Migratory route of Chilean jack mackerel Trachurus murphyi in Southeast Pacific
DING Peng, ZOU Xiaorong, FENG Chao, BAI Siqi
1.College of Marine Sciences,Shanghai Ocean University, Shanghai 201306, China; 2.Collaborative Innovation Center for National Distant-water Fisheries, Shanghai 201306, China; 3.Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai 201306, China; 4.National Distant-water Fisheries Engineering Research Center, Shanghai 201306, China; 5.Scientific Observing and Experimental Station of Oceanic Fishery Resources, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China
Abstract: The migration route of Chilean jack mackerel Trachurusmurphyi in Southeast Pacific was investigated by frequency distribution method and neural network based on the fishing data and biological data of Chilean jack mackerel obtained by Chinese large trawling fleets in the Southeast Pacific from 2000 to 2003, from 2007 to 2009, and 2016 and combining with the data of sea surface temperature (SST), sea surface salinity (SSS), chlorophyll a concentration (Chl-a). The results showed that the school with dominant fork length of 2-4 years old fish migrated westward from the coastal waters of Chile and Peru to reach the sea area near 39.5°S and 78°W in May, and that the fish school migrated to the northwest for feeding and overwintering. After reaching the sea area near 33°S and 85°W in October, the fish school turned to the southwest for feeding before spawning. From November to next March, they reached the spawning ground- the sea areas near 37°-39°S and 85°-88°W. From next March to April, the fish school moved from the spawning ground to the southwest. After reaching the sea area near 41°S and 87°W in next May, the fish school turned to the northwest for feeding and overwintering. After reaching the sea area near 36.5°S and 95°W in next October, the fish school turned to the southwest for feeding before spawning. The findings indicated that the fish school migrated to the northwest from May to October, and then turned to the southwest from October to April of the next year. Large Chilean jack mackerel at the same longitude tended to migrate to the south, while large Chilean jack mackerel at the same latitude tended to migrate to the west with an S shape westward migration.
2021, Vol. 36 
