Some histological observations on the opaque eyes of milkfish Chanos chanos Forskal

Abstract

In a study on energy-protein requirements of milkfish fingerlings using semi-purified diets, several gross observations were made on individual milk-fish such as fin and tail rot, yellowish coloration of the abdomen, opacity and swollen adipose membrane of the eyes. The latter abnormality occurred four to five weeks after feeding semi-purified diets. Milkfish eyes with the abnormality were processed for histological analysis. Opacity of the cornea and lens and degeneration of the eye tissues, thickening of the corneal epthelium and oedema of the stromal layers were seen. Necrosis of the iris, slight thickening of the lens capsule, detachment and destruction of the retinal layers were also observed.