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    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, Hasim
    The 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.
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    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, Sibel
    The 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.
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    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, Koray
    This 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.
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    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 Burak
    In 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.
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    Benthic marine litter in the Marmara Sea, Turkey
    (Ege Univ, Fac Fisheries, 2022) Sirin, Murat; Daban, Ismail Burak; İşmen, Ali; Ihsanoglu, Mukadder Arslan
    This 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.
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    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 Burak
    The 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.
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    Estimation of spawning stock biomass and spawning areas of sardine, (Sardina pilchardus) with winter time ichthyoplankton sampling in the Sea of Marmara, Turkiye
    (Ege Univ, Fac Fisheries, 2024) Daban, Ismail Burak; Sen, Yusuf; Öztekin, Alkan; Ayaz, Adnan; Altinagac, Ugur; İşmen, Ali; Yuksek, Ahsen
    The spawning areas and spawning stock biomass of sardine were studied with ichthyoplankton sampling in the winter period from the 32 stations, in the Marmara Sea. The mean fish egg and larvae biomass in a unit area were calculated as 18.4 +/- 5.3 eggs/10 m(2) and 2.5 larvae/10 m(2), respectively. Three main spawning areas were detected as Karacabey Floodplain area, Gonen, and Buyukcekmece estuarine area. The larvae are mostly located in the western part. The batch fecundity of sardine was detected between 2415.9 and 16738.3, with a mean of 6899.8 +/- 255.7 eggs. The sex ratio (R), spawning fraction (S), mortality rate, and daily egg production (Po) were calculated as 0.53, 0.098, 0.62, and 9.25 eggs/m(2) in the Marmara Sea. The spawning stock biomass (B) is estimated at 2998 tonnes in the Marmara Sea. Both ichthyoplankton biomass and spawning stock biomass were found relatively lower. It is recommended to apply stricter management sanctions for the sustainability of sardine stocks.
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    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, Ali
    The 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.
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    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, Sezginer
    A 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.
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    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, Adnan
    The 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.
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    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, Hasim
    Length 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.
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    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 Burak
    Length-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).
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    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, Ali
    Knowledge 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.
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    Population Structure, Age, Growth and Reproduction Biology of Piper Gurnard, Trigla lyra (Linnaeus, 1758) in the Sea of Marmara, Turkey
    (Springer Int Publ Ag, 2024) Sirin, Murat; Daban, Ismail Burak; XIhsanoglu, Mukadder Arslan; İşmen, Ali; Yigin, C. cigdem
    This study describes the biomass, age, growth, mortality and reproduction biology of piper gurnard, Trigla lyra. Individuals were obtained with monthly trawl surveys between March 2017 and December 2018 from 34 stations located in the Sea of Marmara, Turkey. Mean Catch per unit effort (CPUE-kg/h) and stock amounts (biomass kg/km(2)) were calculated as 0,62 kg/h and 8,54 kg/km(2), respectively. The age interval was determined as between I and VIII. Von Bertalanffy growth parameters were determined as L infinity = 59.92 cm, K = 0.21 per year and t0 = -0.36 for females and L infinity = 78.53 cm, K = 0.13 per year and t0 = -0.41 for males. The total mortality (Z) was determined as 0.55 t(-1). The natural mortality (M) and fishing mortality (F) were estimated as 0.36 t(-1) and 0.19 t(-1). The exploitation rate was determined as 0.35 t(-1). The length at first maturity (L50) was calculated as 32.7 cm TL for females and 25.2 cm TL for males. The spawning period of T.lyra was determined between December and April and peaked in March.
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    Post-Mucilage Distribution, Daily Growth, Mortality, and Hatch Date Timing of Sand steenbras Lithognathus mormyrus (Linnaeus, 1758) Juveniles in the Sea of Marmara
    (Istanbul Univ Press, Fac Aquatic Sciences, 2024) Daban, Ismail Burak; Sen, Yusuf; Öztekin, Alkan; Ayaz, Adnan; Altinagac, Ugur; İşmen, Ali; Yuksek, Ahsen
    Between 2021-2022, a dense mucilage disaster occurred in the Sea of Marmara in T & uuml;rkiye. Mucilage mostly covered coastal areas, which juvenile fish use for nurseries, growth, and protection. Due to Sand steenbras having been suggested as an environmental bioindicator species for Mediterranean coastal waters, this study attempts to reveal post-mucilage distribution and potential differences on the timing of hatching, daily age, growth, and mortality as revealed by the otolith microstructure. Individuals were sampled using beach seine nets from 12 equally spaced stations along the Sea of Marmara. Its presence and significant abundance in 10 out of 12 stations showed the Sand steenbras to be a common juvenile species for the Sea of Marmara. Hatching occurs between MayJanuary, with peak hatching occurring in October. When considering that the mucilage had completely disappeared from the environment in August, the first set of hatching months can be seen to coincide with the dense mucilage. Thus, Sand steenbras can be considered as able to reproduce under these environmental conditions. The daily age of the Sand steenbras juveniles ranged between 38-235 days, with a mean of 120.3 +/- 1.8 days. The daily growth and mortality rates were also calculated respectively as 0.226 mm/day and 4.11%.
