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11-08-2010, 02:52 PM #1
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Mortality of coho salmon caught and released using sport tackle in the Little Susitna
By Doug Vincent-Lang, Marianna Alexandersdottir, Doug McBride
Fisheries Research, Volume 15, Issue 4, January 1993, Pages 339-356, ISSN 0165-7836, DOI: 10.1016/0165-7836(93)90085-L.
Coho salmon (Oncorhynchus kisutch) were caught with sport gear in the estuary of the Little Susitna River, southcentral Alaska. Fish were double marked and released. All coho salmon observed migrating through a weir above the estuary and a portion caught in a sport fishery below the weir were examined for marks. A second group of coho salmon were caught using similar sport gear above the estuary. These fish were handled and marked identically as the fish captured in the estuary, except that they were held in a holding pen at the weir with an equal number of coho salmon dip netted at the weir. Coho salmon which were caught and released in the estuary suffered a significantly higher rate of mortality (69%) than did either the coho salmon caught and held above the estuary (12%) or those which were dip netted and held at the weir (1%). Factors that could influence rates of hook-induced mortality were measured at the time of hooking. Hook location, hook removal, and bleeding significantly affected the measured mortality rate.