SOME STUDIES ON GILL AFFECTIONS OF SOME FRESHWATER FISHES

Abstract

The present study was canied out on 600 freshwater fishes (300

Tilapia species fish and 300 Almout catfish) collected alive from Fish Research Center, Suez Canal University, Ismailia canal and Abbassa Central Laboratory for Aquaculture Research (Sharkia goven1orate) during different seasons of the year. The fishes were subjected to clinical, bacteriological, parasitological, mycological and histopathological examinations.

Clinical examination showed that 33.3% ofTilapias fish and 40 % of AI•mout catfish were clinically diseased. The clinical abnormalities were rabid breathing, aggregation of fishes around the water inlet or at the water surface with gulping air and widely opened gill cover. Also, the fishes were suffered from, sluggislmess, frayed fins, ulceration, detaclunent of scales, with blood spots on different parts of fish body. The gills of some fishes were pale with excessive mucus secretion and cogested in others. In some fishes lomprglena crustacea were showed attached to the gills.

The results of parasitological examination of gills, detected different types of parasites including, Trichodina species, Cichlidogyms species, Gyrodactylus species, lamproglena species from Tilapia fish. While Trichodina species and Quadriacanthus species were isolated from Annout catfish.