Published in Scientific Papers. Series D. Animal Science, Vol. LXIV, Issue 1
Written by Lorena DEDIU, Angelica DOCAN, Iulia GRECU, Mirela CRETU, Daniela IBĂNESCU, Cristian RAMNICEANU, Victor CRISTEA
The main purpose of the present experiment is to evaluate if the growth performance, feed utilization and survival rate of rainbow trout (Oncorhynchus mykiss) fingerlings are influenced by factors such as initial stocking size, stocking density, diet or their interaction. This study was based on a 3x3x2 factorial design with three rearing densities (D1 = 2.61±0.22 kg/m3, D2 = 3.90 ±0.06 kg/m3 and D3 = 4.80±0.08 kg/m3), three size classes (SC1 = 2.22±0.24 g/ex, SC2 = 4.90 ±0.18 g/ex and SC3 = 6.87±0.016 g/ex) and two levels of dietary protein (LP = 45%, HP = 50%). After an experimental period of 70 days, rainbow trout growth performance was evaluated through analysis of various technological indicators: IWG (individual weight gain), FCR (food conversion ratio), SGR (specific growth rate), Relative Growth Rate (RGR), PER (protein efficiency ratio). The statistical analysis of data showed significant differences regarding growth among variants both in terms of density and size class. Diet and fish size factors, and the interaction between these, contributed significantly to the variation in protein efficiency ratio.
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