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Carp of the initial individual weight of 1020 g (+55 g) were fed in cages with four kinds of extruded, isoprotein feeds differing in the lipid content (7.5% in feed A, 11.6% in feed B, 15.3% in feed C, and 19.5% in feed D). The main source of lipids was a poultry fat. After the completion of the 52-day-long experiment the following values of the SGR and FCR indices were achieved (respectively): A-1.59 and 1.58, B-1.47 and 1.42, C-1.59 and 1.30, and D-1.59 and 1.29. The stage results, calculated every 7 days, as well as, the above-mentioned final values f FCR and SGR indicated, that throughout the entire period of study, the most favourable results of rearing were achieved while feeding the carp with the feed containing 15.3% of lipids, regardless of the water temperature, which ranged from 22.0-30.0°C at the time of the experiment.
Carp of the initial individual weight of 30 g/ind. (±5 g) were fed for 83 days with three kinds of extruded, isoprotein (47.5%) feeds differing in the lipid content (9.1%, in feed A, 12.9% in feed B, and 17.0% in feed C). The main source of the lipids was a poultry fat. After the completion of the experiment the following values of the Specific Growth Rate, SGR index were achieved (respectively): 2.45, 2.75, 2.59% The values of Food Conversion Ratio, FCR were as follows: 1.27, 1.10, 1.21, while the Energy Retained index was respectively: 23.7, 29.6, and 26.6%. In the present experiment consisting in feeding the carp fry in the conditions of cooling water at 13.1-31.2°C, the most favourable results of rearing were achieved using the extruded feed containing12.9% of lipids. The lipids consisted of 2/3 of poultry fat and 1/3 of structural fish fat.
The present study was conducted on two-year-old carp, reared in the production-scale conditions. The fish were kept for 62 days in cooling water and fed feeds differing in the fat content (35.9% of the energetic value of the diet) and carbohydrate content (35.6% of the energetic value of the diet). The experiment resulted in statistically significant differences in the levels of glucose, lipids, and blood lipoproteins as well as in the body composition of the fish in relation to the pre-experiment values and in relation to the other nutritional groups.
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