逐次加入のある資源におけるパラメーターの推定について-V : 東西移動を考慮した太平洋海域キハダのパラメーターの同時推定

概要

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1. The population parameters with transfer effect were estimated by tracing method for Pacific yellowfin tuna. 2. In stead of the recruitment ratio (γR), the ratio of the number of fish which recruits to Subarea W to the total, an index of the recruitment ratio (ζ=ln{γR/(1-γR)}) was suggested. The value of ζ was estimated simultaneously with other parameters by the tracing method. 3. In simultaneous five-factor-estimation, following results were obtained; ?? =0.0583, îr=1.767 (r1=r5=0.0040, r2=r4=0.1845 and r3=0.6228), ?? =0.4440, ζ=3.565 (γR=0.9725) and ?? =0.1385. 4. When age groups were stratified for T, it was found that the older ages had larger value of T than that of younger ages. 5. Five factors (M21, M22, T21, T22 and ζ) were estimated for various levels of q and Ir, and the values which make ξ value minimum were as follows; ?? =0.051, Îr=1.682, ?? 21=0.3421, ?? 22=0.9146, ?? =3.614 (γR=0.9737), ?? 21=0.1440 and ?? 22=0.5439 (r1=r5=0.0058, r2=r4=0.1943 and r3=0.5996).
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