Lymphocystis Disease - Viral Infections In Fish

Lymphocystis Disease

CAUSATIVE AGENT:

Iridovirus (130-330 nm)

SPECIES AFFECTED:

Lates sp. and Siganus sp.

GROSS SIGNS:

Infected fish have clusters of pear-like nodules up to 5 mm in diameter that develop on the skin, gills or fins resulting from an enlargement of tissue cells.

EFFECT ON HOST:

The disease is rarely fatal in older fish. It can be transmitted by cohabitation and exposure to contaminated water.

DIAGNOSIS:

Signs of the disease, histopathology and EM