Evaluation of selected feeds differing in dietary lipids levels in feeding juveniles of wels catfish, Silurus glanis L.
2008
Mazurkiewicz, J. | Przybyl, A. | Golski, J.,University of Life Sciences, Poznan (Poland). Div. of Inland Fisheries and Aquaculture
The feeding trial (60 days) was carried out with the fry of wels catfish (Silurus glanis L.), weighing on average 55 g. The experiment was conducted under controlled conditions in an aquarium hall in 60-L flow-through tanks. During the growth test, the fish were given four commercial feeds of the same protein amount (45 percent) and graded fat levels (15, 20, 25, and 30 percent). In the final evaluation of the feeding tests, the following rearing effectiveness indices were used: food conversion ratio (FCR), specific growth rate (SGR), protein efficiency ratio (PER), protein retention (PR), lipid retention (LR), and survival rate (SR). The wels catfish fed 20 percent-fat-content feed attained the highest individual weights. The species requirement for dietary lipids would be of prime interest for fish farmers to use balanced feed optimized for particular fish stages
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