Chapter: Health Management in Aquaculture: Parasitic diseases and pests

Nematode Infestations - Fish Diseases Caused by Parasites

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

Nematode Infestations

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

CAUSATIVE AGENT:

Spirocamallanus, Raphidascaris, Contracaecum, Echinocephalus

SPECIES AFFECTED:

Siganid, grouper, catfish, snakehead, goby

GROSS SIGNS:

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.

DIAGNOSIS:

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

• Filtration

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Health Management in Aquaculture: Parasitic diseases and pests : Nematode Infestations - Fish Diseases Caused by Parasites |