Survival Rates of Black Sea
Turbot (Psetta maxima maeotica,
L. 1758) Broodstock Captured by Gill Nets from Different Depths and their
Adaptation Culture Conditions
F. Basaran, N. Samsun-2004
Aquaculture International, 12(3):
321-331
Abstract:
A study was performed during Spring 2002 to determine
the survival rates of Black Sea Turbot (Psetta
maxima maeotica)
broodstock captured by gill nets from different depths (≤20
m, 20–45
m, and ≥45
m) in Sinop Bay (Black Sea, Turkey) and their adaptation to culture
conditions. The weight of captured females ranged between 1.6 and 5.5 kg,
while males ranged between 1.1 and 3.7 kg. Within 23 h of capture the fish
were transported to Çanakkale
(Marmara Sea, Turkey). During transportation, the stocking density ranged
from 19 to 40 kg/m3 and no mortality was recorded. At the end of
the fishing operations, the survival rates were calculated for Group 1 (≤20
m), Group 2 (20–45
m), and Group 3 (≥45
m) as 24.9, 71.4, and 92%, respectively. There were significant differences
(p
< 0.05) between the survival rates of the groups. Eggs and sperms were
obtained by hand-stripping. The mean fertilisation rate of the eggs was
3.19%. This low fertilisation rate was due to overripened eggs. At the end
of adaptation period of 1 month, the survival rates of the broodstock were
found to be 14.2, 45.4, and 48.3% for Groups 1, 2, and 3, respectively. No
significant difference was found between the survival rates of the broodfish
during the adaptation period (p
>
0.05).
(Aquaculture
Department, Fisheries Faculty, Ege University, 35440, Iskele-Urla, Izmir,
Turkey; (e-mail: basaran@sufak.ege.edu.tr;
phone: +90-232-7521162; fax: +90-232-7521161)