Studies On Some Diseases Caused By Crustae_eans Parasites In Some Fishes And Trials For Treatment

Studies On Some Diseases Caused By Crustae_eans VI. In this study we collected 1047 fishes of different sp. fromdifferent localities obtained seasonally for detection of crustaceanparasites, recording clinical signs of infested fishes and performingsome treatment trials in some infested fish. the prevalence ofcrustacean parasites was 27.98% during the current study. Theinfestation rates were 10.31 %, 33.77% and 45.83% in wild, cultureand aquarium fish respectively. Oreochromis niloticus obtained fromZagazig market only infested with Lamproglena at rate of 15%. Whilethose fish obtained from El-Abbassa fish hatchery and EI-Houseniafish farms not infested. Clarias gariepinus was found to be notinfested with crustacean parasites. Cyprinus carpio obtained from El-Abbassa fish hatchery infested with Lemea sp. at rate of 49.69 %. C.idellae and H molitrix obtained from El-Abbassa fish hatchery wereinfested at rate of 80 % and 61.90 % respectively. Cyprinus carpio(Koi) obtained from Zagazig market was infested with lemea sp at rateof 54.54%. While infested with Argulus sp. at rate of 45.45 %. Koiobtained from El-Seida Eisha market was infested with lemea sp atrate of 42.42%. While infested with Argulus sp. at rate of 66.66 %. Mcephalus obtained from El-Housenia fish farms was infested withErgasilus sp. at rate of 45%The peak of gill crustacean parasites in 0. niloticus, wasobserved in winter (13.33%) followed by autumn (11.11%), thenspring season (2.72%) while in summer season the infestation rate waszero percent. The peak of Ergasilus parasites infestation was observedin summer (73.33%) followed by spring (48%) and autumn (32%)ended with winter (15%). The peak of lemea infestation in cultured.