抄録
Average catch per boat per voyage as well as the average body-weight of Thunnus orientalis (T. & S.) fished during every decade of the months in the seas south of Kyûsyû was investi-gated with the daily records of the landings from long-line fishing-boats for tunny at the two ports Aburatu and Nango from Dec. 1934 to June 1939, as basis.
Generally speaking, larger fishes appearing early in the fishing season gradually give place to the smaller-sized. Minor fluctuations in the average body-weight, however, can be recog-nized as follows: -
Season: From mid-Dec. to early Jan., Early and mid-Feb., Mid to late March, Late April, Towards mid-June.
Aver weight: ca. 55 K wan (206kg), ca. 45 ?? (169kg), ca. 52 ?? (195kg), ca. 40 ?? (150kg), ca. 47 ?? (176kg)
Hauls: At the begin-ning of hauls, With earlier good hauls, With later good hauls, Towards, and At the end of hauls.
