探索時間を考慮したまき網漁業の資源量指数について

抄録

In the case of purse seine fishery for aggregative pelagic fishes, School Size×School Density×Fishing Ground Area was suggested as a basis for the abundance index.
Catch per casting effort and reciprocal of searching time were thought to be proper indices for school size and school density, respectively. The equation for calculating the abundance index was shown and the relation between the variables were theoretically examined when the size of fishing ground changes, The above theory was trially applied to the data from sardine purse seine fishery in the southeast coast of Hokkaido and the validity of equation for variables of abundance index was supported.