American Journal of Marine Science
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American Journal of Marine Science. 2021, 9(1), 16-25
DOI: 10.12691/marine-9-1-4
Open AccessArticle

Quantitative Relationships between Autumn Catches of Swordtip Squid (Uroteuthis edulis) and Oceanic Conditions to the East of Tsushima Islands, Japan

Tadanori Yamaguchi1, , Katsumi Takayama2 and Naoki Hirose2

1Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan

2Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan

Pub. Date: November 26, 2021

Cite this paper:
Tadanori Yamaguchi, Katsumi Takayama and Naoki Hirose. Quantitative Relationships between Autumn Catches of Swordtip Squid (Uroteuthis edulis) and Oceanic Conditions to the East of Tsushima Islands, Japan. American Journal of Marine Science. 2021; 9(1):16-25. doi: 10.12691/marine-9-1-4

Abstract

Although the behavior of swordtip squid (Uroteuthis edulis) caught in the southern Japan Sea and eastern channel of the Tsushima Strait in autumn have been estimated, it needed to be improved in scientific and fishery benefits, which were a harvest scenario and the reason for serious poor catches in the autumn of 2019. This study aimed to identify oceanic conditions affecting autumn catches using a numerical ocean model. To determine the effects of eddies that occurred in the waters to the east of the Tsushima Islands, Lagrangian tracers were released and the number of tracers remaining in the waters, where the squid of the autumn migrating group are supposed to grow in summer, were counted regularly. Quantitative results in the tracer experiments supported and improved the hypothesis of the migratory behavior of the autumn group. The regression expression was obtained with 0.851 of correlation coefficient between the catch per unit effort (CPUE) in autumn and the index composed from the number of the remaining tracers in summer and the CPUE of May. In the summer of 2019, a U-shaped current occurred from the north to the east of the islands, which perhaps accounted for the poor catches in the autumn.

Keywords:
data assimilation model Lagrangian tracer experiment current eddy CPUE

Creative CommonsThis work is licensed under a Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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References:

[1]  Jereb, P. and Roper, C.F., “Cephalopods of the world. An annotated and illustrated catalogue of cephalopod species known to date”. Volume 2. Myopsid and Oegopsid Squids. FAO, 2010.
 
[2]  Arkhipkin, A.I., Rodhouse, P.G., Pierce, G.J., Sauer, W, Sakai, M., Allcock, L., Arguelles, J., Bower, J.R., Castillo, G., Ceriola, L., et al., “World squid fisheries”. Reviews in Fisheries Science & Aquaculture, 23(2):92-252, 2015.
 
[3]  Okutani, T., “Past, present and future studies on cephalopod diversity in tropical West pacific”. Phuket marine Biology Center Research Bulletin, 66:39-50, 2005.
 
[4]  Ando, A., Nakata, H. and Ishizaka, J., “Influence of Tsushima Warm Current on the fishing ground formation of swordtip squid (Photololigo edulis) in the Sea of Genkai, Japan”. Bulletin of the Japanese Society of Fisheries Oceanography, 77(2): 83-91, 2013 (in Japanese with English abstract).
 
[5]  Kanamoto, Y. and Shibata, Y., “Investigation of factors affecting CPUE of swordtip squid Uroteuthis edulis in coastal waters of Shimane Prefecture and forecast”. Nippon Suisan Gakkaishi, 86(5):371-385, 2020 (in Japanese with English abstract).
 
[6]  Shimada, Y., “Movement of fishing boats with fishing lights in the Tsushima Strait in summer and fall using nighttime light satellite images”. Journal of Japan Society of Civil Engineers, 75(2):1025-1030, 2019 (in Japanese with English abstract).
 
[7]  Yamaguchi, T., Kawakami, Y. and Matsuyama, M., “Migratory routes of the swordtip squid Uroteuthis edulis inferred from statolith analysis”. Aquatic Biology, 24:53-60, 2015.
 
[8]  Yamaguchi, T., Takayama, K., Hirose, N. and Matsuyama, M., “Migratory routes of different sized swordtip squid (Uroteuthis edulis) caught in the Tsushima Strait”. Fisheries Research, 209:24-31, 2019.
 
[9]  Yamaguchi, T., Takayama, K., Hirose, N. and Matsuyama, M., “The Sea of Amakusa playing the role of a distributor of swordtip squid (Uroteuthis edulis) migrating from the East China Sea to the east and west sides of Japan”. Fisheries Research, 225:105475, 2020.
 
[10]  Yamaguchi, T., Kawakami, Y. and Matsuyama, M., “Analysis of the hatching site and migratory behaviour of the swordtip squid (Uroteuthis edulis) caught in the Japan Sea and Tsushima Strait in autumn estimated by statolith analysis”. Marine Biology Research, 14(1):105-112, 2017.
 
[11]  Takikawa, T, Yoon, J.H. and Cho, K.D., “The Tsushima warm current through Tsushima Straits estimated from ferryboat ADCP data”. Journal of Physical Oceanography, 35(6):1154-1168, 2005.
 
[12]  Hirose N, Takayama K, Moon J.H., “Regional data assimilation system extended to the East Asian marginal seas”. Sea and sky, 89(2): 1-9, 2013.
 
[13]  Kako, Y., Sakai, M., Mmasujima, M., Okazak, M., Igarashi, H., Masuda, S. and Awaji, T., “Effects of hydrographic conditions on the transport of neon flying squid Ommastrephes bartramii larvae in the North Pacific Ocean”. Hidrobiológica, 24(1):33-38, 2014.
 
[14]  Yamaguchi, T., Aketagawa, T., Miyamoto, M., Hirose, N. and Matsuyama, M., “The use of statolith analyses and particle-tracking experiments to reveal the migratory routes of the swordtip squid (Uroteuthis edulis) caught on the Pacific side of Japan”. Fisheries Oceanography, 27:517-524, 2018.
 
[15]  Yamaguchi, T., Hirose, N. and Kim, J., “Annual migration of the Japanese common squid (Todarodes pacificus) traced using a data assimilation model”. (submitted).