Abstract

Groupers ( Epinephelus malabaricus Bloch et Schneider) obtained from a fish market (i.e., wild population) and those cultured in floating cages were examined for parasites. Sixteen and 11 species of parasites were recovered from cultured and wild groupers, respectively. All fish examined were infested with one or more species of parasite. The overall mean intensity of infestation was about three times higher in cultured (449) than in wild (197) groupers. The diplectanid monogenean, Pseudorhabdosynochus epinepheli Yamaguti 1938, was the most abundant parasite recovered, with a high mean intensity of 335 in the cultured and 127 in the wild fish; 97.2% and 77.1% of the cultured and wild groupers, respectively, were infested by the trematode Prosorhynchus pacificus Manter 1940, with a mean intensity of 81 (cultured) and 72 (wild). Ergasilus borneoensis Yamaguti 1954 was found only in 19% of the cultured groupers, with a mean intensity of 177. Cultured groupers have a greater variety of parasites and higher intensities of infestation than wild groupers. The high numbers of parasites in cultured groupers may be an important factor leading to the frequently observed outbreaks of disease in floating cages.

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