Optical quality changes of the ocular lens during induced parr-to-smolt metamorphosis in Rainbow Trout (<Emphasis Type="Italic">Oncorhynchus mykiss</Emphasis>) |
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Authors: | Email author" target="_blank">Kevin?L?H?van DoornEmail author J?G?Sivak M?M?Vijayan |
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Institution: | (1) School of Optometry, University of Waterloo, 200 University Avenue W., Waterloo, ON, N2L 3G1, Canada;(2) Department of Biology, University of Waterloo, 200 University Avenue W., Waterloo, ON, N2L 3G1, Canada;(3) Present address: 2220 County Rd 10 (RR 1), St-Eugene, ON, K0B 1P0, Canada |
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Abstract: | The effect of an induced salmonid parr-to-smolt metamorphosis (smoltification) on the optical quality of the ocular lens was studied. In two separate experiments, rainbow trout (Oncorhynchus mykiss) parr were fed thyroxine in their diet to induce the metamorphosis. Lenses were excised at regular samplings during the treatment period and optically scanned using a custom scanning laser monitor. Radioimmunoassay was used to measure serum titers of thyroxine and 3,5,3-triiodo-L-thyronine. It was found that lens optical quality was consistently negatively correlated with 3,5,3-triiodo-L-thyronine levels, but not with thyroxine levels. To test if thyroid hormones are directly responsible for the change in optical quality, rainbow trout lenses were cultured for 72 h in a medium containing 3,5,3-triiodo-L-thyronine, but no effect was observed. The significance of these findings in the contexts of the fishes visual capabilities and smolting physiology is discussed. |
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Keywords: | Thyroxine Thyroid hormone Rainbow trout Ocular lens Metamorphosis |
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