1968 Volume 34 Issue 12 Pages 1078-1082
The authors studied monthly and annual variations of sea surface temperature and compared them with monthly and annual variations of hook rate, and obtained following results:
1. Sea surface temperature declined a little or remained about a same level from July to August/September and rose from August/September to December (Figs. 2 and 3).
2. Sea surface temperature rose from August/September to December and hook rate declined from July to October/November in sub-areas B, D and E. Both rose from July to December in sub-areas F and G and from September to December in sub-area C (Fig. 3).
3. Annual variation of sea surface temperature is different between sub-areas, though the temperature in each sub-area was generally high around 1956 or 1957 and around 1961 or 1962 (Fig. 4 and Table 1).
4. Annual variation of hook rate was not related directly with annual variation of sea surface temperature (Fig. 4).
