Studies on the Caligusiasis and Benedeniasis of marine cage cultured fish in Pingtung area of Taiwan
2000
Chang, P.S. | Wang, Y.C. (National Kaohsiung Inst. of Marine Technology, Kaohsiung 811 (Taiwan). Dept. of Aquaculture)
The present study attempted to investigate and study the parasitic diseases (caligusiasis and benedeniasis) occuring in marine cage-cultured fish in Pingtung area of Taiwan. The major cage-cultured fish species included grouper (Epinephelus spp.), red sea bream (Pagrus major), cobia (Rachycentron cnadum), and greater yellow tail (Seriola dumerili). There were differences in the prevalence of these two parasitic diseases in different seasons and fish species. For the Caligusiasis, it was always found in grouper and seldom found in the other three species. The cases of Caligusiasis were observed throughout the year especially in summer. The diseased fish became darker, secreted more mucous and showed hemorrhages on the body surface. Then these lesions would result in inflammation and ulcer by secondary bacterial infection. The cases of benedeniasis were major in great yellow tail and then in grouper. The infection occured in the whole Pingtung area including Shauliuchyou starting March. The cases gradually decreased in July of the same year. The affected fish secreted more mucous in the skin and scoured the cage that resulted in hemorrhage on the body surface, the scales falling, secondary bacterial infection and inflammation. Heavily infected fish turned anemic and weak and finally died
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