The retinomotor reaction of the retina of young dog salmon Oncorhynchus keta on adaptation to light and the field of a permanent magnet.

Studies of Pacific Ocean dog salmon fry of the species Oncorhynchus keta addressed two retinomotor reactions: after transfer of fish from the dark to the light and after placing fish in the field of a permanent magnet (magnetic induction, 80 G) in complete darkness. The reactions of photoreceptors and the pigment epithelium (PE) to the magnetic field were analogous to those of the retinal reaction on adaptation to light. The morphological characteristics of photoreceptors and retinal PE cells lead to the view that the effect of the field of a permanent magnet on the retina of young dog salmon is comparable to that of light.