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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 Reproduction of Silvery Pout (Gadiculus argenteus Guichenot, 1850) in the Saros Bay (Northeastern Aegean Sea)(Springer International Publishing Ag, 2019) İşmen, Ali; Yigin, Cahide Cigdem; Ihsanoglu, Mukadder Arslan; Oz, Melike IdilThe age, growth and reproduction of Silvery Pout (Gadiculus argenteus), caught in the Bay of Saros (Northeastern Aegean Sea) between April 2005 and September 2008, were investigated. The total length and weight of the G. argenteus ranged from 5.5 cm to 16.8 cm in total length (TL) and from 1.6 g to 30.7 g in weight. The length-weight relationships were estimated W = 0.011*TL2.924.Age data derived from otoliths readings were used to estimate the growth parameters of the von Bertalanffy equation. The population growth parameters for G. argenteus were estimated as L-infinity = 14.97 cm, K = 0.28 year(-1) and t(0) = -1.69 year. The maximum age was 5 years. The data on maturity stages indicated that length at 50% maturity (L-50) were 8.94 cm TL for G. argenteus. Monthly values of the gonadosomatic index indicated that reproduction period of G. argenteus was determined between December and March.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, and Reproduction of Common Sole, Solea solea (Linnaeus, 1758) in the Sea of Marmara, Turkey(2021) Daban, İsmail Burak; Ihsanoglu, Mukadder Arslan; İşmen, Ali; Yığın, Cahide ÇiğdemThis study revealed the length-weight relationship, age, growth and mortality parameters, and reproductive biology of thecommon sole, Solea solea in the Sea of Marmara, Turkey. Samplings were conducted with bottom trawl between March2017 and December 2018 at 34 stations. The length-weight relationship was calculated as W=0.0082×TL3.01. Ages wereranged between 1 and 5 years. The von Bertalanffy growth parameters were calculated as L?=34.56 cm, K=0.48 y-1, and t0=-0.01 y. The size at first maturity was 21.9 cm TL. The extended reproduction period was observed (from September to April).The rates of natural mortality (M), total mortality (Z), fishing mortality (F), and exploitation rate (E) were calculated to be0.79, 2.4, 1.61, and 0.67, respectively. The biological reference points were calculated as Fopt=0.395; Flim=0.53 andEopt=0.333, respectively. The length where the maximum yield can be obtained (Lopt) was found as 22.3 cm TL. The resultsshowed that S.solea is under the influence of excessive fishing pressure in the Sea of Marmara.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 Biological traits and population dynamic of Parapenaeus longirostris (Lucas, 1846) in the Marmara Sea, Turkey(Ege Univ, Fac Fisheries, 2020) Ihsanoglu, Mukadder Arslan; İşmen, AliParapenaeus longirostris is a valuable resource for the crustacean fisheries in the Marmara Sea, therefore, in this study length-weight relationships, growth, mortality, reproduction, recruitment patterns, the probabilities of capture and per recruit analyses were determined. Total 36288 samples were collected by beam trawl between September 2011 and July 2014 in 229 sampling stations. The total length (TL), body weight (g) and carapace length (CL) values ranged between 34 -175 mm, 0.2 - 28.9 g and 8 - 41 mm, respectively. CL-weight relationship equations were calculated for females, males and combined sexes, respectively, W=0.0023xCL(2.)5, W=0.0029xCL(2.43), W=0.0022xCL(2.52). The growth parameters were determined as L-infinity=199.5 mm, k=0.47, t(0)=-0.5 in TL, L-infinity=36.8 mm, k=0.37, t(0)=-0.69 in CL. L-25, L-50, and L-75 values were found to be 15.15 mm, 16.29 mm, 17.44 mm for males and 16.62 mm, 18.07 mm, 19.52 mm for females. The sexual maturity length for females was found 27.3 mm CL and the exploitation rate was found at 0.62 for the whole population.