engleski

Some observations on the growth of juvenile amberjack (Seriola dumerili, Risso, 1810) in cage rearing from the southern Adriatic Sea

The growth rate of the few months old Mediterranean amberjack was studied throughout a period of one year in the Bay of Mali Ston. Sixty-nine fish with an average weight of 183 (SD=57.5) g and total length of 25.2 (SD=2.8) cm were settled in rearing cages (5x5x5m) on September 27. 1995 for the purpose of studying growth in weight and length. The fish were usually fed frozen sardines once a day, every other day. The first month of rearing the fish showed considerable growth in weight 328 (SD=92.7) g and length 28 (SD=2.5 cm). At the end of the one-year period, the reared fish averaged 1239 g (SD=129, 8) in weight and 47.8 cm (SD=1.7) in length. The condition factor throughout the etire period of rearing was relatively homogenous, at 1.38 (SD=0.15). Significant gains in the weight and length of fish can be noticed during the warmer periods of the year, while less are for the colder months. The fish preferred frozen sardines. During this experiment, we noted the mortality of 7 fish (10, 1%). Moreover, the sudden oscillations in the basic hydrographic parameters for this relatively enclosed bay can be attributed to the influence of th river Neretva.

Seriola dumerili; cage rearing; growth; Adriatic sea

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