Microsporidia are obligate intracellular parasited eukaryotes.The range of hosts included invertebrate and vertebrate.The microsporidian species parasited mainly fishes and insects.
Its compositional ichthyofauna differs from its consecuting fiver systems,and has momentous significance on succession of fishes and ichthyofauna dividatur in watershed of North China.
An investigation of Anisakis simplex larvae,the most important causative agent of anisakiasis,in marine fishes caught in Bohai sea was carried out in order to detect their infectivity.
Fish especially rich in thiaminase are herring, capelin, suckers, smelts and various carp species, a total of some 50 species, most of which live in fresh water.
Digenetic trematodes infection on fish was analyzed in the Bohai Sea horn 1983 to 1986.The results showed that the infection value in inner sea was higher than outer sea.
The change trend was influenced by several reasons such as the aquatic habitat, the ecological characteristics of fish, the community structure of digenetic trematodes and import of live fish.