The
aim of this paper is to discuss the validity of 20% B0,
20% Bunfished and BMSY as reference points for managing
fisheries resources. I reanalyzed eight stock-recruitment relationship (SRR)
sets of data that were analyzed by Myers et
al. in 1994, and showed that the theory proposed by Sakuramoto could be
applied to the above SRR data. The results showed that: 1)
clockwise loops or anti-clockwise loops emerged in the plots of SRR, and the
results coincided well with those of 25 stocks that lived around Japan and the
stock of Pacific bluefin tuna; 2)
the slopes of the regression lines (b)
drawn on SRR planes for above 34 stocks had a negative relationship with the
age-at-maturity (m). That is, b = 0.995 - 0.211·m. Therefore, the results of this paper indicate that the SRR is
governed by a mechanism that is quite different from that which has been
traditionally accepted, and in which the main factor is believed to be a
density-dependent effect. The results also indicated that 20% B0,
20% Bunfished and BMSY, which are derived from traditional
SRR models, do not have any scientific basis as reference points for managing
fisheries resources. Empirical reference points seem to be more reasonable
measures as Hilborn and Stokes emphasized in 2010.
Cite this paper
Sakuramoto, K. (2017). Are 20% B0, 20% Bunfished, and BMSY Valid as Reference Points for Fisheries Resource Management?. Open Access Library Journal, 4, e3897. doi: http://dx.doi.org/10.4236/oalib.1103897.
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