ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on June 27, 2007
ICES Journal of Marine Science: Journal du Conseil 2007 64(8):1535-1542; doi:10.1093/icesjms/fsm087
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Simulated fishing experiments for predicting delayed mortality rates using reflex impairment in restrained fish
NOAA/NMFS/Alaska Fisheries Science Center, Hatfield Marine Science Center, 2030 SE Marine Science Drive, Newport, OR 97365, USA
Tel: +1 541 867 0256; fax: +1 541 867 0136; e-mail: michael.w.davis{at}noaa.gov
Davis, M. W. 2007. Simulated fishing experiments for predicting delayed mortality rates using reflex impairment in restrained fish. – ICES Journal of Marine Science, 64: 1535–1542.Development of efficient methods to predict discard and escapee mortality in fishing operations is essential to the conservation of sensitive fish stocks. For a few fisheries, mortality data are available from fishing experiments in the field; these require long-term holding or monitoring of fish in tanks, cages, or tag and recapture experiments to detect delayed mortality. A different approach to predicting discard and escapee mortality is to use reflex action mortality predictors (RAMP) consisting of relationships between mortality and reflex impairment for species of interest. Fish were towed in a net in the laboratory and then either restrained in foam-lined holders and rapidly tested for reflex impairment five minutes after towing, or held for up to 60 days to determine delayed mortality. Delayed mortality occurred up to 20 days after towing. RAMP was related to mortality with biphasic sigmoid functions. As fishing stressors increased in intensity, the first phase showed an increase in RAMP with no concomitant mortality. In the second phase, RAMP continued to increase, while mortality became apparent and increased. The measurement of RAMP in restrained fish on board fishing vessels during experiments to predict discard mortality and in caged free swimming fish to predict escapee mortality is feasible and advisable.
Keywords: delayed mortality, fish condition, reflex impairment, salmon, stress, survival
Received 8 August 2006; accepted 14 April 2007; advance access publication 27 June 2007.
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