The interim management procedure approach for assessed stocks: Responsive management advice and lower assessment frequency

Quang C. Huynh; Adrian R. Hordyk; Robyn E. Forrest; Clay E. Porch; Sean C. Anderson; Thomas R. Carruthers

doi:10.1111/faf.12453

journal article Mar 04, 2020

The interim management procedure approach for assessed stocks: Responsive management advice and lower assessment frequency

Quang C. Huynh

Adrian R. Hordyk

Robyn E. Forrest Clay E. Porch Sean C. Anderson

Thomas R. Carruthers

Fish and Fisheries Vol. 21 No. 3 pp. 663-679 · Wiley

View at Publisher Save 10.1111/faf.12453

Abstract

AbstractStock assessments are often used to provide management advice, such as a total allowable catch (TAC), to fishery managers. Many stocks are not assessed annually, and the TAC from the previous assessment is often maintained in years between assessments. We developed two interim management procedures (MPs) that update the estimate of current vulnerable biomass from a surveyed index of abundance to adjust the TAC from a previous assessment. These MPs differ in how they handle uncertainty in observed indices. Using closed‐loop simulation, we evaluated the two interim MPs (with 10‐ and 5‐year assessment intervals) against several “status quo” approaches: (1) an annual assessment, and (2) a stock assessment every 5 or 10 years with (a) fixed TACs or (b) projections between assessments. We evaluated performance across three life‐history types and six operating model scenarios. The interim MPs performed similarly to annual assessments in terms of trends in biomass and yield, regardless of the assessment interval of the interim MPs. The interim MPs often produced more yield than the Fixed TAC MP with 10‐year assessment intervals, for example, in depleted scenarios. The Fixed TAC MP performed more similarly to interim MPs when the assessment interval for the Fixed TAC MP was decreased to five years. The interim MPs can also perform well when circumstances arise that are not accounted for in the Projection MP. Our results show that interim MPs should be considered for infrequently assessed stocks or rebuilding stocks, and highlight potential cost savings of interim MPs over annual assessments.

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Details

Published: Mar 04, 2020
Vol/Issue: 21(3)
Pages: 663-679
License: View

Authors

Q

Quang C. Huynh

Institute for the Oceans and Fisheries The University of British Columbia Vancouver BC Canada

A

Adrian R. Hordyk

Institute for the Oceans and Fisheries The University of British Columbia Vancouver BC Canada

R

Robyn E. Forrest

Fisheries and Oceans Canada Pacific Biological Station Nanaimo BC Canada

C

Clay E. Porch

National Marine Fisheries Service Southeast Fisheries Science Center Miami Florida United States

S

Sean C. Anderson

Fisheries and Oceans Canada Pacific Biological Station Nanaimo BC Canada

T

Thomas R. Carruthers

Institute for the Oceans and Fisheries The University of British Columbia Vancouver BC Canada

Funding

Fisheries and Oceans Canada

Cite This Article

Quang C. Huynh, Adrian R. Hordyk, Robyn E. Forrest, et al. (2020). The interim management procedure approach for assessed stocks: Responsive management advice and lower assessment frequency. Fish and Fisheries, 21(3), 663-679. https://doi.org/10.1111/faf.12453

The interim management procedure approach for assessed stocks: Responsive management advice and lower assessment frequency

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