Guidance to derive and update fishing-related incidental mortality rates for Pacific salmon / David A. Patterson ... [et al].: Fs70-5/2017-011E-PDF

“Stock assessment methods for Pacific salmon (Oncorhynchus spp.) require estimates of total mortality to obtain accurate exploitation rate and stock size estimates. Total mortality includes both natural mortality and fishing-related mortality. The latter is composed of retained catch, plus any incidental mortality associated with fishing activities. Fishing-related incidental mortality (FRIM) includes mortality of fish that encounter fishing gear but are not captured (e.g., escape mortality), that are dead upon or die during capture but are not retained (e.g., on-board mortality), and that die after release (i.e., post-release mortality). However, several issues have been raised with respect to the information currently used to generate estimates of different types of FRIM, including the variability in the time course for monitoring mortality after a fishery encounter, the lack of fishery-specific information, and the need for an efficient process to incorporate new research as it becomes available. This research document is the second of two documents written in response to these knowledge gaps. The first research document reviewed and discussed the available literature pertaining to factors relevant to FRIM, compiled an evidence catalogue of FRIM estimates for anadromous salmonids, and generated key risk factor scoring tables that can be used to assess FRIM across different fisheries. This second research document uses the scientific information from the first to provide guidance and recommendations on a process to derive and/or update current estimates of FRIM rates for use in the assessment and management of Pacific salmon fisheries"--Introd., p. 1.

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