North Pacific Anadromous Fish Commission

Technical Report 15

Table of Contents

Improving Terminal Abundance Estimates of Spring- and Summer-run Age 52 Fraser River Chinook Salmon by Incorporating a Second CPUE Dataset from the Albion Test Fishery

Authors:
Brittany T. Jenewein and Karen Rickards

Abstract Excerpt:
Fraser River Chinook salmon (Oncorhynchus tshawytscha) are currently managed as five stock aggregates that share similar ages and return timing (Fig. 1). An in-season Bayesian model has been used since 2012 to estimate the total abundance of two of these aggregates: spring- and summer-run age 52 Chinook. This model predicts the terminal aggregate abundance to the mouth of the Fraser River using cumulative weekly catch-per-unit-effort (CPUE) from the Albion test fishery and reconstructed annual run size. These predictions are used as an in-season tool to manage Fraser River fisheries in line with the expected abundance of the aggregated spring- and summer-run age 52 Chinook via a “zoned” approach (DFO 2018). The abundance of these aggregates has been declining in recent years, and it is critical to improve the precision of the in-season model for sustainable fishery management.

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DOI:
https://doi.org/10.23849/npafctr15/148.151.

Citation

Jenewein, B.T., and K. Rickards.  2019.  Improving terminal abundance estimates of spring- and summer-run age 52 Fraser River Chinook salmon by incorporating a second CPUE dataset from the Albion test fishery.  N. Pac. Anadr. Fish Comm. Tech. Rep. 15: 148–151.  https://doi.org/10.23849/npafctr15/148.151.