Research Document - 2011/133
Updated Methods For Assessing Harvest Rules For Fraser River Sockeye Salmon (Oncorhynchus nerka)
By Gottfried Pestal, Ann-Marie Huang, Alan Cass and the FRSSI Working Group
Abstract
The Fraser River Sockeye Spawning Initiative (FRSSI) has been an on-going process to develop guidelines for setting annual spawning and exploitation targets for Fraser River sockeye salmon stocks. The initiative began in early 2002, and has since evolved through a series of workshops and on-going feedback from stakeholders. A quantitative modeling tool has been used to support the planning process, and was reviewed by PSARC in 2003. The model has evolved substantially since then, and was reviewed again by CSAS in 2010. Changes include assumptions about spawner-recruit relationships (e.g. delayed density dependence effects), the range of strategies that can be explored (e.g. allowable mortality rules), mixed-stock simulations (i.e. 19 stocks in 4 management groups), and additional biological mechanisms (e.g. environmental management adjustments, pre-spawn mortality, future patterns in productivity). This Research Document provides an update on model expansions and revisions, and presents simulation results to illustrate the range of questions that can be explored with the model.
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