Abstract
Supposing that the relationship between In C(t) and E(t) is a simple regression, the author introduced an equation which gives the confidence limits corresponding to the estimate ob-tained by DELURY's logarithmic catch-effort method. The (1-α)% confidence limits for N are given by the roots of the quadratic equation: N2[ ?? 2-tα2s2(c22-2 ?? c12+ ?? c11)]-2 ?? • ?? •N+ ?? 2=0 where tα is the value of t at the α% level for n-2 d. f. and c11, c12 and c22 are the elements of inverse matrix of the normal equations which determine k and In (kN). The author ascertained that the equation is available to roughly check the accuracy of estimate, by comparing the confidence limits calculated by this method with that obtained from K(t)-C(t) relationship; the source of data being that of Japanese common goby, Acanthogo-bius flavimanus in the northern part of the Tokyo Bay.
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