Dietary effects on tissue composition, oogenesis and the reproductive performance of female rainbow trout (Oncorhynchus mykiss)
1990; Elsevier BV; Volume: 90; Issue: 2 Linguagem: Inglês
10.1016/0044-8486(90)90340-s
ISSN1873-5622
AutoresBarbara Shayne Washburn, David J. Frye, Silas S.O. Hung, Serge I. Doroshov, Fred S. Conte,
Tópico(s)Fish Ecology and Management Studies
ResumoOne hundred and eighty 2-year-old female rainbow trout broodfish were fed a low protein, high carbohydrate (LP), intermediate protein and carbohydrate (IP), or a high protein, low carbohydrate (HP) diet for 9 months to determine the effect of the diets on ovarian development, body proximate composition, and reproductive performance. Dietary treatment did not have any effect on the histomorphology of ovarian development. However, during vitellogenesis (July until November), fish fed different diets had significantly different body and carcass weights, plasma glucose, and plasma vitellogenin levels. Although there were some differences between the three treatments in the proximate composition of gonads, liver, and gastrointestinal tract during the reproductive cycle, no consistent pattern was seen. At spawning, LP fish retained a higher amount of lipid in the ovaries and gastrointestinal tract than the other two groups. Although the egg proximate composition was the same regardless of diet, eggs from fish fed the LP and IP diets had significantly higher survival (P<0.05) to the eye-up stage, hatchability, and relative fecundity than HP fish.
Referência(s)