Effects Of Spawning Run Delay On Spawning Migration Of Arctic Grayling. A Thesis For The Degree Of Master Of Science
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1989-09-01
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TRIS Online Accession Number:00490593
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NTL Classification:AGR-IMPACTS-Environment
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Abstract:The effects of delays on the spawning run of Arctic grayling in Fish Creek, a tributary of the Jack River, near Cantwell, Alaska, were examined. Tagged grayling were delayed for 3, 6, or 12 days, and then released; control fish were released within 12 hours of capture. During the delays, a high proportion of females became ripe; most males were ripe before the delays and remained ripe over a longer period than females. Delayed and control fish were monitored by the recapture of tagged fish in upstream traps. Females released in a "running-ripe" condition migrated at higher rates, but failed to reach upstream areas in similar proportions as those of "less ripe" females. Reduction in distances traveled by grayling as a result of longer delays may lead to the use of non-preferred spawning habitats, underuse of spawning areas upstream, and decreases in recruitment. It is recommended that spawning delays for Arctic grayling not exceed 3 days.
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