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Turkish Journal of Fisheries and Aquatic Sciences 2012, Vol 12, Num, 1     (Pages: 127-133)

The External Abnormalities of Hatchery-Reared Black Sea Flounder (Platichthys flesus luscus Pallas, 1814) in Turkey

İlhan Aydın 1

1 Central Fisheries Research Institute, Pbox. 129, Trabzon, Turkey DOI : 10.4194/1303-2712-v12_1_15 Viewed : 1793 - Downloaded : 1444 This study was designed to describe the occurence of external abnormalities in Black Sea flounder (Platichthys flesus luscus) reared in captivity. In the present study, a total of 2187 juvenile fish were examined. Eight hundred eighty eight Platichthys flesus luscus had one or more of the following conditions: reversed (sinistral), malpigmentation, malformed jaw, incomplete eye migration. Average total length and body weight of abnormal juveniles were significantly lower than that of normal juveniles (P < 0.01). During the intensive rearing of flounder, upper jaw deformities (55%) were the most commonly observed types of deformation. Aproximately 1.9% of deformed juveniles had incomplete eye migration which acquired the lowest total length and body weight. More than half (54.9%) of the individuals analyzed showed more than one deformity. Keywords : Flounder, Platichthys flesus luscus, abnormality, malpigmentation