I propose a mechanism that controls the
stock-recruitment relationship (SRR), which should replace traditional SRR
models. The difference between the traditional SRR models and the model
proposed herein is whether or not a density-dependent effect is assumed. The
new mechanism elucidates the following: 1) why clockwise loops or anticlockwise
loops are commonly observed in an actual SRR, and 2) the age at maturity (not a
density-dependent effect) determines the slope of the regression line for the
SRR. These cannot be explained by the traditional SRR models, the basis of
which is a density-dependent effect. The new SRR mechanism can well explain the
SRRs for Pacific stocks of Japanese sardine, Pacific bluefin tuna and Arctic
bluefin tuna. The new SRR mechanism proposed herein should be used as a valid
SRR model when the management of fishery resources is discussed. Without the adaptation
of this new mechanism, fishery resource management may continue to be troubled
by the lack of validity of the traditional SRR models.
Cite this paper
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