Retinal responses of pink salmon associated with its downstream migration

ABSTRACT THE seaward migration of juvenile Pacific salmon is usually nocturnal and confined to a relatively brief portion of the night1. It has been suggested that “as the light intensity

falls rheotactic responses, which are to a large degree dependent on vision, fail, and these fish pass down stream in shoals. The fact that such mass movements occur during a rather precise

period of the night is probably due to the dark adaptation of the eye and a period of night blindness”2. In support of this view, a recent histophysiological examination of the retinæ from

several species of _Oncorhynchus_ has shown an incompletely dark-adapted condition of the retinæ at the time of most active downstream migration3,4. As a further test of this hypothesis, the

retinæ from fish killed at different light intensities during the evening and early morning have been compared with the retinæ from fish which were completely adapted to the same light

intensities in the laboratory. The pink salmon fry (_Oncorhynchus gorbuscha_), probably the most specialized of the downstream migrant salmon1, was selected for the study. Access through

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BEING VIEWED BY OTHERS BIOLUMINESCENCE AND ENVIRONMENTAL LIGHT DRIVE THE VISUAL EVOLUTION OF DEEP-SEA SHRIMP (OPLOPHOROIDEA) Article Open access 11 February 2025 DOMESTICATION OF

CAPTIVE-BRED MASU SALMON _ONCORHYNCHUS MASOU MASOU_ (SALMONIDAE) LEADS TO A SIGNIFICANT DECREASE IN NUMBERS OF LATERAL LINE ORGANS Article Open access 06 October 2022 THE NON-VISUAL OPSINS

EXPRESSED IN DEEP BRAIN NEURONS PROJECTING TO THE RETINA IN LAMPREYS Article Open access 15 June 2020 REFERENCES * Hoar, W. S., _J. Fish. Res. Bd. Canada_, 15, 391 (1958). Article  Google

Scholar  * Hoar, W. S., _Biol. Rev._, 28, 437 (1953). Article  CAS  Google Scholar  * Brett, J. R., and Ali, M. A., _J. Fish. Res. Bd. Canada_, 15, 815 (1958). Article  Google Scholar  *

Ali, M. A., Ph.D. thesis, Univ. British Columbia (1958). * Neave, F., _J. Fish. Res. Bd. Canada_, 12, 369 (1955). Article  Google Scholar  Download references AUTHOR INFORMATION AUTHORS AND

AFFILIATIONS * Department of Zoology, University of British Columbia, Vancouver M. A. ALI & W. S. HOAR Authors * M. A. ALI View author publications You can also search for this author

inPubMed Google Scholar * W. S. HOAR View author publications You can also search for this author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE

CITE THIS ARTICLE ALI, M., HOAR, W. Retinal Responses of Pink Salmon associated with its Downstream Migration. _Nature_ 184, 106–107 (1959). https://doi.org/10.1038/184106a0 Download

citation * Issue Date: 11 July 1959 * DOI: https://doi.org/10.1038/184106a0 SHARE THIS ARTICLE Anyone you share the following link with will be able to read this content: Get shareable link

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