Öğe First Record of Caligus zei (Copepoda: Caligidae) on John Dory, Zeus faber in Turkish Marine Waters(Springer Int Publ Ag, 2018) Oktener, Ahmet; Sirin, Murat; İşmen, Ali; Kara, Alparslan; Daban, Burak; Ihsanoglu, Mukadder ArslanThe parasitic copepod, Caligus zei Norman and Scott T., 1906 was found on the John dory (Zeus faber Linnaeus, 1758) during a demersal fish stock assessment in the Sea of Marmara during April 2017. This is the first report of this copepod in Turkish marine waters. Descriptions of the male and female Caligus zei, including details of appendage structure of recovered specimens, are provided.Öğe Growth Parameters and Reproductive Biology of Citharus linguatula (Linnaeus, 1758) from the Sea of Marmara (Turkey)(2021) Daban, İsmail Burak; Ihsanoglu, Mukadder Arslan; İşmen, Ali; Şirin, Murat; Yığın, Cahide ÇiğdemAn economically important species of Citharus linguatula was investigated in the Sea of Marmara (Eastern Mediterranean, Turkey). Length-weight relationships, growth parameters, reproductive time, and first sexual maturity length of the species were determined. A total of 236 individuals were analyzed, total length and weight varied from 7.5 to 26.5 cm TL (17.11±3.62 cm) and 2.67 to 180.81 g (44.07±1.84 g), respectively. The length-weight relationship was calculated as W=0.0047*TL3.17 in total. The growth type was positive allometry for both sexes. Total individuals were ranged in age between 1 and 4. According to sexes, von Bertalanffy growth parameters were calculated as L?=23.44 cm, K=0.74 per year, and t0=-0.09 year for females and L?=20.75 cm, K=0.56 per year, and t0=-1.14 year for males. The size at first maturity was 17.6 cm TL for males, and 16.7 cm TL for females. When sexual maturity, K, and GSI values were evaluated together, the reproduction period of C. linguatula was determined between September and December.Öğe Length-Weight and Otolith Morphometry Relationships of Hoplostethus mediterraneus Cuvier, 1829 from the Saros Bay, Northern Aegean Sea(Springer Int Publ Ag, 2025) İşmen, Ali; Yigin, Cahide Cigdem; Oz, Melike Idil; Ihsanoglu, Mukadder ArslanThe relationship between total length (TL) and total weight (TW) and the morphometric relationships of the otolith between total length and otolith length (OL), total length and otolith weight (OW) and otolith length and otolith weight of Hoplostethus mediterraneus were examined in Saros Bay, North Aegean Sea, T & uuml;rkiye. The samples were collected with commercial trawls in Saros Bay from September 2006 to September 2008. A total of 970 specimens were caught at depths of 100-500 m. The average value of fish length was 11.86 +/- 0.14 cm (4.0-22.1 cm), and weight 32.2 +/- 1.0 g (0.83-148.75 g). Otolith size was measured with a minimum of 4.31 mm and a maximum of 12.88 mm. The relationships between TL and TW, OW and OL, OL and TL, OW and TL and OW and OL were determined as TW = 0.010*TL3.10 (r2 = 0.99), OW = 0.0004*OL2.64 (r2 = 0.99), OL = 0.055*TL + 0.564 (r2 = 0.98), OW = 0.0002*TL2.38 (r2 = 0.98), and OW = 0.0004*OL2.64 (r2 = 0.99). The high correlation coefficients (r(2) values) demonstrate the reliability of the established equations, offering a robust framework for estimating the size and weight of this species based on otolith measurements. This study provides crucial insights into the growth patterns and morphometric relationships of Hoplostethus mediterraneus, which can be used to enhance fishery management and conservation efforts in Saros Bay.Öğe Length-Weight Relationships of three Fish Species in the Sea of Marmara, Turkey(Springer International Publishing Ag, 2018) İşmen, Ali; Ihsanoglu, Mukadder Arslan; Inceoglu, HasimLength-weight relationships (LWRs) are investigated for three fish species which sampled with a beam trawl between September 2011-July 2014 in the Sea of Marmara, Turkey: Callionymus maculatus (Rafinesque, 1810), Gaidropsarus biscayensis (Collett, 1890) and Lepidorhombus boscii (Risso, 1810). The data of length-weight relationship were found with W=0.0042*L-3.13(n=20), TW=0.0090*TL2.74 (n=120) and TW=0.0108*TL2.92 (n=19), respectively. According to LWRs results C. maculatus showed positive allometry, G. biscayensis presented negative allometric growth and L. boscii isometric growth. The information about this issue are reported for the first time in the Sea of Marmara for such species. In this way this study is important with new results.