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Turkish Journal of Fisheries and Aquatic Sciences 2010, Vol 10, Num, 3     (Pages: 387-394)

Eggs Incubation, Early Development and growth in Frys of Brown Trout (Salmo trutta macrostigma) and Black Sea Trout (Salmo trutta labrax)

Ahmet Alp 1 ,Mesut Erer 1 ,Adem Kamalak 2

1 University of Kahramanmaraş Sütçü Imam, Faculty of Agriculture, Department of Fisheries, 46100, Kahramanmaraş, Turkey
2 University of Kahramanmaraş Sütçü Imam, Faculty of Agriculture, Department of Animal Science, 46100, Kahramanmaraş, Turkey
DOI : 10.4194/trjfas.2010.0312 Viewed : 2273 - Downloaded : 2862 Some of the embryonic development stages and growth of the frys of brown trout (Salmo trutta macrostigma) and Black Sea trout (Salmo trutta labrax) were examined. The first eye pigmentation in the brown trout eggs were realised on the 35 days (244 day-degree) at 7.23°C and 31 days (260 day-degree) at 8.21°C post fertilisation. First eye pigmentation of the Black Sea trout eggs were seen on day 25 (215 day-degree) at 8.21°C. Brown trout larvae were hatched on day 56 (387 day-degree) at 7.23°C and on day 50 (413 day-degree) at 8.21°C post fertilisation. Black Sea trout larvae were hatched on day 53 (440 day-degree). Survival rates in the eyed stages were 84.50% (7.23°C) and 86.65% (8.21°C) and 81.59%. Survival rates in the hatching were 82.27% (7.23°C) and 80.96% (8.21°C) in brown trout and 78.30% in Black Sea trout. Alevins were initially fed with only Artemia naupliii and then were acclimated to the commercially dry feed. The brown trout frys reached from 76.8±6.1 mg to 3527.4±250.3 mg in the period of 111 days. Growth in the frys was the best described using an exponential model and it was W(t)=18.741 x exp(0.0358xAge) (r2= 0.989) for brown trout. The Black Sea trout frys reached form 76.6±3.2 mg to 3,680.2±390.5 mg in the period of 111 days. The exponential growth equation of Black Sea trout frys was W(t)=15.742 x exp(0.0368xAge) (r2= 0.989). Growth in length was fitted to the exponential model and the equations were formed as L(t)=11.240 x exp(0.0124xAge) (r2=0.991) for brown trout frys and L(t)=10.673 x exp(0.0128xAge) (r2= 0.987) for Black Sea trout frys. Incremental growth rates were not different between brown trout and Black Sea trout frys (P>0.05). Keywords : Salmo trutta macrostigma, Salmo trutta labrax, eggs, embryo, fry, growth