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Spatial-temporal distribution of Antarctic krill fishing ground and their relationship with sea surface temperature in waters around the South Shetland Islands.

RUAN Chao1,2, ZHANG Heng1*, CUI Xue-sen1, WU Yu-mei1, YANG Sheng-long1#br#   

  1. (1 Key Laboratory of East China Sea & Oceanic Fishery Resources Exploitation and Utilization, Ministry of Agriculture of China; East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China; 2 College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China).
  • Online:2016-09-10 Published:2016-09-10

Abstract: According to the data on the catch of the Antarctic krill in the Southern Ocean of 48.1 fishing area and sea surface temperature (SST) obtained by remote sensing method, this study analyzed the spatialtemporal distribution of catch per unit of fishing effort (CPUE) of the Antarctic krill and the relationship between CPUE with SST from 2010 to 2014. The results showed that the Antarctic krill fishery mainly distributed in the northeast of the South Shetland Islands (61°S-64°S, 58°W-60°W). Generally, there were obvious seasonal changes in CPUE of this fishery. The second higher value of CPUE appeared in December (about 16.0 t·h-1). Until February of the next year, the CPUE gradually decreased, and then an increasing trend was observed from February to April. The CPUE reached the highest value in April (about 16.5 t·h-1), and then began to decrease after April. From December to February of the following year, the fishery center moved towards the Southeast and there was a huge change in the fishery center. From February to May, it roughly moved to the West and arrived at its southern end. A slight change of fishery center happened from March to May, mainly at 63°S-63.5°S, 58.5°W-59.5°W. Moreover, in June, October and December, the fishery center gradually developed northward and reached the northernmost or easternmost part in December. On the whole, the suitable SST values of 48.1 fishery in Antarctic krill fishing areas ranged from -0.1 to 1.2 ℃. It was suggested that summer and autumn (from December to May in the next year) were the main fishing seasons due to the suitable SST.

Key words: uptake rate, Michaelis constant., cadmium pollution, rice