TECHNOLOGY OF ENRICHMENT OF YOUNG ARTEMIA NAUPLII AND EFFICIENCY OF THEIR USAGE AS STARTING FEEDS

Abstract

Enrichment of artemia with biologically active substances has three main ways - through the intestines, gills and integuments. The possibility of enrichment of artemia through the body integuments exists only for the first two days after hatching, when nauplii have soft and thin integuments. Enrichment through the intestines becomes possible only at the stage of metanauplii, which comes after the first molting when the mouth appears and the digestive system is formed. We chose enrichment through the skin of nauplii of the 1st development stage, since early nauplii are an ideal food for fish larvae at the stage of transition to exogenous feeding. The purpose of the research is to develop enrichment technology and to obtain live starting feeds with the vitalizer properties containing biologically active substances: adaptogens, probiotics, a vitamin and amino acid complex that heal the fish body, form intestinal microbiocenosis, increase growth and development rate, endurance, resistance to psychogenic and oxidative stress, increase survivability, reduce the level of cannibalism. As a result, we obtained Artemia nauplii enriched with Sporothermin probiotic, Irkutin adaptogen, Chiktonik vitamin-amino acid complex, which were used to rear larvae and fry of the African catfish. The results of the studies showed that usage of enriched nauplii accelerates fish growth, increases the proportion of "giants" with a mass more than twice the average for the population, reduces the level of cannibalism, increases survivability of fish, retaining these tendencies throughout the entire rearing period.