The Shoals of “ Katuwo ” and their Angling

Abstract

The shoal of “ Katuwo ” [Euthynnvs vagans (Lesson)] is often found associated with either sea-birds, drifting timbers, whales, sharks, or what not. The association with sea-birds or whales is almost characteristic to the shoals of this fish found in the districts south to Prov. Bôsyû, whereas the shoals associated with sharks are mostly distributed in the northern districts. Such difference of the distribution corresponds to that of oceanographical conditions, particularly of salinity (Figs. X, 2 and Tab. 1). © 1933, The Japanese Society of Fisheries Science. All rights reserved.