ISSN:
1365-2109
Quelle:
Blackwell Publishing Journal Backfiles 1879-2005
Thema:
Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
Notizen:
Abstract. In southern Africa rainbow trout, Oncorhynchus my kiss (Walbaum), are generally cultured at temperatures between 18 and 22°C, which is higher than the optimal thermal range for maximum growth in this species. Experiments were undertaken on two size classes of fish (〈4·5g and 〉25g) to determine the gross changes in protein and lipid requirements at these temperatures. The optimal protein and lipid requirements of the smaller fish were found to be 40% and 20–30% of the diet respectively. These levels are significantly different to those under optimal thermal conditions. The protein requirements of the larger fish remained at the ‘threshold level’ of 35% of the diet, although lipid requirements rose lo between 20 and 23% of the diet. The results are discussed in terms of the animal's scope for growth.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1111/j.1365-2109.1992.tb00604.x
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