Open AccessSeasonal variation in fish school spatial distribution and abundance under the Kuroshio regular pattern and the large meander in Suzu coastal waters
Author(s) -
Yanhui Zhu,
Kenji Minami,
Yuka Iwahara,
Kentaro Oda,
Koichi Hidaka,
Osamu Hoson,
Koji Morishita,
Masahito Hirota,
Sentaro Tsuru,
Hokuto Shirakawa,
Kazushi Miyashita
Publication year - 2021
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0260629
Subject(s) - meander (mathematics) , pelagic zone , fishery , abundance (ecology) , environmental science , spatial distribution , oceanography , seasonality , fish <actinopterygii> , echo sounding , geography , ecology , biology , geology , remote sensing , mathematics , geometry
The Kuroshio Current can take two paths; usually it follows the regular pattern but occasionally it follows a pattern known as the large meander. In this study, we investigated the abundance of fish that migrate to coastal waters and the spatial distribution of fish schools under both Kuroshio patterns in Suzu district, Kochi prefecture, where the set net is the main fishery industry. We clarified the seasonal variation in the density and distribution of fish schools using a quantitative echo sounder. The effects of the Kuroshio large meander (LM) depended on the season. There was no effect of current pattern in summer or autumn, but in winter and spring the LM altered the marine environment and fish distributions. Cold water masses were formed in the survey area during winter and spring during the LM, and the water temperature dropped significantly compared with during the Kuroshio non-large meander (NLM). This altered the fish species and the distribution of fish schools in the survey area. The catches of Japanese horse mackerels ( Trachurus japonicus ) and Yellowtails ( Seriola quinqueradiata ) were much higher during the LM compared with those during the NLM. Unlike these two species, the small-sized pelagic fishes in spring has decreased significantly during the LM.