Nematodes are unsegmented roundworms (Fig. 5-9a, b, c); female, 7-21 x 0.18-0.8 mm; male, 3-9 x 0.1-0.5 mm
Spirocamallanus, Raphidascaris, Contracaecum, Echinocephalus
Siganid, grouper, catfish, snakehead, goby
Parasitizes the stomach and intestine of host fish. Affected fish have emaci-ated, discolored body surface and swollen intestine.
EFFECTS ON HOST:
May impair feeding, resulting in emaciation, growth retardation, and mild mortalities.
Gross examination and dissection of the abdominal area reveals swollen intestine filled with liquid and large worms.
PREVENTION AND CONTROL:
• Elimination of intermediate hosts
• Drying of pond bottom
• Disinfection of culture facilities with quicklime to destroy nematode eggs
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