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

抄録

1. The population parameters with transfer effect were estimated by tracing method for Pacific yellowfin tuna.
2. In stead of the recruitment ratio (γ_R), the ratio of the number of fish which recruits to Subarea W to the total, an index of the recruitment ratio (ζ=ln{γ_R/(1-γ_R)}) 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, î_r=1.767 (r₁=r₅=0.0040, r₂=r₄=0.1845 and r₃=0.6228), ?? =0.4440, ζ=3.565 (γ_R=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, Î_r=1.682, ?? ₂₁=0.3421, ?? ₂₂=0.9146, ?? =3.614 (γ_R=0.9737), ?? ₂₁=0.1440 and ?? ₂₂=0.5439 (r₁=r₅=0.0058, r₂=r₄=0.1943 and r₃=0.5996).