Studies on the Main Parasitic Diseases Affecting Cultured Fish And Its Influences By Some Ecological Factors

A total of2292 cultured fish (Tilapia spp., Mullet spp., common carp andClarias lazera) were used for studies during the period from March, 1995 toDecember, 1996. As well as 63 water samples were collected from the same fishfarms during the previous period were obtained to study the incidence of themain parasitic diseases affecting cultured fish. Their relation to differentlocalities, types of fish, fish life stages, seasons and water quality weredetermined. Also experimental studies on the effect of water salinity and totalhardness on rate of parasitic infestation were: applied. Beside trials for treatmentof Dactylogyrus infestation using commercial acetic acid 6% and potassiumpermanganate were carried out.J- Survey on the main parasitic diseases affecting cultured fish:In this study 1500 cultured fish were represented three main fish cultureareas:(A) Abbasah area which supplied by Ismailia canal (fresh water) whichrepresented by Abbasah fish hatchery and fish farm. A total number of 1286fish were examined which were represented three types of cultured fishes asthe following:1- Tilapia spp: 709 fish (319 fry, 228 fingerlings and 162 adults) were examinedthrough different seasons.2- Common carp: 509 fish (329 fry, 117 fingerlings and 63 adults) wereexamined through different seasons.3- Clarias lazera: 68 adult fish were examined through different seasons.