Factors for increasing the survival rate of catfish fertilized eggs and larvae

Abstract

The improvement of the quality of eggs, decrease of developmental anomalies, increase of progeny survival rate are urgent problems of industrial fish breeding. We used biologically active agents – vitamins and adaptogens to solve the above problems. Adaptogen trekrezan (ethanolammonium salt of 2-methylphenoxyacetic acid) – a synthetic analog of ginseng – was applied in fish breeding. It does not demonstrate any gonadotoxic, embryotoxic, mutagenic, teratogenic, carcinogenic and allergenic action and is not accumulated in the organism. The agent has high immunotropic activity, stimulates cellular and humoral immune response, phagocytosis, demonstrates interferon inducer activity. We also used vitamin B1 – thiamine. The need for it is the highest in early ontogenesis. It is required for normal functioning of nervous, digestive and cardiovascular systems, hematopoietic system and is considered essential. The study of the influence of thiamine and trekrezan on egg fertilization rate showed that under the influence of these biologically active agents both individually and in a complex the fertilization increased by at least 14%. The study of the influence of thiamine and adaptogen on larvae hatching showed that they can increase the hatching by more than 20%. The study of the influence of thiamine and trekrezan on the level of developmental anomalies of African sharptooth catfish larvae showed that both components reduce this indicator. With the use of thiamine and trekrezan the level of developmental anomalies decreased in all groups by more than 10%. The study was supported by the Russian Foundation for Basic Research, grant No. 18-016-000127.