Investigation of relationship between some biological characteristics of female broodstocks with hatching, survival and early growth in rainbow trout (Oncorhynchus mykiss) larvae

نویسندگان

  • Dadgar, Sharam
چکیده مقاله:

In regarding to study the effect of biological parameters of female rainbow trout (Oncorhynchus mykiss) brood stocks on girt, 30 specimen of rainbow trout brood stocks were selected from 3 different age class (3, 4, 5 years). The results showed, maximum of girt 36.35± 0.35cm , ovary weight 600±11.25 gr, hatching 90±4 % and larvae weight after hatching 0.15±0.01 were in 5 and 3 years old brood stocks, respectively. The results  showed significant  differences between 3,4 and 5 years old  brood stocks for this instances (P<0.05). Maximum of number of eggs in each gram 15±0. 26 Registered in 3 and 5 years old brood stocks, respectively. Maximum absolute fecundity, relative fecundity, and working fecundity were recorded in 4 and 3 years old brood stocks, respectively. The study pointed significant difference between investigated brood stocks (p<0.05). Maximum of larvae survival percentage were observed in 4 and 3 years old brood stocks, respectively. The results showed no significant difference between 5 and 3 years old brood stocks, but for 4 and 5 years old brood stocks was saw significant difference (P<0.05). Maximum of gonadosomatic index were observed in 5 and 3 years old brood stocks, respectively. Although gonadosomatic index between 4 and 5 years old fish showed no significant difference, but the study showed significant difference for 3 years old brood stocks (P<0.05).

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عنوان ژورنال

دوره 6  شماره 3

صفحات  93- 101

تاریخ انتشار 2016-04

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