Retinal projections in sockeye salmon smolts (Oncorhynchus nerka) |
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| Authors: | Prof. Sven O. E. Ebbesson Gary T. Bazer James B. Reynolds Raymond P. Bailey |
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| Affiliation: | (1) Medical Sciences (WAMI) and the Institute of Marine Sciences, University of Alaska, Fairbanks, Alaska, USA;(2) Department of Anatomy, Louisiana State University School of Medicine, Shreveport, Louisiana, USA;(3) Cooperative Fisheries Research Unit, University of Alaska, Fairbanks, Alaska, USA;(4) Medical Sciences (WAMI), University of Alaska, Fairbanks, Alaska, USA;(5) UAF, Box 1080, 99775 Fairbanks, Alaska, USA |
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| Abstract: | Summary The retinal projections in 2-year-old salmon smolt (Oncorhynchus nerka) are significantly different from those observed in other teleosts examined to date in that the projections are more extensive. Very noticeable are extensive projections to most of the dorsal thalamus, to all layers of the optic tectum, and into the periaqueductal gray of the torus semicircularis. The salmon smolt has bilateral retinal projections to the diencephalon and pretectum. A small retinal projection to the lateral habenular nucleus has not been described previously. Although these findings suggest striking differences in retinal projections among teleosts, this variation may relate to age differences since the previously studied teleosts were adults. |
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| Keywords: | Visual system Cobalt-lysine method Smoltification Salmon, Oncorhynchus nerka (Teleostei) |
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