@article{oai:ir.kagoshima-u.ac.jp:00010540, author = {盛田, 友弌}, journal = {鹿児島大学水産学部紀要, Memoirs of the Faculty of Fisheries, Kagoshima University}, month = {Dec}, note = {As to the tuna long-line gear two facts were already clarified, first, that under the sea water it forms a kind of catenary; and, second, that the sinking degree of each hook is to be influenced by the shifting position of the connecting point of the hook on the main line. By making a statistical research on the catch data from some examination facilities, the following results were obtained: 1) In case of using the gear consisted of the same build, though this is a quite natural process, the more its sinking degree increases in depth the more became large its catch rates. 2) The main factor of the above mentioned phenomenon was considered to be attributed to the varying degree of eating reaction of tuna to the each hook of gear rather than to the different density in the swimming rayer.}, pages = {30--35}, title = {マグロ延縄漁具の構造による漁獲性能に関する研究(第1報) : 延縄漁具における釣鉤の深度別漁獲の相違について}, volume = {5}, year = {1956} }