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    Postmucilage biodiversity of shallow water fish assemblages: A case study in the Marmara Sea, Turkey
    (Tubitak Scientific & Technological Research Council Turkey, 2023) Daban, Ismail Burak; Sen, Yusuf; Ayaz, Adnan; Altinagac, Ugur; Öztekin, Alkan; Ozekinci, Ugur; İşmen, Ali
    A dense mucilage event occurred between November 2020 and August 2021 in the Marmara Sea, Turkey. In this study, the aim was to understand the effect of mucilage on coastal fish biodiversity. For this purpose, juvenile and small-sized adult fish species were sampled with an experimental beach seine at 12 equally-spaced stations around the Marmara Sea between November 2021 and April 2022. In total, 34 species belonging to 19 families were sampled. Approximately 70% of the total fish abundance were Atherina boyeri Risso, 1810, Chelon auratus (Risso, 1810) and Chelon saliens (Risso, 1810). Highest abundance was detected from S5 (Marmara Ereglisi) and S11 (Florya) comprising 17.3% and 14.2% of total abundance, respectively. Maximum species richness was found at S4 (Erdek) and S12 (Yalova Tigem), with 21 and 18 species, respectively. The highest biodiversity indexes were seen at S4, S8 (Karacabey floodplain area) and S12, whereas the lowest biodiversity index was found at S9 (Buyukcekmece). S4 and S8 should be monitored and protected by fisheries management authorities due to being nursery and protection areas for the Sea of Marmara. When the biomass and biodiversity of the coastal fish assemblages were compared with previous studies conducted before the mucilage event, it can be said that mucilage did not adversely affect recruitment success.
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    Presence of abnormal otoliths in hallucinogenic fish and their comparison with normal otoliths using light and scanning electron digital imaging
    (Wiley, 2024) Yedier, Serdar; Daban, Ismail Burak; Sen, Yusuf; Bostanci, Derya
    The otolith organs located in the inner ear of the fish are responsible for vital activities such as balance and hearing. Abnormalities in these organs can adversely affect the vital activities of the fish species. The main purpose of the study is to analyze the abnormalities in the otoliths of Sarpa salpa, known as the hallucinogenic fish. For that, 372 individuals of S. salpa are collected from the North Aegean Sea. As a result of the abnormality analyses in S. salpa otoliths, anomalies were detected such as various prominence structures on the surface of the otolith caused by accumulation and a more transparent appearance due to the different crystal structures in some parts of the otolith. These abnormalities were found in the left and/or right otoliths of male and female individuals in different total lengths. The percentage of individuals with abnormal otoliths of S. salpa is calculated as 52.42%. It was determined that there are statistical differences between the left and right otolith measurements of male and female individuals with abnormal and normal otoliths(p < 0.05). There is no relationship between the percentage of individuals showing abnormality and total length and sex. The current study presents for the first time abnormal otolith information on left and right otoliths in male and female S. salpa. It is thought that abnormalities in hallucinogenic fish otoliths could be related to genetic predisposition as well as stress due to nutritional preference, pollutants, and environmental factors.
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    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, Ali
    A 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.
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    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, Ali
    The 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.
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    Some biological aspects of White seabream, Diplodus sargus (Linnaeus, 1758) from the northeastern Aegean Sea, Turkiye
    (Ege Univ, Fac Fisheries, 2024) Daban, Ismail Burak; İşmen, Ali; Ihsanoglu, Mukadder Arslan
    In the study, the age, growth, mortality parameters and length-weight relationship parameters of Diplodus sargus (white seabream) collected by a small-scale fisherman between August 2020 and July 2021 along the northeastern coast of Aegean Sea (Turkiye coast), were investigated. D. sargus had a range of total length and weight from 14.3 cm to 36.7 cm and from 50.5 g to 836.5 g, respectively. The length-weight relationships (LWRs) were calculated as W=0.02368*L-2.881 for females, W = 0.01847*L-2.959 for males and W = 0.01989*TL2.936 for both sexes. Using data from fish scales, the maximum age was determined to be 11 years. von Bertalanffy growth parameters have been calculated as follows L-infinity=39.01 cm TL, K=0.13 year(-1), and t(0)= -2.58 year for both sexes combined. Total (T), natural (N) and fishing (F) mortalities were defined as Z: 0.83 year-1, M: 0.33 year(-1) and F: 0.50 year(-1) for both sexes combined. The exploitation rate (E) was calculated as 0.70, 0.44 and 0.60 for females, males and combined, respectively.