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Seasonal Characteristics of Todarodes pacificus Paralarval Distribution in the Northern East China Sea

북부 동중국해 살오징어(Todarodes pacificus) 유생분포의 계절특성

  • Received : 2013.10.01
  • Accepted : 2014.01.22
  • Published : 2014.02.28

Abstract

We conducted eight surveys in the northern East China Sea (ECS) in winter (February - April), summer (July), and autumn (October) 2004-2009, to investigate the seasonal distribution of T. pacificus. A total of 482 paralarvae, ranging in mantle length (ML) from 1.0 - 17.0 mm, were collected at 73 out of 181 stations. There were higher numbers of paralarvae during the winter and summer months than in the autumn. There was significant seasonal variation in the paralarval mantle lengths; mantle lengths were longer in winter (April) than in summer (July). The position of oceanic fronts in the study area played an important role in restricting paralarval distribution along the inshore edge of the Tsushima Warm Current (TWC). When the TWC expanded to western Jeju Island in winter and autumn, the paralarval distribution range extended to include western Jeju Island. However, when the TWC was located southeast of Jeju Island in the summer, paralarvae were distributed along the frontal zone off southeast Jeju Island. Sites at which paralarval mantle length was <2.0 mm ML indicated that the spawning ground were likely to be within the northern ECS in winter and summer, but north of the study area in autumn.

Keywords

Common squid;Distribution;Northern East China Sea;Paralarvae;Todarodes pacificus

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  2. Understanding interannual variability in the distribution of, and transport processes affecting, the early life stages of Todarodes pacificus using behavioral-hydrodynamic modeling approaches vol.138, 2015, https://doi.org/10.1016/j.pocean.2015.04.003
  3. Comparison of the Distribution of Demersal Fish Biomass Determined by Bottom Trawl and Hydroacoustic Surveys in the Northern East China Sea in Winter, 2014 vol.48, pp.6, 2015, https://doi.org/10.5657/KFAS.2015.0960

Acknowledgement

Grant : 첨단 해양탐사 시스템 활용 한반도 주변 해양변동 조사 및 운영

Supported by : 국립수산과학원