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Turkish Journal of Veterinary & Animal Sciences

DOI

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Abstract

In this study reproductive performance of female rainbow trout broodstock ( Oncorhynchus mykiss) in a commercial trout farm in Eastern Black Sea Region were evaluated during 1995 spawning season. Mean total and relative fencundity values were 2304±425 egg/individual and 1364±281 egg/kg, respectively, while mean egg dia meter was 5.2±0.21 mm. Fertilisation rate on average was 73.7% of total fencundity. 84.6% of the fertilised eggs was eyed and 96.0% of those eyed was hatched. Larvae reached free swimming stage after 23 days and survival rate was 98.9% of those hatched larvae. Larvae reached a mean weight of 305±56 mg at 40th and 19.2±5.41 g 133th days after hatching. There was significant but weak positive relationship between female weights - fecundity and egg diameter, while the relationships between fertilisation -eyeing, hatching and free swimming rates were strong. It has been concluded that reproductive values determined during this study seems to be quite satisfactory for a typical commercial trout farm which has not got any broodstock management stragety, but it is possible to increase these values.

Keywords

The Rainbow trout, Oncorhynchus mykiss, Broodstock, Fecundity, Egg and larval quality.

First Page

489

Last Page

496

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