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The ontogeny of ultraviolet photosensitivity in rainbow trout (Salmo gairdneri)

  • Craig W. Hawryshyn (a1), Margaret G. Arnold (a1), Duane J. Chaisson (a1) and Patricia C. Martin (a1)


The present study examines the changes in ultraviolet (UV) photosensitivity that occur during the growth of rainbow trout (Salmo gairdneri). A comparison of the ocular media transmission of small (n = 3) and large (n = 3) trout eyes did not reveal large changes in the transmission of UV radiation through the eye. We used the heart-rate conditioning technique to measure spectral sensitivity in immobilized trout. Four trout, each weighing less than 30 g, exhibited a UV-sensitivity peak at 360 nm while four additional trout weighing more than 60 g each exhibited no evidence of UV sensitivity. Spectral-sensitivity measurements of two trout weighing 44 g and 60 g revealed UV sensitivity, but when measured one month later (after a 25% increase in body weight) both fish exhibited no UV-sensitivity peak. At this time their sensitivity appeared to conform to the known blue-sensitive cone mechanism.



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The ontogeny of ultraviolet photosensitivity in rainbow trout (Salmo gairdneri)

  • Craig W. Hawryshyn (a1), Margaret G. Arnold (a1), Duane J. Chaisson (a1) and Patricia C. Martin (a1)


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