Published in Scientific Papers. Series D. Animal Science, Vol. LXV, Issue 2
Written by Nicoleta-Georgeta DOBROTĂ, Gheorghe DOBROTĂ, Victor CRISTEA, Mioara COSTACHE
The survival rate of one summer old pike-perch’s (Sander lucioperca L., 1758) during the cold season is low (50-75%) due to lower temperatures which lead to a decrease in metabolism. The feed sources are becoming scarce and, as a result, the fish are consuming their adipose tissue accumulated during the warm season, becoming prone to disease due to weight loss. The research was carried out during 2018, 2019 and 2020 years at the Fish Culture Research and Development Station, Nucet. The fish wintering was done in ponds, in two experimental versions: Variant 1 - no feed was administered and Variant 2 - live food was administered (fish species without economic importance). The experiments for each variant were performed in three densities, as follows: 200 kg/basin (2000 kg/ha), 500 kg/basin (5000 kg/ha) and 700 kg/basin (7000 kg/ha). The best results for survival rate were obtained in variant 2 in 2020 at 200 kg/basin density, with a 98.8% survival rate. The weight gain rate in variant 2 for 2018 at 500 kg/basin density, obtained a growth rate of 137 kg/wintering season.
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