Öğe Marmara ve Ege Deniz’lerindeki İzmarit balığı’nın (Spicara maena Linnaeus, 1758) yaş ve büyüme özellikleri(2016) Saygılı, Burak; İşmen, Ali; Ihsanoglu, Mukadder ArslanBu çalışmanın amacı Marmara Denizi ve Ege Denizi'nde Spicara maena'nın bazı populasyon parametrelerini belirlemekti. S. maena örnekleri Şubat-Ekim 2013 tarihleri arasında ticari balıkçılık, fanyalı ağlar ve olta balıkçılığı ile Kuzey Ege Denizi (Dikili, Altınoluk ve Küçükkuyu) ve Marmara Denizinden (Karabiga, Bandırma ve Tekirdağ) elde edilmiştir. Çalışmada elde edilen toplam 323 adet S. maena bireyine ait total boy değerinin 8.4-18.4 cm arasında olduğu belirlenmiştir. Boy-ağırlık ilişki parametreleri Marmara Denizi için a=0,003, b=3,532 ve Kuzey Ege Denizi için a=0,010, b=3,063 olarak hesaplamıştır. Buna göre S. maena'nın Kuzey Ege Denizinde izometrik ve Marmara Denizinde ise pozitif allometrik büyüme özelliği sergilediği görülmüştür. Marmara Denizindeki bireylerin 1-4 yaş arasında ve Kuzey Ege Denizindeki bireylerin ise 2-6 yaş arasında dağılım gösterdiği belirlenmiştir. Her iki cinsiyet dahil olmak üzere von Bertalanfy büyüme parametresi değerleri Marmara Denizinde L?=17,17 cm, k=0,52 yıl, t0=-1,04 yıl-1 ve Kuzey Ege Denizinde L?=18,71 cm, k=0,35 yıl, t0=-1,98 yıl-1 olarak hesaplanmıştır. Otolit boyu-total boy ilişkisi Marmara Denizi için OL=0,301×TL+1,049 ve Kuzey Ege Denizi için OL= 0,249×TL+1,885 olarak tahmin edilmiştirÖğe Otolith morphometry and population parameters of red porgy, Pagrus pagrus (Linnaeus, 1758) in Saros Bay (North Aegean Sea)(2013) İşmen, Ali; Ihsanoglu, Mukadder Arslan; Gül, Güzin; Yıgın, C. CigdemBu çalışmada, Kuzey Ege Denizi’nde (Saroz Körfezi) Fangri balığının toplam boy (TL) ile toplam ağırlık (TW) arasındaki ilişki, yaş, büyüme ve otolit boyu (OL) - otolit ağırlığı (OW), balık boyu (TL) - otolit boyu (OL), balık ağırlığı (TW) - otolit boyu (OL), otolit boyu (OL) - otolit genişliği (OWi) arasındaki morfometrik ilişkiler incelenmiştir. Toplam 100 adet balık üzerinde yapılan ölçümlerde minimum boy 9,6 cm, maksimum boy 44,4 cm; minimum ağırlık 17,1 g, maksimum ağırlık 1372,5 g olarak tespit edilmiştir. Otolit ağırlığı minimum 0,0181 g, maksimum 0,1456 g; otolit boyu minimum 0,52 cm, maksimum 1,17 cm olarak ölçülmüştür. Boy-ağırlık ilişkisi TW=0,021*TL2,885 (r2=0,98), otolit boyu - otolit ağırlığı OW=0,105*OL2,609 (r2=0,92), toplam boy - otolit boyu OL=0,024*TL+0,249 (r2=0,83) otolit boyu - toplam ağırlık OL=0,235*TW0,237 (r2=0,81) otolit boyu - otolit genişliği OWi=0.501*OL+0.116 (r2=0.832) ilişkileri tespit edilmiştir. En büyük yaş 9 olarak belirlenmiş, von Bertalanffy büyüme parametreleri L?=51,59 cm, K=0,12 yıl-1ve t0= -1,13 yıl olarak hesaplanmıştır.Öğe POPULATION STRUCTURE OF WEDGE CLAM, DONAX TRUNCULUS (BIVALVIA, DONACIDAE), IN THE SOUTHERN SEA OF MARMARA, TURKEY(Parlar Scientific Publications (P S P), 2019) Colakoglu, Serhat; Yildirim, Pinar; Cardak, Mine; Ihsanoglu, Mukadder ArslanThe growth, reproduction, and density of wedge clam (Donax trunculus) were studied at a depth of 0.5-2 m in Denizkent in the Southern Sea of Marmara, Turkey. Samples were collected monthly between May 2017 and July 2018. The average density of the studied population ranged between 118 individuals m(-2)(November) and 245 individuals m(-2) (July). von Bertalanffy growth parameters using the length-frequency distribution of Donax trunculus were estimated at L-x = 43.85 mm and the rate at which the asymptotic length (L-x) is approached (K) = 0.73y(-1). The slowest growth period was in Janu- ary. Growth performance index, potential longevity and maximum length derived from seasonal parameters were calculated as 3.15, 4.11 y and 42 mm, respectively. The growth pattern showed negative allometric growth (slope [b] = 2.71), the spawning period occurred from April to July and peaked between May and June.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.Öğe 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 ArslanIn 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.
