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    Mollusc fauna of Kemer Bay (Sea of Marmara)
    (Ege Univ, Fac Fisheries, 2022) Bitlis, Banu; Ozturk, Bilal; Sen, Yusuf
    In the present study, mollusc species distributed in the Kemer Bay (Sea of Marmara) were determined seasonally (November, February, May, and August) in the years 2010 and 2011. The benthic samples were collected from different biotopes in 16 stations at depth ranging between 0.2 and 5 m by using a quadrate sampling gear. As a result of the evaluation of collected benthic materials, a total of 66 mollusc species belonging to 3 classes (Polyplacophora, Gastropoda, and Bivalvia) were identified. When the number of species and individuals are compared based on the seasons, maximum number of species (46 species) and individuals (168825 ind. m(-2)) were counted in autumn and spring, respectively. Mytilus galloprovincialis (Lamarck, 1819) and Mytilaster lineatus (Gmelin, 1791) were the most abundant species in all the seasons. Whereas, Bittium reticulatum (da Costa, 1778), Rissoa membranacea (Montagu, 1803), and Tricolia pullus pullus (Linnaeus, 1758) were characterized as species having the highest frequency index values in all seasons.
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    Occurrence of the Scavenger Crustaceans Natatolana neglecta (Hansen, 1890) (Isopoda: Cirolanidae) and Scopelocheirus hopei (Costa in Hope, 1851) (Amphipoda: Scopelocheiridae) on Bento-pelagic Fish Species in the Turkish Straits System
    (Inst Zoology, Bas, 2022) Mulayim, Aysegul; Ates, A. Suat; Sen, Yusuf; Ozekinci, Ugur; Acar, Secil
    The scavenger crustaceans Natatolana neglecta (Hansen, 1890) (Isopoda: Cirolanidae) and Scopelocheirus hopei (Costa in Hope, 1851) (Amphipoda: Scopelocheiridae), along with several other peracarid crustaceans, were recorded on demersal fish species in the Turkish Straits System. Samples were collected on (in) Raja clavata, Chelidonichthys lucerna, Trachurus sp., Scorpaena scrofa, Merluccius sp., Solea solea and Squalus acanthias captured by trammel nets at depth of 50 m on 26(th) January 2021. Natatolana neglecta, Scopelocheirus hopei and Nebalia abyssicola Ledoyer, 1997 are new for the fauna of the Turkish Straits System.
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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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    The effect of gillnet twine thickness on catching efficiency and selectivity for common carp (Cyprinus carpio Linnaeus, 1758) fishery in Marmara Lake
    (Ege Univ, Fac Fisheries, 2022) Dereli, Hakki; Kebapcioglu, Turhan; Sen, Yusuf; Olcek, Zeki Serkan; Dincturk, Ezgi; Ulman, Aylin
    The effects of multifilament gillnet twine thickness on selectivity and catching efficiency for the common carp fishery were investigated in this study. Sampling was carried out with multifilament gillnets of two different twine thicknesses (with 210d/2 and 210d/3) on 140, 150, 160, 180, 200 mm mesh sizes between June 2015 and December 2016 in Marmara Lake, located in Western Turkey. Higher modal lengths and lower catch per unit effort (CPUE) values and lower sub-minimum landing size (MLS) individuals rate (excluding 180 and 200 mm mesh sizes) were obtained in the thick multifilament material (210d/3) with the same mesh size compared to thin material (210d/2). All mesh sizes in both twine thickness provided modal lengths above the MLS. However, the thin twine material had a higher nominal percentage of undersized fish (8%), greater than the 5% accepted limit for total catches when all mesh sizes are considered together. As a result, the modal lengths and spread values increased and the selectivity and catching efficiency decreased with the thicker twine material.