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Characteristics on the Crytocaryon irritans of Rock bream, Oplegnathus fasciatus in the embankment fish farm  

Choi, Hye-Sung (Southeast Sea Fisheries Institite, National Fisheries Research & Development Institute)
Bang, Jong-Duk (New Strategy Research Center)
Park, Myoung-Ae (Pathology Division, NFRDI)
Publication Information
Journal of fish pathology / v.23, no.3, 2010 , pp. 281-291 More about this Journal
Abstract
Crytocaryon irritans infection of rock bream was investigated in embankment fish farm from July to December 2009. Prevalence variation was 20.0~88.0% that was high in september and was low in July. While no mortality was found in July and August, it occurred after mid september. Environmental conditions during the survey period were water temperature $19.3{\sim}24.3^{\circ}C$, dissolved oxygen $5.0{\sim}7.1\;mg\;L^{-1}$ and salinity 31.9~33.7 psu, and the water temperature during mortality season was $24.0^{\circ}C$. External symptom of the rock bream was secretion mucus but swimming showed fine in the early infected period. While, the symptoms in the severe outbreak season were excess of mucus, falling off tail and congestion, bleeding spot the surface and weakened swimming. We observed free living and parasitic stages in the gills and body surface of rock bream. Hepato somatic index (HSI) was $1.9{\pm}1.1{\sim}3.5{\pm}1.7%$, which was low in the September being mortality season but was high in November. The percentages of hematocrit infected with Crytocaryon irritans were 37.3% and 41.0% in July and August, respectively while they gradually decreased to 32.1% and 24.2% in september and October, respectively. Total cholesterol and Triglyceride values rapidly decreased by October. After mortality, AST and ALT were 7 and 5 folds higher compared to non-mortality season.
Keywords
Rock bream; Oplegnathus fasciatus; Embankment fish farm; Crytocaryon irritans; Prevalence;
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