Journal of Dalian Ocean University  2024, Vol. 39 Issue (1): 144-152 DOI: 10.16535/j.cnki.dlhyxb.2023-106 |
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| Kinetics on effect of Kuroshio axis meander on the resource recruitment of neon flying squid (Ommastrephes bartramii) in the Northwest Pacific Ocean |
| XU Zhixin，LI Yuesong*，PAN Lingzhi，YU We，ZHANG Yu
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| 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.Collaborative Innovation Center for Distant-water Fisheries，Shanghai 201306，China；5.East China Sea Forecasting Center，State Oceanic Administration，Shanghai 200081，China |
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Abstract In order to evaluate the effect of physical environment changes caused by the meander of the Kuroshio axis on the resource recruitment of neon flying squid (Ommastrephes bartarmii), the transport distribution and resource recruitment of the early life history stage (70 d) of the winter-spring cohorts of O.bartarmii were simulated in the Northwest Pacific Ocean by the physical model (FVCOM-Global ) coupled with the individual model (IBM). The correlation between the large and small meander paths and the resource recruitment of the squid was judged by using the southernmost point of the center of gravity of the Kuroshio main axis of 140°E in March, which was located south of 32°N. The results showed that there was an interannual fluctuation in the recruitment of the squid in the Northwest Pacific Ocean from 2007 to 2016, which was significantly correlated with the Kuroshio axis meander in March (R2=0.71). In other words, in the year of small meander, the larvae and juveniles of the squid were transported northward or northeastward, north of 25°N and east of 145°E. The higher the proportion of the neon flying squid larvae, and juveniles distributed in this sea area were, the higher the relative recruitment was, with a good positive correlation (R2=0.89). The Kuroshio warm current produced in the process was obvious in the sea area north of 25°N. When the flow rate was 0.2-0.6 m/s, the distribution of larvae and juveniles of the neon flying squid in the sea area was denser at average water temperature of 20.2 ℃ and the northerly isotherm. In the vertical distribution, there was a positive correlation between the vertical distribution and recruitment of different years (R2=0.65). The findings indicated that the meander of the Kuroshio axis in March was one of the key factors affecting the recruitment of neon flying squid resources, which also provides a scientific basis for predicting the abundance of the resources in that year.
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Published: 13 March 2024
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