Studies on Mackerel Angling Fisheries-IV. Fluctuation of the Fishing Ability of Mackerel Tenbin Angling Boats, Occurring with the Change of Gear and Fish

Abstract

The mackerel small Tenbin angling (balance line angling) boats based on Katsuyama harbour in Chiba Prefecture are operating in Tokyo Bay through a whole year, changing season to season gear and kinds of fish to be caught as follows, mackerel pole and line fishing, squid angling miscellaneous angling (line fishing for sea bream, troll fishing for yellowtail, vertical long line for blue fishes and etc.). In this study, whether the fishing ability of the boats will be fluctuated or not by the change of gear and fish were investigated on selected twenty boats operating over 100 days a year from the ones based on Katsuyama. In three kinds of the fisheries, mackerel Tenbin angling, mackerel pole and line fishing and squid angling, the correspondent degree of good or worse catch in any combination of two kind of the fisheries was high, especially remarkable between the Tenbin angling and the pole and line fishing for mackerel, due to, perhaps, the reason that the fishermen well know the behaviour of the fish. In miscellaneous angling, however, such relation was not found. © 1968, The Japanese Society of Fisheries Science. All rights reserved.