Rearing and Spawning of Black Sea Turbot, Psetta maxima
Hara, M. Özongun, E. Güneş, B. Ceylan-2002
Journal of Fisheries and Aquatic Sciences, 2: 9-12
Broodstock development and induction of spawning of Black Sea turbot, Psetta maxima has been conducted between 1998 and 2001 in the Central Fisheries Research Institute, Trabzon, Turkey. One of the environmental and feeding conditions evident in broodstock management is the optimum water temperature below 17°C which is the present culture condition at the Institute. Likewise, frozen whiting is considered to be a good broodstock diet from the viewpoint of nu-tritional and ecological aspects. Growth of hatchery-bred broodstock fed this diet is shown as the relationship of body weight to age (month) represented as an equation of: y = 0.072 x + 0.164 (R² = 0.998).
Natural spawning was observed for 2-year-old hatchery-bred stock at water temperature of 14°C, however, no spawning was observed by the same broodstock at 3-years of age. On the other hand, induction of spawning for wild-caught broodstock were established through hormonal treatment.
A total of 78 artificial inseminations for 61 wild-caught females were carried out between 1998 and 2001spawning season (April and May). An average yearly production of 1.96 million newly hatched larvae was recorded with an average fertilization rate of 39.5% and a mean hatching rate of 32.5%.
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