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Chapter: Health Management in Aquaculture: Parasitic diseases and pests

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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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