Swordtip squid (Uroteuthis edulis) is one of the important economical fishing target species in the East China Sea. Uroteuthis edulis is characterized by rapid growth, extensive migration, and long spawning period and sensitive tosurrounding environment. In order to assess its stock status, it is necessary to explore its spawning season, growthpatterns of different populations and their relationship with the environment in advance. In this paper, based onthe samples of U. edulis collected in the East China Sea from September 2017 to March 2018, we explored therelationships between daily growth of statolith microstructure and environmental variables by gradient forestmethod and generalized additive model. The spawning season of U. edulis was found to be nearly one year, andtwo dominant season groups were found: the spring group with the peak period of April and the summer groupwith the peak period of August. Water temperature in the depth of 25 m (Temp 25), sea surface temperature (SST)and zonal velocity were the key environmental variables for the daily growth of April-spawning group. The mostsuitable environmental conditions for the growth of April-spawning group were water temperature (24?27°C) andvelocity (0.1?0.3 m/s). SST, Temp 25 and mixed layer depth were the key environment variables for the dailygrowth of August-spawning group. The most suitable environmental conditions for the growth of Augustspawninggroup were water temperature (21?28°C) and water depth (0?50 m). Key environmental variables ofdifferent groups suggested that early growth was significantly affected by seasonal changes of water temperature,current velocity and prey abundance. This study explored the relationships between early growth andenvironmental variables and provided the scientific guidance for the management and conservation of U. edulis.

Nan Li;Yan Wang;Zhou Fang;Xinjun Chen;Zhiping Feng

College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;National Engineering Research Center for Oceanic Fisheries, Shanghai Ocean University, Shanghai 201306, China;Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources of Ministry of Education, Shanghai Ocean University, Shanghai 201306, China;Key Laboratory of Oceanic Fisheries Exploration, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China;Scientific Observing and Experimental Station of Oceanic Fishery Resources, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China

海洋学报（英文版）

[1]Nan Li;Yan Wang;Zhou Fang;Xinjun Chen;Zhiping Feng-.Relationships between daily growth of different groups of sword-tip squid (Uroteuthis edulis) and environmental variables in the East China Sea)[J].海洋学报（英文版）,2022(08):52-61

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