Spaho Enton

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EVALUATION OF SOME INDICATORS OF GROWTH OF RAINBOW TROUT (ONCORHYNCHUS MYKISS WALBAUM, 1792) IN CASES OF APLICATION OF THREE ALTERNATIVE METHODS OF FEEDING

Spaho Enton, Sadikaj Rigerta, Arapi Dritan, Sallaku Enkeleida, Bllaca Marsida

Abstract
Three groups of rainbow trout were fed for 75 days with a commercial diet using the manual way of giving the food and its distribution with equipments Demand Feeder and Belt Feeder. Executing mathematical models of calculating, values of allometric coefficient b in length-weight report, condition factor (K) according to Fullton and specific rate of growth (SRG) are determined. The values of coefficient b were allometric positive for the trouts of two experiment groups (b=3.065 for the trouts that took the food at request, and b=3.120 for those that took the food from equipment Belt Feeder) and allometric negative for the trous of control group (b=2.902). The K and SRG values for the trouts that took food from equipment Demand Feeder, for them fed using equipment Belt Feeder and for trouts of control group were respectively 1.113 and 1.8, 1.111 and 1.79, 1.094 and 1.68. The group of trouts that took the food at request had the higher values of growth index.

Key words: rainbow trout, diet, growth index, equipments