遂次加入のある資源におけるパラメーターの推定-2-T値の最小化による同時推定法〔英文〕

概要

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1) The new estimating method (tracing method-a kind of simulation method) of population parameters is presented. Even when a fish population is supplied by sequential recruitment, it is possible to estimate population parameters which are not influenced by the effect of sequential recruitment. 2) The tracing index ( ?? ) is defined to indicated the goodness of tracing between the actual and simulated catch matrices. A set of the values of parameters which make the trace index minimum is accepted as the estimates. 3) Two methods of searching the minimum ?? used. One is the linear estimation to find the steepest descent direction, and the other is the quadratic estimation to locate the minimum point of ?? in its neighbourhood. 4) For numerical example, the natural mortality coefficients of Equatorial Pacific yellowfin tuna were estimated. Age groups were separated into one to four strata within which M was assumed to be constant, and the results were presented for each of one to four-factor estimations with some consideration on the validity of this method.
社団法人日本水産学会の論文