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Experiments were conducted throughout 2009 and 2010. At the beginning of experiments, both in 2009 and in 2010, were formed two groups (M-control group; E-experimental group), each group far 600 rainbow trout (Oncorhynchus mykiss). Control group M has been exploited in the Fiad trout farm, Bistriţa-Năsăud County, and the experimental group E was operated in a recirculating system arranged in Cluj-Napoca. Experiments were conducted over 210 days, both in 2009 and in 2010. Initial body weight of the specimens was 22.70±0.40 g – group M, and 22.68±0.39 – group E, in 2009. In the second experimental series (2010), the initial body weight of the rainbow trout specimens was 22.69±0.28 g – group M, respectively 22.56±0.31 g – group E. To determine the body size indices, we made measurements and weighings in all age groups exploited. Based on measurements, we calculated: K – Fulton condition factor; Ig – thickness factor; Ip – profile indices; Ica – quality indices; Ic1-meat index expressed as percentage of head lenght from standard lenght of fish; Ic2- meat index expressed as percentage of caudal peduncle lenght from standard lenght of fish. Analysing the value of body size indices in rainbow trout in the two test series (2009 and 2010) we found that they are directly proportional to fish weight, but are significantly influenced by the environmeltal conditions and the feeding rate. The mean values of body size indices (K, Ip, Ig, Ica, Ic1 and Ic2) in rainbow trout from the two experimental series, fall within the range cited in the special literature.

Experiments were conducted throughout 2009 and 2010. At the beginning of experiments, both in 2009 and in 2010, were formed two groups (M-control group; E-experimental group), each group far 600 rainbow trout (Oncorhynchus mykiss). Control group M has been exploited in the Fiad trout farm, Bistriţa-Năsăud County, and the experimental group E was operated in a recirculating system arranged in Cluj-Napoca. Experiments were conducted over 210 days, both in 2009 and in 2010. Initial body weight of the specimens was 22.70±0.40 g – group M, and 22.68±0.39 – group E, in 2009. In the second experimental series (2010), the initial body weight of the rainbow trout specimens was 22.69±0.28 g – group M, respectively 22.56±0.31 g – group E. As factors which influencing directly the growth dynamic of rainbow trout, were monitored the physico-chemical parameters of water from the two locations, and feed consumption. Production performances of the trout from the two experimental groups, were assessed using as indicators total weight gain (TWG) and specific growth rate (SGR). In 2009, TWG=370.92±4.37 g – group E vs. 79.59±1.09 g – group M (p

In this experiment we followed the influence of growth system on the share of internal organs and viscera by the total body mass on rainbow trout (Oncorhynchus mykiss). The importance of this study results from the need to reach as favourable slaughter yield. For this, were slaughtered 25 rainbow trout from the Fiad trout farm (conventional farm), Bistriţa-Năsăud County (control group – M), respectively 25 rainbow trout grown in a recirculating system arranged in Cluj-Napoca (experimental group – E). Body weight of the studied specimens was 228.96±1.21 g – M group, respectively 229.40±1.24 g – E group, the difference between the two groups being insignificant (p>0.05). The slaughter yield was favorable for E group – 90.55±0.03%, compared with M group – 89.23±0.05% (p

Slaughter yield is one of the most important indices of meat production, which in the current legislation, dealing with employment în quality classes and to establish the commercial value of fish or other animals. To make our research, were slaughtered by mechanical stunning, 25 rainbow trout (Oncorhynchus mykiss), from Fiad trout farm, Bistriţa-Năsăud County (M group), respectively 25 rainbow trout from an recirculating system arranged in Cluj-Napoca (E group). The average weight of the studied specimens was similar (228.96±1.21 g-M group, respectively 229.40±1.24 g-E group; d= -0.44 g, p>0.05). Slaughter yield obtained in the goup M was 89.23±0.05%, and in the group E 90.55±0.03%. Results showed that in gravimetric terms, the differences are insignificant between the two groups (d=3.43 g, p>0,05), but in percentage terms, the differences are negative and very significant (d=1.32%, p