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Table 2 Correlation coefficients between catch and length of Pacific bluefin tuna, Thunnus orientalis, with environmental factors off the Jeju Island during 2004–2013

From: The relationship between fishing characteristics of Pacific bluefin tuna (Thunnus orientalis) and ocean conditions around Jeju Island

Environmental factors Monthly mean catch Monthly mean length
PDOI 0.856**
AOI 0.312
Seawater temperature at 0 m − 0.359 − 0.408
Seawater temperature at 50 m − 0.755** − 0.592**
Salinity at 0 m 0.048 0.194
Salinity at 50 m 0.409 0.443
Dissolved oxygen at 0 m 0.570 0.314
Dissolved oxygen at 50 m 0.500 0.325
  1. The numbers used for the climate indices (i.e., PDOI and AOI) and the seawater properties (temperature, salinity, and dissolved oxygen) were 12 (monthly) and 6 (bi-monthly), respectively
  2. **Indicates the significant level of 0.01