Published in Scientific Papers. Series D. Animal Science, Vol. LXIII, Issue 2
Written by Lyudmila NIKOLOVA, Stanimir BONEV
The study clarifies the growth of Siberian Sturgeon, Russian Sturgeon and their hybrid grown on an industrial cage farm. Three groups within each genotype of male individuals with different initial body weight were formed, as follows: Russian Sturgeon - I - 2.504±0.060 kg; II - 3.042±0.063 kg; III - 3.693±0.074 kg; Siberian Sturgeon - I - 1.395±0.034 kg; II - 2.277±0.065 kg; III - 2.925±0.066 kg; Hybrid (Siberian Sturgeon x Russian Sturgeon) – I - 2.081±0.050 kg; II - 3.049±0.051 kg; III - 3.704±0.058 kg. It was found that in I and II group of Siberian Sturgeon the relative growth for the whole period was practically the same, respectively 59.1 and 57.9%. The fish from group III had a significantly smaller growth (24.6%). In Russian sturgeon, in the case of fish that are growing slower at the beginning of the growing season, a mechanism for compensatory growth is established. The smallest fish grew best at the beginning of the period and the second and the fish from third group grew at the end of the growing season. In this species, the total relative growth in group I was 39.5%, group II - 15.2%, group III - 12.0%. The relative growth over the whole period in the hybrid of I, II, III groups was 75.3%, respectively; 23.7%, 26.7%.
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