Valentina P. Gnyubkina

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The morphology, fine structure and spectral sensitivity of retinal photoreceptors of two anchovy species were investigated using light and electron microscopy and microspectrophotometry. Distinct regional specialisation of cones was observed. Long and short (bilobed) cones were observed in the horizontal retinal belt, including the nasal and temporal(More)
The embryonic and early larval development of the Cherskii’s sculpin Cottus czerskii Berg, 1913 was studied. The duration of the embryonic period was 21 days at a water temperature of 9–10°C. Pelagic larvae of approximately 8.0 mm total length leave the egg envelopes, with a large rounded yolk sac with one large oil globule, 10–12 trunk and 30–31 precaudal(More)
The retina of anchovies is characterized by an unusual arrangement and ultrastructure of cones. In the retina of Japanese anchovies, Engraulis japonicus, three types of cones are distributed into rows. The nasal, central, temporal, and ventro-temporal regions of the retina were occupied exclusively by the long and short cones. Triple cones, made up of two(More)
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(More)
The studies reported here provide the first demonstration that retinal responses in both the fry of the migratory salmon trout Oncorhynchus masou and the dwarf form of this species changed in conditions of experimental neutralization of the geomagnetic field (GMF); migratory salmon trout fry and dwarves showed different changes. The responses of different(More)
Pacific Ocean salmon (Oncorhynchus masou) fry aged six months mounted specific, previously undescribed, responses to exposure of retinal photoreceptors to ultraviolet light (UVL) in different combinations with a constant magnetic field (MF) (80 G). After exposure to UVL for 2 h (experiment 1), the pigment index (PI) of the retinomotor response increased(More)
This study revealed additional data concerning the spawning period of the Japanese anchovy Engraulis japonicus Temminck et Schlegel, 1846 in Vostok Bay (Peter the Great Bay, Sea of Japan). The spawning of E. japonicus in this area ends in September at a water temperature of 17.5 ± 3°C. Some important peculiarities of the embryonic and postembryonic(More)
The retinomotor response was studied in fry of the salmon trout Oncorhynchus masou during experimental exposures to a constant magnetic field and red light alone and together. The responses of photoreceptors and the pigmented epithelium to red light were mesopic in nature. The mesopic state of the retina after exposure of fish to a magnetic field in the(More)
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