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    Growth and Mortality Rates of Cornu aspersum: Organic Snail Culture System, Black Sea Region
    (Galenos Publ House, 2019) Celik, Meryem Yesim; Duman, Mehmet Bedrettin; Sariipek, Merve; Uzun Goren, Gulsen; Kaya Ozturk, Dilara; Karayucel, Sedat
    The study was aimed to examine a snail organic culture system and describe the cultivation properties of Cornu aspersum. The environmental parameters of the culture system and their effects on the growth and mortality rates of C. aspersum were determined between November 2014-October 2015. Snails were fed Spinacia sp. (spinach), Urtica sp. (nettles), Brassica oleracea sp (cabbage) and formulated diet. The feeding and growth rates increased with increasing temperature. Shell height growth rate was the highest in spring while the live weight growth rate was the highest in summer. Mortality rate of the baby snail was higher between November 2014 and May 2015 due to stress conditions such as handling and varying temperatures during their first stages of life. High mortality observed in adults could be associated with the spawning activity of the matured snails that caused physiological exhaustion. The result showed that the best culture cycle for C. aspersum was from spring to autumn in Black Sea region and in order to prevent postreproductive mortality, snails reached to marketable size should be harvested.
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    Seasonal variation of gender-specific meat yield of freshwater Crayfish (Pontastacus leptodactylus Eschscholtz, 1823)
    (Taylor & Francis Ltd, 2025) Uzun Goren, Gulsen
    The focus of this study was the seasonal and sex-specific variation in meat yield of narrow-clawed crayfish (Pontastacus leptodactylus Eschscholtz, 1823), an important crustacean species for aquaculture and the local market. This popular consumer product has been the subject of much recent research. Crayfish were caught from Cernek lake in October-November and May-June 2021-2022 using a pinter. A total of 400 crayfish were included in the study, of which 224 were male and 176 were female. Important data on crayfish under and above 35 g were obtained. The average meat yield was 15.79% in the period October-November and 15.30% in the period May-June. The average of the total meat yield was 15.55%. As a result of the crayfish meat yield study, 100 g of consumable meat was obtained from approximately 13.17 individuals. Carapace length was found to have a statistically significant coefficient in the determination of total meat yield. The results of the study will support demand increases in the local market and have a beneficial impact on aquaculture businesses.