CHARACTERISTICS OF THE EYE STRUCTURE IN FISH DANIO RERIO AFTER EXPOSURE IN MICROGRAVITY
The paper presents the Danio rerio eye histology data following 36 days of exposure on the International space station. As it is known, vision is a primary remote sense organ that gives the fish an idea about its location. Histological investigations of space-flown fishes revealed signs of vitreous body reduction, focal changes in the retina inner layers, and folds in the retina. The factor for these structural disorders appears to be a decreased flux of plasma dialysate from the choroid arterial capillaries due to the hydrostatic pressure drop or low aqueous humor secretion by the iris epithelium. These changes disturb phototransduction from the cone and rod photoreceptor cells to the brain optic lobes.