[Magnetic field induced structural changes of Oncorhynchus masou retina ]

The work describes the retinomotor response of Oncorhynchus masou young kept at illumination ranging from 1 to 10 lux, exposed to a field of a permanent magnet, and under conditions of geomagnetic field compensation. Retinomotor response in young exposed to magnetic field in darkness corresponds to partial light adaptation. During the exposure to a field of a permanent magnet the pigment was found to concentrate in pigmentocyte processes endings, forming the layer, that subdivided cone outer segments and rod outer segments and ellipsoids. Pigment in an aggregated state poorly shielded rod outer segments. In experiments with geomagnetic field compensation in darkness double and central cones were significantly elongated, the pigment is concentrated in initial parts of the processes and in pigmentocyte bodies. Pigment demonstrates the reaction that is similar to darkness adaptation, while the state of photoreceptors corresponds to a partial light adaptation. The changes of a natural magnetic field were accompanied by unusual retinomotor responses, in which the state of photoreceptors and retinal pigment epithelium did not correspond to photopic, mesopic or scotopic adaptation.