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    Seasonal abundance and diversity of culturable heterotrophic bacteria in relation to environmental factors in the Gulf of Antalya, Eastern Mediterranean, Turkey
    (Springer, 2015) Cardak, Mine; Ozbek, Elif Ozgur; Kebapcioglu, Turhan
    The abundance of culturable heterotropic bacteria studied on and according to depth levels and seasons in the Gulf of Antalya. Environmental factors were compared regarding culturable heterotrophic bacteria abundance and diversities of bacteria. During the study period (between August 2009 and April 2010, seasonally in the Gulf of Antalya, at six stations and six depth levels (0-20 cm, 10, 25, 50, 100, 200 m). The bacterial isolates were identified in the automated micro identification system VITEK 2 Compact 30 (Biomereux, France). The mean abundance was higher in Sts. D, E and F than Sts. A, B and C, located in the eastern part of the gulf. The mean abundance decreased as the depth level increased. The mean abundance of CHB ranged between 8.15 x 10(6) and 2.54 x 10(8) CFU ml(-1) throughout the year. Abundance of CHB differed according to the variations of biotic and abiotic factors. A total of 27 taxa of bacteria including six bacterial classes were reported in this study as the first records for the Gulf of Antalya. Six bacterial classes: Gamma Proteobacteria (46.81 %), Bacilli (27.66 %), Beta Proteobacteria (12.77 %), Alfa Proteobacteria (6.38 %), Actinobacteria (4.26 %) and Flavobacteria (2.13 %) were determined. The study resulted in increased knowledge on the composition and biochemical response of bacteria isolated from eutrophic and oligotrophic areas. 23 bacteria species belonging to 16 families were reported.
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    Spatio-Temporal Patterns of Abundance, Biomass and Length of the Silver-Cheeked Toadfish Lagocephalus sceleratus in the Gulf of Antalya, Turkey (Eastern Mediterranean Sea)
    (Central Fisheries Research Inst, 2017) Ozbek, Elif Ozgur; Cardak, Mine; Kebapcioglu, Turhan
    The variations in abundance, biomass and length frequency of 811 individuals of Lagocephalus sceleratus (Gmelin, 1789) according to the seasons, locations, and depth levels in the Gulf of Antalya were reported in this study. L. sceleratus was sampled from 61 of 116 hauls of commercial bottom trawl that were realized seasonally between August 2009 and April 2010, at six locations and at six depth levels (25, 50, 75, 100, 150, 200 m). The frequency of occurrence was 56.48% at the depths between 25 and 150 m, but the fish were absent at 200 m. The overall mean abundance was calculated as 136.21 ind./km(2) (11.67 ind./h) and biomass as 15.73 kg/km(2) (1.37 kg/h). The total length (TL) ranged from 11 to 50 cm, and the mean TL was calculated as 19.99 cm. According to the available data, this is the widest depth range of L. sceleratus and the deepest record of the species in the Mediterranean Sea.
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    Öğe
    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.