Intensive rearing of early stages of cyprinid fish under controlled conditions
2005
Wolnicki, J. (Inland Fisheries Institute, Olsztyn (Poland). Dept. Pond Fisheries), E-mail: [email protected]
The data on the effects of water temperature and different diets and feeding techniques on early stages of 26 cyprinid fish species, reared under controlled conditions, were summarized. The experimental data on larval and juvenile growth, survival and biological quality characteristic were discussed. It was concluded that the optimum growth temperatures (OGT) for larvae and the earliest juveniles belong to the range of 25-35 deg C, whereas most of experiments with those fish were performed at 20-25 deg C. The best larval relative growth rates were found for live food-fed common carp (maximum RGR25 greater 50 percent d-1), as compared to the data for this and other species fed the same diet or exclusively starters or their combinations with natural food. At the very beginning of exogenous feeding, before being weaned to exclusively starters, most of cyprinid species require natural food for high survival or fast growth or both, mostly for approximately 5 days. To avoid decline of their biological quality (e.g. external abnormalities, lower stress resistance), starter-fed juvenile cyprinids seem to require small supplements of natural diets or should be fed with starters below satiation level what is 2-2.5 percent of their total biomass daily
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