Fishing ground distribution of saury and its correlation with marine environment factors in the Northern Parcific hign sea in 2013

Abstract:

Based on the catch data collected by Chinese Pacific saury fishing vessels from July to December 2013 and sea surface temperature(SST), chlorophyll-a concentration(Chl.a) and sea surface height(SSH) data derived from satellites, this paper analyzed the distribution of fishing ground of Pacific saury and their relationship with marine environmental factors by using the method of fisheries geographic information system software and mathematical statistics. The results indicated that the production varies with the season, and it was the highest between September and November in the waters near 40°N-47°N,147.5°E-162°E. The movement of barycenter of catch could be divided into three stages: first, it had a tendency to move from south to north in July and August; afterwards, it moved from northwest to southeast in August and October; finally, it moved from west to east from October to December. The range of SST, Chl.a, SSH in the fishing grounds were 10-15 ℃, 0.5-1.0 mg/m³, 0-±2 0 cm respectively, and the optimum ranges of above three factors were 11-13 ℃, 0.6-0.8 mg/m³, 5-±15 cm respectively. According to K-S test(P<0.01), the ranges of SST, Chl.a, SSH in each month are reasonable, and SST, Chl.a, SSH can be chosen as indicators to predict the fishing ground of saury.