Diseases encountered in rainbow trout cultured in recirculating systems

摘要: Abstract Recirculating systems create unique environments for fish culture which may provide favorable conditions disease occurrence or the reproduction of opportunistic microorganisms. Stressful in recirculating systems, such as poor water quality high stocking densities tanks, contribute to outbreaks. Non-infectious problems, including levels ammonia, nitrites, carbon dioxide, suspended solids, ozone residual have also caused mortalities systems. The diseases encountered rainbow trout ( O. mykiss ) cultured include: those by bacteria (bacterial gill disease, furunculosis, bacterial kidney fin rot), parasites Gyrodactylus, Chilodonella, Trichodina, Epistylis, Trichophrya, Ichthyopthirius, Ichtyobodo , proliferative amoebic infestation, Coleps ), fungi Saprolegnia and viruses (infectious pancreatic necrosis, viral hemorrhagic septicemia, infectious hematopoietic necrosis). Treatments with chemotherapeutants feed a system present special considerations; main one is whether biofilter will be treated how chemicals could affect its function. Management practices designed prevent degradation are critical successful facility. introduction known pathogens infected should prevented either hatching eggs at facility from disease-free broodstock, purchasing fingerlings certified broodstock creating quarantine period. Each design protocol prevention control aid health professional, based on generally accepted principles management.