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    Effect of shell height on the reproductive success and survival of cornu aspersum (O. F. Müller, 1774)
    (BIOFLUX SRL, 2018) Çelίk, M. Yeşim; Duman, Mehmet Bedrettin; Sariίpek, Merve; Gören, Gülşen Uzun; Öztürk, Dilara Kaya; Karayücel, Sedat
    The study was carried on Cornu aspersum (synonym: Helix aspersa) in the Black Sea region, Turkey. The snails were placed in two separate treatments called G1 (28.00-33.99 mm) and G2 (34.00-39.99 mm) at the artificial hatchery. Mean shell height and live weight were 32.22±0.06 mm and 8.96±0.07 g in G1; 35.40±0.06 mm and 11.76±0.09 g in G2, respectively. The spawning rate in G1 was lower than G2 (p ≤ 0.05). The survival rate was 78.18% in G1 and 81.14 % in G2 after spawning; 86.63% in G1 and 94.12% in G2 after hibernation, respectively. The mean egg weight was 0.04 g in G1 and 0.05 g in G2 while the shell height and live weight of juvenile were 5.56±0.05 mm and 0.06g in G1; 5.81±0.07 mm and 0.07 g in G2, respectively. The results showed that larger eggs were laid by bigger size adults and after hatching bigger size juveniles were obtained due to larger egg diameter. In addition, the results of experiment confirmed the hypothesis suggested about survival that newly matured individuals could have insufficient energy reserves while larger ones can not withstand the excess energy for reproduction. Thus, the body size of C. aspersum is correlated with reproductive performance and survival rate. © 2018, BIOFLUX SRL. All rights reserved.
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    Risk assessment of elements in muscle of two biomonitored fish species from the southern Black Sea
    (Elsevier, 2023) Bat, Levent; Öztekin, Ayşah; Öztürk, Dilara Kaya; Arıcı, Elif; Şahin, Fatih; Hasançavuşoğlu, Zeynep
    Trace elements (Cd, Hg, Pb, Cu, Zn, and Fe) concentrations in the muscle of Mullus barbatus (red mullet) and Merlangius merlangus (whiting) were measured by inductively coupled plasma mass spectrometry from the southern Black Sea. Fe showed the highest amount in edible tissues of both fish species followed by Zn and Cu. The lowest element measured was Cd, followed by Hg and Pb. Element amounts in edible tissues were compared with national and international permissible limits and were within the permissible safety levels for human consumption. The risk assessment, related to the consumption of red mullet and whiting, was implemented, considering the concentrations of six metals, the estimated weekly intake (EWI), the provisional tolerable weekly intake (PTWI), the target hazard quotient (THQ), hazard index (HI), and risk index (RI). The HI values for both red mullet and whiting were found to be less than one, indicating that eating these fish poses no health risk. Moreover, RI due to Pb exposure through fish consumption may also have no chance of contracting cancer in the future. © 2024 Elsevier Ltd. All rights reserved, including those for text and data mining, AI training, and similar technologies.