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    Öğe
    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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    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 Arslan
    The 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.
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    Öğe
    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.