[Food effects on some reproductive aspects of rainbow trout, Oncorhynchus mykiss, in a Venezuelan fish farm].
Samples of rainbow trout, Oncorhynchus mykiss, were fed with three different dried diets, labeled D1, D2 and D3, the first ones were expanded and the last one pelleted type food. Their protein content ranged from 36% to 42%, and only D1 diet presented a pigment in its composition. The gonodasomatic index (GSI) as well as the gonadial development showed a different behavior in males and females for all the samples tested. A continuous sperm production was observed in males fish, while in female fish the GSI showed a tendency to increase through the whole study, and they showed a reproductive rest period on july 92. Fish relative fecundity and egg diameter were similar in all cases. The gonodial maduration age was shorter for the female that were fed with D1 and D2, while the 50% of the trout population that got D3 had a gonodial maduration period two months longer. For all trouts tested the fertility was low with a maximum value of 49%. The hatchery from the tested trouts with D2 intakes had a mortality value of 62%. Meanwhile, those with D1 and D3 intakes showed mortality values of 36% and 43% respectively.
Bastardo
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Centro de Investigaciones Agropecuarias del Estado Mérida (CIAE Mérida), Venezuela.
D000821:Animal Feed; D000818:Animals; D005260:Female; D005298:Fertility / Q000502:physiology; D006066:Gonads / Q000254:growth & development; D008297:Male; D017686:Oncorhynchus mykiss / Q000502:physiology*; D010063:Ovum / Q000502:physiology; D012098:Reproduction / Q000502:physiology*; D012661:Semen / Q000378:metabolism; D013696:Temperature