Studies On Monogeneans Of Wild And Cultured Fishes In Xiamen Sea Area

This dissertation includes two contents of studies which were carried on from Junuary of 2005 to Novemer of 2006. On one side, the monogenean species, distribution and infection status in wild fishes in Xiamen sea area of Taiwan Strait were investigated. On the other side, the species and infection intensity of monogenean, which existed in cultured Pagrosomus major and Fugu bimaculatus in Zhangzhou Pozao, were also investigated and statistical analyed .The results were showed as followings:Firstly, from Junuary of 2005 to November of 2006, 15 species of monogeneans, belonging to 5 families 12 genera, were detected in 33 species of wild fishes in Xiamen sea area of Taiwan Strait. There were 9 species of fishes infected by monogeneans, and the infection ratio was 27.3%. At the same time, 5 species of fishes were infected by 2 or more than 2 species of monogeneans .Secondly, from the Aug of 2006 to Nov of 2006, 2 species of monogeneans were found in cultured Pagrosomus major and Fugu bimaculatus. 80% of Pagrosomus major were infected by one kind of monogenean, 100% of Fugu bimaculatus cultured in non-concrete cage were infected by another kind.The results showed, the distribution of monogeneans was related with the species, the density and the circumstance of the host. In the fishes easy to be infected by monogeneans, usually 2 or more than 2 species of monogeneans were found. And what's more, the greater the density of host, the heavier the infection intensity. The monogeneans infection status in cultured was significantly different because of the material of the cage. In non-concrete cage, the infection ratio was 100%, although only one species of monogeneans was found. It obviously showed that concrete cage were not suitable for monogenean living. This maybe give direction to breed Fugu bimaculatus and other species of fishes, it can also provided one effective way to prevent the disease which caused by monogenean.