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The monthly distribution of turbot, Psetta maxima, in the east of the Black Sea was examined by analyzing data from research surveys conducted from November 2002 to May 2003. Although the turbot was distributed widely in depths of 20 to 80 m in the east of the Black Sea, the most specimens were found in coastal waters (<60 m deep) and within a temperature range of 8-13°C during survey periods. The average CPUE at a depth of 40 m was higher than those other depth layers. The monthly variation in CPUE was not significant, but significant differences were found between depths. Length frequency distributions of turbot were similar for all seasons but mean sizes were statistically different in depths. [ABSTRACT FROM AUTHOR]

A total of 1926 flounder (Platichthys flesus luscus Pallas, 1811) were caught monthly by bottom trawl in the south-eastern Black Sea from August 1995 to August 1996. Length-weight relationships, age, growth, mortality, condition factor, gonadosomatic index and sex ratio of the samples were investigated. Individuals were composed of 43 (2.23 %) juveniles, 932 (48.39 %) females and 951 (49.38 %) males. Total length and weight of the specimens ranged from 4.5 to 38.2 cm and from 1.61 to 613.96 g. Age distribution of the samples was from 0 to VI. The length-weight relationship was estimated as W=0.012*L2.974 for all individuals, and von Bertalanffy growth parameters were computed as L∞=43.87 cm, W∞=916.87 g, k=0.23 year-1 and t0=-0.59 year. The total (Z), natural (M) and fishing mortality (F) rates, and the exploitation ratio (E) for all individuals were estimated as Z=0.39, M=0.18, F=0.21 and E=0.53, respectively. As a result, it was concluded that there has not been an important fishing pressure on flounder population in the south-eastern Black Sea. The spawning period of the flounder in the south-eastern Black Sea was estimated between October and December. [ABSTRACT FROM AUTHOR]

The monthly distribution of flounder, Platichthys flesus luscus, in the east of the Black Sea was examined by analyzing data from research surveys conducted from January to December in 2003. Although the flounder was distributed widely in depths of 10 to 80 m in the east of the Black Sea, the most specimens were found in coastal waters (<40 m deep) and within a temperature range of 8-17°C during survey periods, and a depth preference of juvenile flounder was below 10 m in the area. The average CPUE at a depth of 10-40 m was higher than at other depth layers. The variation in CPUE was not significant monthly, but significant depending on depths. Length frequency distributions of flounder were similar for all seasons, but mean sizes were statistically different in depths. The spawning of the flounder took place under 80 m deep in the area. [ABSTRACT FROM AUTHOR]