Population, age, growth and maturation characteristics of orange back flying squid Sthenoteuthis pteropus in Eastern Central Atlantic Ocean
ZHANG Xinhao, LIU Bilin*, LI Gang, YU Han
1.College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China; 2.National Engineering Research Center for Oceanic Fisheries, Shanghai 201306, China; 3.Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai 201306, China; 4.Key Laboratory of Oceanic Fisheries Exploration, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China; 5.Scientific Observing and Experimental Station of Oceanic Fishery Resources, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China
Abstract: In order to understanding of the fishery biology of orange back flying squid Sthenoteuthispteropus, the age, growth and maturation were analyzed in 682 samples of orange back flying squid collected by Chinese squid jigging vessels in the Eastern Central Atlantic Ocean in May, 2020. The results showed that the samples had mantle length from 124 mm to 580 mm, with the dominant group from 200 mm to 399 mm. The sample orange back flying squid had body weight from 80 g to 6 365 g, with the dominant group from 0 g to 1 999 g. The age of the samples was ranged from 105 days to 365 days old, with the dominant group ranging from 100 to 249 days, accounting for about 80.20% of the total. According to the calculation of the age of statoliths and the date of fishing, the orange back flying squid had mantle length of 370 mm at first maturity and the samples were hatched from May 2019 to February 2020 with the peak period from November to January, mainly for autumn and winter populations. The mantle length growth of the samples was shown to conform to the Logistic model, with average IGR of 0.45%/d and AGR of 0.77 mm/d in the mantle length, and the average IGR of 1.21%/d and AGR of 13.93 g/d in the body weight. The basic biological characteristics of orange back flying squid obtained in present study provided fundamental data for China to rationally develop orange back flying squid resources in Eastern Central Atlantic Ocean.
2022, Vol. 37 
