Ідентифікація небезпечних чинників під час вирощування райдужної форелі в умовах замкнутого водопостачання

Abstract

Identification of dangerous factors for a conditional industrial farm for rainbow trout growing in conditions of Recurculating aquaculture system (RAS) was carried out. During the analysis of dangerous factors, the degree of significant influence and probability of potential dangers were determined. Significant potential hazards have been identified at such technological stages as insemination and incubation of caviar, larval survival, caviar, larvae, young, commodity fish and pedigree.Biological filter is defined as a key link in the RAS the functioning of which effects on the quality and safety of commercial fish. It carries out aerobic and anaerobic processes to remove contaminations in the form of ammonium producing by fish, and carbon dioxide, which is formed from undigested food and feces. There are such dangerous factors on the stage of biological purification of water: biological – possible exceeding the total microbial number (more than 100 CFU/cm3), the number of nitrifying (more than 106 CFU/cm3) and E. coli groupbacteria, the presence of bacteria Pseudomonas aeruginosa; chemical – exceeding the content of nitrates (more than 50 mg / dm3), nitrites (more than 0.5 mg/dm3), pH – above 8.In addition to purely technological, there are additional dangerous factors – related to the functioning of the biofilter, fish feeding and the use of veterinary preparations and disinfectants. The potential hazards identified in the work are important to be taken into account in the process of implementation of Rainbow Trout HACCP plan.