Response of winter cohort abundance of Japanese common squid <i>Todarodes pacificus</i> to the ENSO events

YU Wei; ZHANG Yang; CHEN Xinjun; YI Qian; QIAN Weiguo

doi:10.1007/s13131-018-1186-4

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Article Navigation > Acta Oceanologica Sinica > 2018 > 37(6): 61-71

YU Wei, ZHANG Yang, CHEN Xinjun, YI Qian, QIAN Weiguo. Response of winter cohort abundance of Japanese common squid Todarodes pacificus to the ENSO events[J]. Acta Oceanologica Sinica, 2018, 37(6): 61-71. doi: 10.1007/s13131-018-1186-4

Citation:

YU Wei, ZHANG Yang, CHEN Xinjun, YI Qian, QIAN Weiguo. Response of winter cohort abundance of Japanese common squid Todarodes pacificus to the ENSO events[J]. Acta Oceanologica Sinica, 2018, 37(6): 61-71. doi: 10.1007/s13131-018-1186-4

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Response of winter cohort abundance of Japanese common squid Todarodes pacificus to the ENSO events

doi: 10.1007/s13131-018-1186-4

1.
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, 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;Collaborative Innovation Center for Distant-water Fisheries, Shanghai 201306, China
2.
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
3.
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;Collaborative Innovation Center for Distant-water Fisheries, Shanghai 201306, China

Received Date: 2017-05-17
Rev Recd Date: 2017-12-29

Abstract

Abstract

The Japanese common squid Todarodes pacificus is an economically important species with one year lifespan, which is significantly influenced by climatic and environmental variability. According to the fishery data of the winter cohort of T. pacificus from 2003 to 2012, as well as environmental data and the Oceanic Niño index (ONI, which was defined by the sea surface temperature (SST) anomaly in the Niño 3.4 region), variations in the SST, chlorophyll a (Chl a) concentration, suitable spawning area (SSA) and sea surface height anomaly (SSHA) on the spawning ground of T. pacificus were examined under the El Niño and La Niña conditions. Their influences on squid abundance (defined by catch per unit effort, CPUE) were further assessed. The results showed that seasonal changes were found in SST, Chl a and SSA on the spawning ground of T. pacificus. Correlation analysis suggested that annual CPUE was significantly positively correlated with Chl a and SSA (p<0.05), but had insignificant relationship with SST (p>0.05). Moreover, the El Niño and La Niña events tended to dominate the changes of SSA and Chl a concentration in the key area between 25°-29°N and 122.5°-130.5°E, driving the variability of squid abundance. However, this influence varied with the intensity of each anomalous climatic event:the weak El Niño event occurred, the spawning ground was occupied by waters with enlarged SSA but with extremely low Chl a concentration, leading to low squid recruitment, the CPUE then decreased; the moderate intensity of El Niño event resulted in shrunk SSA but with high Chl a concentration on the spawning ground, the squid recruitment and CPUE increased; the moderate intensity of La Niña events yielded elevated SSA and high Chl a concentration on the spawning ground, the squid recruitment and CPUE dramatically increased. Our findings suggested that the ENSO events played crucial effects on the incubating and feeding conditions of the winter cohort of T. pacificus during the spawning season and ultimately affected its abundance.
- Todarodes pacificus,
- squid abundance,
- spawning ground,
- El Niño,
- La Niña

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References(41)

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