文獻來源: Ferraz E, Sommerville C. 1998. Pathology of Piscinoodinium spp. (Protozoa: Dinoflagellida), parasites of the ornamental freshwater catfishes Corydoras spp. and Brochis splendens (Pisces: Callichthyidae). Diseases of Aquatic Organisms 33: 43-49. [全文下載]
Abstract
Piscinoodinium (Protozoa, Dinoflagellida) was commonly found on routine smears of samples of Brochis splendens and Corydoras spp imported into Britain from South America, and on samples of the same gioup of ilsh examined at the evporters holding facilities in Brazil Infected fish had trophonts of difielent sizes on the gills and skin In histological sections of the skin, the trophonts were found to be attached within depiessions of diffelent depths or enclosed by hyperplastic epithelial cells Such enclosed trophonts have not previously been reported Since some of the enclosed trophonts were dead, it was lhought that enclosure was a result of the deep penetration of the trophont and the host defence mechamsm. On the gills the Piscinoodinium infection was colnmonly associated with epithclial hypertrophy, focal and diffuse hyperplasia, oedema of the respiratory epitheliuma nd lamellar fusion The presence of this protozoan on different specles of fish from the same shipment suggests that the infection was acquired befoie export The souice of infection and the stages of the export process which expose the fish to the highest nsk of infection are discussed.
Abstract
Piscinoodinium (Protozoa, Dinoflagellida) was commonly found on routine smears of samples of Brochis splendens and Corydoras spp imported into Britain from South America, and on samples of the same gioup of ilsh examined at the evporters holding facilities in Brazil Infected fish had trophonts of difielent sizes on the gills and skin In histological sections of the skin, the trophonts were found to be attached within depiessions of diffelent depths or enclosed by hyperplastic epithelial cells Such enclosed trophonts have not previously been reported Since some of the enclosed trophonts were dead, it was lhought that enclosure was a result of the deep penetration of the trophont and the host defence mechamsm. On the gills the Piscinoodinium infection was colnmonly associated with epithclial hypertrophy, focal and diffuse hyperplasia, oedema of the respiratory epitheliuma nd lamellar fusion The presence of this protozoan on different specles of fish from the same shipment suggests that the infection was acquired befoie export The souice of infection and the stages of the export process which expose the fish to the highest nsk of infection are discussed.
