Common and Emerging Diseases in Commercially-Cultured Summer Flounder, Paralichthys dentatus

摘要

Infectious diseases are one of the most common causes of losses in commercial aquaculture for all life stages of fish production. Parasitic infestations such as Trichodina sp., Cryptocaiyon sp., Amy-loodinium sp., Trypanoplasma sp., and monogenic trematodes may have detrimental health consequences when present in high numbers within a cultured population. Bacterial agents such as Vibrio sp., Edwardsiella sp., Flexibacter sp., and Mycobacterium sp. may he dormant in some populations but then result inhigh morbidity or mortality when the fish become stressed by environmental or nutritional factors. Viral diseases are more difficult to diagnose but there are reports of lymphocystis and other viral diseases occurring in flounder species. Many of thesediseases result in similar clinical signs of disease. For accurate disease diagnosis, appropriate methods must be implemented to identify and prevent the introduction or dissemination of disease in an aquaculture facility.