19 species of Coccidia, belonging to 2 Family and 2 genera, were described in the paper. Among those, 8 are new to science, nominated as follows: Eimeria eminens sp. nov., E. macropoda sp.nov., E. odontobutis sp.nov., E. huizhouensis sp.nov., E. gigantea sp.nov., E. hemibarba sp.nov., E.huanggangensis sp.nov., Goussia carassii sp.nov.. E. kwangtungensis Chen et Hsieh, 1960, a parasite in Ophiocephalus argus, has three stages in its development, which take place in a same host. They are schizogony, gametogony and sporogony. Both the schizogony and gametogony occur above the nucleus in the epithelia cells of pyloric ceca and anterior intestine. Mature schizonts, spheric or elliptic in form, with 8-14 merozoites of banana shape. Eosinphilic granules were not found in the whole development course of macrogamete. Basephilic granules vary before and after the forming of oocyst wall. Mature microgametocyte with many microgametes. Sporogony take place in pyloric ceca and whole intestine. The relation between Ophiocephalus argus and E. kwangt ungensis Chen et Hsieh, 1960 were revealed as follows: the infection rate reaches a maximum when host body get 20-24. 9 cm.; the infection rate and degree of infection all higher in male host than in female. The infection of E. kwangtungensis in different season has a regular pattern: the highest rate is in spring, then in wind, lowr in summer and autumn. While the degree of infection heavier in autumn and wind, then in spring, the lightest in summer. Both the kidney of Misgurnus anguillicaudatus infected by Goussia carassii all show evident histopathological changes.