Catfish Fabrication

Plate 1. Viral infections: a,b. Transmission electron microscopic (TEM) view of Herpes-like infection in gold fish, naked (80–100 nm in size) and coated viral particles (106–153 nm) formed in the nucleus (N) and spread into the cytoplasm (Cy). c,d. Viral particles (size about 100 nm) recovered from tilapia fry affected by whirling disease (by TEM). e. Hypertrophic virus infected endothelial cell in the lamina propria of gourami (Trichogaster trichopterus) gut (Histology by light microscopy [LM]). f–h. TEM view of virus infected endothelial cell from the gourami; the corona-like particles are 111–141 nm in size. A. host-cell peripheral cytoplasmic layer; C, debris filled interior space of the cell; V, virus forming layer.

Plate 2. Lymphocystis and other iridovirus-like infections: a. Tilapia amphimelas (50 mm long) from L. Kitangiri, Kenya, infected with lymphocystis (arrow). b. Tail of Haplochromis sp. from L. Victoria (Entebbe), with cluster of lymphocystis cells. c,d. Histological sections of a cluster of hypertrophic lymphocystis cells from L. Victoria Haplochromis sp. (cells’ diam. 0.25–0.3 mm). e. Histological section (in LM) of an hypertrophic lymphocystic cell (size 0.13–0.16 mm) from gourami, virus particles are visible as fine dots. f–h. Lymphocystis virus particles (166–216 nm wide) from gourami, in active (g,h) and aged (f) cells. i,j. Iridovirus-like particles (size 141–193 nm) from viscera of gourami.