Application of age data to the Oregon data-moderate assessments for Copper and Quillback rockfishes, Science Bulletin 2022-07

Identification Information

Citation

Originator: Whitman, A.D. and C. Wetzel

Publish Date: November 2022

Online Link: None

BPA Project #:

Contact Information

Agency: Oregon Department of Fish and Wildlife

Name: Alison Whitman

Job Position: Marine Fisheries Analyst

Telephone: 541-961-4499

E-Mail Address: alison.d.whitman@odfw.oregon.gov

Description

Abstract: In 2021, the Pacific Fisheries Management Council conducted stock assessments for Copper (Sebastes caurinus) and Quillback rockfishes (S. maliger) off Oregon using a length-based data-moderate assessment approach. This approach excludes direct incorporation of age data for these two assessments. This project re-runs these assessment models, but incorporates the available age data for each species, to evaluate the ability to estimate key aspects of their population dynamics, including growth and recruitment. Two model configurations were explored for each species, one with and one without estimation of annual recruitment deviations. These modeling attempts were largely unsuccessful, but for different reasons. For Quillback Rockfish, the limited age data (n = 951) appeared to be insufficient in quantity to estimate growth and recruitment deviations simultaneously, which will be addressed for future assessments by ageing the existing collection of age samples. For Copper Rockfish, a relatively substantial age dataset was available (n = 2,631), but still did not provide enough information to estimate growth and recruitment deviations within the model simultaneously. The Copper Rockfish models explored appeared to be particularly sensitive to the treatment of the commercial data, consistent with the 2021 adopted data-moderate assessment.

Purpose:

Time Period of Content:

Geographic Extent: Oregon Coast

Status: Final

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Format: pdf

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Is a physical copy maintained for reference at Headquarters? Unknown