Change search
ReferencesLink to record
Permanent link

Direct link
The Effect of Catch and Release Angling at High Water Temperatures on Behavior and Survival of Atlantic Salmon (Salmo salar L.)
Norwegian University of Science and Technology, Faculty of Natural Sciences and Technology, Department of Biology.
2013 (English)MasteroppgaveStudent thesis
Abstract [en]

Many wild Atlantic salmon (Salmo salar L.) populations have declined during the last decades. A multitude of restrictions on riverine fisheries have been initiated to preserve spawning populations, including increased use of catch-and-release (C&R) angling. As a result, more than half of all Atlantic salmon caught in the north Atlantic region during the recent years have been released. Previous studies have shown that the majority of the caught and released Atlantic salmon angled at temperatures below 15 °C survived and participated in spawning, while the mortality seemed to increase at higher water temperatures. However, the survival of caught and released salmon at water temperatures above 15 °C has so far not been well examined under natural conditions. In this study, I investigated behavior and survival following C&R for wild Atlantic salmon (n = 52) angled on regular sport fishing gear in the River Otra in southern Norway at water temperatures ranging between 16.3-19.7 °C (mean 17.3 °C). The fish were tagged externally with radio transmitters without being anaesthetized and immediately released back into the river to simulate a realistic C&R situation. The results showed that a large proportion survived C&R (92%, n = 48) and that all salmon present in the River Otra during the spawning period 3-4 months later were located at known spawning grounds. Downstream movements during the first four days after release were recorded for 74% of the fish, and this was regarded as unusual behavior caused by C&R. Unusual behavior in the form of downstream movements during the first four days after release were recorded for 74% of the fish, and were assumed to have been caused by C&R. The salmon spent on average 24 days before commencing their first upstream movement after release and 41 days before they returned to or were located above their release site. The results suggest that C&R at these water temperatures may be a viable management tool as most fish survived and were present on the spawning grounds. However, it is not known if the physiological strain inflicted by C&R and the altered behavior affected reproductive success for caught and released fish compared to non-angled fish.

Place, publisher, year, edition, pages
Institutt for biologi , 2013. , 50 p.
URN: urn:nbn:no:ntnu:diva-23960Local ID: ntnudaim:8697OAI: diva2:692803
Available from: 2014-02-01 Created: 2014-02-01 Last updated: 2014-02-01Bibliographically approved

Open Access in DiVA

fulltext(3862 kB)646 downloads
File information
File name FULLTEXT01.pdfFile size 3862 kBChecksum SHA-512
Type fulltextMimetype application/pdf
cover(2098 kB)9 downloads
File information
File name COVER01.pdfFile size 2098 kBChecksum SHA-512
Type coverMimetype application/pdf

By organisation
Department of Biology

Search outside of DiVA

GoogleGoogle Scholar
Total: 646 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 61 hits
ReferencesLink to record
Permanent link

Direct link