: Decapoda: Brachyura) in Turkish waters, Northern Aegean Sea: insight into distribution depth(Cahiers De Biologie Marine, 2016) Daban, Ismail Burak; Cengiz, Ozgur; Tuncer, SezginerA new record of Callinectes sapidus from the northern eastern part of the Aegean Sea is presented, based on a live single female sampled off northern part of the Gokceada (Imbroz) Island. Surprisingly, the individual which is known shelf-estuarine species was sampled at 220 m depth with a bottom trawl on November 15th, 2015.Öğe Gillnet selectivity for non target fish species caught by red mullet gillnets north Aegean Sea(Ege Univ, Fac Fisheries, 2018) Kocabas, Engin; Öztekin, Alkan; Daban, Ismail Burak; Ayaz, AdnanThe aim of this study is to determine the effects of red mullet gillnets that commonly used in Turkish waters on sustainability of non target fish species. For these purpose, surveys were realized with 18 - 20 - 22 mm nominal bar length red mullet gillnets between December 2008 and May 2010 along the north Aegean Sea coasts (5-30 m). SELECT method was used with five different model (Normal location, normal scale, log-normal, gamma and bi-modal) for evaluating selectivity parameters of non target fish species. Selectivity models were determined as bi-modal for Serranus scriba and Symphodus tinca, log normal for Scorpaena porcus and Spicara maena and gamma for Pagellus acarne. Optimum catch lengths and spread values and selectivity curves were given for 5 species. Results showed that use of a larger mesh size over the 22 mm mesh is important for ensuring stock sustainability of the non target fish species.Öğe Length-Weight Relationships of 17 Teleost Fishes in the Marmara Sea, Turkey(Kahramanmaras Sutcu Imam Univ Rektorlugu, 2020) Daban, Ismail Burak; Arslan Ihsanoglu, Mukadder; İşmen, Ali; Inceoglu, HasimLength weight relationship parameters were determined for 17 fish (Arnoglossus kessleri, Blennius ocellaris, Callionymus lyra, Cepola macrophthalma, Citharus linguatula, Lesueurigobius friesii, Merluccius merluccius, Lophius piscatorius, Merlangius merlangus, Gobius niger, Mullus barbatus, Solea solea, Spicara maena, Serranus hepatus, Trachurus trachurus, Trachurus mediterraneus, Uranoscopus scober) species in the Marmara Sea. Fish samples were collected monthly bases between September of 2011 and July of 2014 with a beam trawl. The growth type of each species were determined and the calculated b values changed in range from 1.2565 to 3.4018.Öğe Length-weight relationships of 26 fish species caught by longline from the Gallipoli peninsula, Turkey (northern Aegean Sea)(Cahiers De Biologie Marine, 2016) Öztekin, Alkan; Ozekinci, Ugur; Daban, Ismail BurakLength-weight relationship parameters were presented for 26 fish species from the Gallipoli peninsula, Turkey. Samples were caught in depths between 0-400 m by longline between January 2012 and January 2013. The sample sizes, minimum and maximum lengths and weights, length-weight relationships, SE (b), R-2 and growth type were summarized. The values of the exponent b in the length-weight relationship W = aL(b) ranged from 2.522 to 3.336 and the median value was 2.899 (+/- SE = 0.043).Öğe Pelagic larval history dynamics of two Sparid species from North Aegean Sea based on otolith microstructure analyses(Cahiers De Biologie Marine, 2022) Daban, Ismail Burak; İşmen, AliKnowledge about early life history dynamics is a vital tool for understanding life cycle, stock status, species biology and sustainability. To contribute to the knowledge of early life history traits, we examined and compared early life history parameters of Diplodus annularis and Pagellus bogaraveo based on otolith microstructure analyses. Forthis purpose, fish larvae individuals were collected from the natural living environment between May 2015 and March 2016 in shallow waters around Gokceada Island, North Aegean Sea. As fixative method and duration can cause damage to larval otoliths, pre-trials were conducted and 9 h formaldehyde fixation was determined as the most suitable. By means of weekly sampling intervals, hatching was ranged between May 4th and September 6th for D. annularis and from October 17th to December 2nd for P. bogaraveo, respectively. The spawning duration was relatively shorter for P. bogaraveo than for D. annularis. Higher daily growth rate and higher mortality rate were determined for D. annularis. Due to the same highest larvae length, it was observed that D. annularis reached this length in a shorter time. This may be caused by challenging winter conditions that P. bogaraveo faces.Öğe Reconfirmed occurrance and northward expansion of the royal flagfish Aulopus filamentosus (Bloch, 1792) from the Aegean Sea(Ege Univ, 2017) Daban, Ismail Burak; Cakir, Kamil; Acarli, Deniz; İşmen, AliA single male specimen of the royal flagfin (Aulopus filamentosus), 369 mm total length was caught with the longline from the Gokceada Island, north Aegean Sea. This report constitutes the reconfirmed occurrance with gives precise locality information from the Turkish waters and this record reflects northernmost expansion of this species in the Aegean Sea.Öğe Relationships between body size - otolith size for seven demersal fish species from the Marmara Sea, Turkey(Ege Univ, Fac Fisheries, 2020) Daban, Ismail Burak; Ihsanoglu, Mukadder Arslan; İşmen, AliThe total length-otolith length (TL-OL), total length-otolith width (TL-OWi), total length-otolith weight (TL-OW) and total weight-otolith weight (TW-OW) relationships of seven fishes in the Marmara Sea, Turkey were calculated. Measurements of sagittal otoliths (length, width and weight) and individuals (total length and total weight) from these species (Gaidropsarus biscayensis, Mediterranean bigeye rockling; Arnoglossus kessleri, Scaldback; Solea solea, Common sole; Uranoscopus scaber, Stargazer; Lophius budegassa, Blackbellied angler, Lepidorhombus boscii, The four-spot megrim and Lesueurigobius friesii, Fries's goby) were given. Linear regression analysis (y = bx + a) was used to determine the relationship between each morphometric character and the coefficient of determination (r(2)) were calculated. Highest determination coefficient were determined for L. budegassa and A. kessleri to TW-OW, for S. solea, and U. scaber to TL-OL, for G. biscayensis and L. boscii to TL-OWi, for L. friesii to TL-OW. The relatively lower determination coefficients were found for G.biscayensis, compared with others. These relationships provide vital information on species identification and size estimation of fish in predator-prey studies, we believe these results will be useful in future studies of stomach contents.
