Management Strategy Evaluation of Fisheries Resources in Data-poor Situations Using an Operating Model Based on a Production Model

Japan Agricultural Research Quarterly
ISSN 00213551
NII recode ID (NCID) AA0068709X
Full text
48-02-15.pdf224.72 KB

The allowable biological catch (ABC) in Japanese fishery management is currently determined by applying harvest control rules, which are categorized into two types depending on whether or not stock-size information is available. We evaluate management procedures (MPs) in data-poor situations using an operating model (OM) based on a production model. The OM incorporates uncertainties regarding its assumptions and the process and observation errors of population dynamics and fishing processes, while the values of the MP parameters are determined to avoid stock collapses and low catches. We evaluated the MP formulation ABC = δ×Ct ×(1+k(b/I)), where δ is a coefficient dependent on the stock status level on the stock size, Ct is the catch in year t, k is the weight coefficient, b reflects the trend in stock abundance index over time, and I is the mean of the stock abundance index I. This study shows that smaller values of k reduce the frequency of substantially low catches, particularly when there is significant uncertainty surrounding the stock status. In addition, the value of δ affects both the frequency of fishery collapse as well as stock and catch sizes. We conclude that more reliable stock abundance indices are necessary if the stock size and catch are to stabilize and MPs become more robust to uncertainties.

Date of issued
Creator OHSHIMO Seiji NAYA Miyako
Subject

harvest control rules

management procedure

population dynamics

Publisher Japan International Research Center for Agricultural Sciences
Available Online
NII resource type vocabulary Journal Article
Volume 48
Issue 2
spage 237
epage 244
DOI 10.6090/jarq.48.237
Rights Japan International Research Center for Agricultural Sciences
Language eng

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