Chapter: Health Management in Aquaculture: Parasitic diseases and pests

Sporozoans - Crustacean Diseases Caused By Parasites

Sporozoans produce simple resistant spores with a special apical complex used in the invasion of the host cell. They can occur in the intestinal organs, muscle tissue and skin of fish.

Sporozoans

Sporozoans produce simple resistant spores with a special apical complex used in the invasion of the host cell. They can occur in the intestinal organs, muscle tissue and skin of fish.

CAUSATIVE AGENT:

Gregarines (3.5-4 x 8-16 µm) (Fig. 5-19)

SPECIES AFFECTED:

Penaeid shrimps

Gross signs:

Gregarines may be detected in the digestive tract microscopically.

EFFECTS ON HOST:

Large numbers of the parasite attached to filter apparatus of shrimp may possibly interfere with filtration of particles moving towards hepatopan-creatic ducts or passing through the stomach. There is a considerable growth retardation. Infection rate in pond-grown shrimps was reported to reach 94%.

DIAGNOSIS:

Microscopic or histological examination of the digestive tract of the host.

PREVENTION AND CONTROL:

• In the hatchery, filter or chlorinate seawater used for rearing

• In grow-out ponds, eliminate the molluscan intermediate host

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Health Management in Aquaculture: Parasitic diseases and pests : Sporozoans - Crustacean Diseases Caused By Parasites |