Reproductive qualities of amur carp females, caviar survival and size-weight indicators of amur carp larvae and amur carp crossbreeds from the belarusian collection herd

The article presents data on the reproductive qualities of the Amur sazan in purebred breeding and when it is used to obtain crossbreeds with collection carp of Belarusian and foreign selection. When forming the first and third reproductions of the ninth generation of the collection Amur carp, imported genetic material (milk) was used. Sazan females were previously genetically labeled for transferrin.
In accordance with the work program, 12 crossings (11 experimental and 1 control) of Amur sazan and carp of different breeds were carried out in order to study the combination ability of hybrids.
Evaluated:
• reproductive qualities of carp females used for caviar production,
• survivability of eggs in various crosses,
• linear dimensions and live weight of larvae of purebred carp and crosses.
The working fecundity of females of the Amur carp averaged 174.72 thousand eggs, with a high level of trait variability: from 121.36 to 225.49 thousand eggs. 
The average fertility of pure breeding Amur sazan eggs was 71 %. When hybrids were obtained from sazan females and males of various carp breeds, the proportion of live eggs after one day of development was 82.0 %. When obtaining hybrids from collection females of carp of Belarusian breeds, the proportion of live eggs was 81.7 %, with fluctuations from 67 % (Lakhvinian carp x sazan) to 96 % (three prim carp x sazan). The average value of the fertilization of eggs when obtaining hybrids from collection females of foreign selection carp breeds, with slight fluctuations, was 47.0 %.
The mass of three-day-old sazan larvae averaged 4.0±0.06 mg, purebred carp of different breeds 3.1±0.21 mg, crosses of sazan (♀) with carp (♂) 2.9±0.02 mg, carp (♀) with sazan (♂) 3.2±0.02 mg. The length of three-dayold larvae of sazan was 5.5±0.07 mm, carp 6.7±0.05 mm, crosses of sazan (♀) with carp (♂) 6.1±0.03 mm, carp (♀) with sazan (♂) 6.3±0.06 mm. The largest larva weighing 4.5 ± 0.08 mg was obtained from crossing females of the Isobelinsky breed (layering three prim) with sazan males.
The data obtained are necessary to calculate the required number of spawners to obtain one or another cross and to select a cross with a higher survival rate for stocking commercial reservoirs.

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