Author : Darcy K. McCarrick
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (13 download)
Book Synopsis Effects of Air Exposure on Survival of Yellowstone Cutthroat Trout Angled from a Stream with Warm Water Temperatures by : Darcy K. McCarrick
Download or read book Effects of Air Exposure on Survival of Yellowstone Cutthroat Trout Angled from a Stream with Warm Water Temperatures written by Darcy K. McCarrick and published by . This book was released on 2019 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: We evaluated the effects of air exposure on Yellowstone Cutthroat Trout Oncorhynchus clarkii bouvieri caught and released in a coldwater stream with elevated water temperatures (i.e., > 14°C) in southeastern Idaho. Fish were caught by angling in a 2.3 km section of Fall Creek, Idaho, during August 2018. Sampled fish remained underwater while they were measured and then tagged with T-bar anchor tags. Fish were exposed to air for 0, 30, or 60 seconds and then released at the point of capture. Temperature was continuously monitored during the study period. Water temperatures during the study varied from 10.0°C to 19.7°C and averaged 14.9°C (SE = 0.08). In total, 161 Yellowstone Cutthroat Trout were caught via angling over 10 days. Of those fish, 54 were not exposed to air, 54 were exposed to air for 30 s, and 53 were exposed to air for 60 s. Electrofishing was used to recapture tagged fish and estimate relative survival. Relative survival was highest for fish exposed to air for 60 s (proportion ± SE; 0.40 ± 0.25) followed by 0 s (0.35 ± 0.25) and 30 s (0.30 ± 0.27), but differences were not statistically significant. Results from this study are consistent with other air exposure studies suggesting that air exposure of 60 s or less is not likely a concern in Yellowstone Cutthroat Trout fisheries. Releasing fish as quickly as possible is always encouraged, but management regulations exposure. Nevertheless, similar studies on other systems and species are warranted.