Abstract: Based on the statistical data of Chilean jack mackerel catch yield of “Kai Fu” vessel in March-December 2007 and the related sea surface temperature (SST) obtained by satellite remote sensing, this paper analyzed the seasonal changes of fish catch and net catch, and approached the relationship between the spatiotemporal distribution pattern of Chilean jack mackerel catch yield per unit effort (CPUE) and SST. The CPUE was higher in May-August and lower in other months, being in the order winter > autumn > spring > early summer. In the whole year, the catch yield of Chilean jack mackerel was higher when the SST was at 12 ℃-14 ℃, followed by at 15 ℃-17 ℃. The fishing grounds were distributed in higher altitudes (41°S-46°S) in autumn, and moved northward (34°S-42°S) and westward to 101°W in winter, continuously westward and then eastward (29° variation of longitude) in early spring, and southward in early summer. Overall, in 2007, there was an obvious seasonal change in the spatiotemporal distribution patterns of Chilean jack mackerel fishing grounds, and the CPUE value had a larger fluctuation range.

Key words: Long-term fertilization, NO₃^--accumulation, Soil moisture distribution, N uptake efficiency