Abstract
The study is aimed to examine the current status of parasitic infection on cobia (Rachycentron canadum) cage cultured at 4 islands (Phu Quoc, Tien Hai, Hon Nghe and Nam Du), Kien Giang province. A total of 75 cobia samples, including 49 fingerling and 26 growth-out samples, were collected from 36 cages. Fish specimens were recorded clinical signs and examined parasitic infection. Results showed that six ectoparasites (Amyloodinium ocellatum, Cryptocaryon irritans, Trichodina sp., Neobenedenia sp., Pseudorhabdosynochus sp. and Parapetalus sp.) and three endoparasites (Leptorhynchoides sp., Procamalanus sp. and Anisakis sp.) were found. Leptorhynchoides sp. showed the highest prevalence (95%) and intensity (1-14 worms/fish), while Anisakis sp. was the lowest intensity (2-8.3 worms/fish). Neobenedenia sp. were the most common parasite with high prevalence (62.5%) and intensity (3-160 worms/fish) of all stages of cultured cobia. Remarkably, two species A. ocellatum and C. irritans were recorded the prevalence of 82.6 and 90.3% respectively, were the most important pathogenic parasites causing rapid mortality for fingerling and juvenile cobia in Phu Quoc and Hon Nghe island.
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