The effects of some fodder additives on the growth and consumption indices of brook trout (Salvelinus fontinalis M.).

The aim of this study was to follow the effects o f Bio-Mos, NuPro and SelPlex on the production indices of brook trout. The experime nt had been carried out during August 2008 - April 2009 (250 days) at the trout farm ICAS Gilau, situated in Cluj County. Four batches were implied: a Control batch and three experimental bat ches (Bio-Mos 0.2 %, NuPro 2 % and SelPlex 0.03%) each of them consisting of 250 brook trout j uveniles. The experiment took place in four concrete tanks, which offered the same rearing cond itions (the same water quality, rearing density, feeding hours, food quantity). The experimental bat ches received 0.2% Bio-Mos, 0.03% SelPlex and 2% NuPro, and at the end fish reached an average weight of 238.55 g/specimen and a survival rate of 82.8% for Bio-Mos batch, 212.2 g/specimen and a survival rate of 94.4% for SelPlex batch and 225.25 g/specimen and a survival rate of 80% for the NuPro batch comparatively to the Control batch where an average weight of 204.65 g/specimen and a survival rate of 77.28% had been registered.