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Article

Feeding Ecology of Common Squid Todarodes pacificus in the South Sea of Korea Determined through Stable Isotope and Stomach Content Analyses

by
Donghoon Shin
1,†,
Tae Hee Park
2,†,
Chung-Il Lee
2,
Jun Hyung Jo
1,
Chang Geun Choi
3,
Sukyung Kang
1 and
Hyun Je Park
2,*
1
Fisheries Resources Research Center, National Institute of Fisheries Science, Tongyeong 53064, Korea
2
Department of Marine Ecology and Environment, Gangneung-Wonju National University, Gangneung 25457, Korea
3
Department of Ecological Engineering, Pukyong National University, Busan 48513, Korea
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Water 2022, 14(19), 3159; https://doi.org/10.3390/w14193159
Submission received: 4 August 2022 / Revised: 26 September 2022 / Accepted: 5 October 2022 / Published: 7 October 2022
(This article belongs to the Special Issue Application of Stable Isotopes in Marine Ecosystems)
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Abstract

The common squid Todarodes pacificus is a dominant species within epipelagic communities and an important commercial species in the South and East seas of Korea and in the East China Sea. In this study, to examine the dietary composition, trophic position, and ontogenetic dietary shifts of the common squid, we analyzed stomach contents and stable isotope values (δ13C and δ15N) in muscle tissue across different body sizes (mantle length, ML) and seasons (winter, spring, and summer 2021) in the South Sea of Korea. Regardless of the season, the diet of the common squid predominantly comprised Pisces (37.9–94.0%) and Cephalopoda (6.0–61.0%). However, in the smallest individuals (ML < 10 cm), the stomach contents in August primarily comprised Crustacea (95.5%), thereby indicating a seasonal difference in dietary composition and ontogenetic dietary shifts only during summer. Similarly, our isotope results revealed seasonal isotopic variation among sampling periods and significant positive correlations between ML and both δ13C and δ15N values during the summer. These results reveal a seasonal variability in major diet components among the common squid of different size classes and that their feeding strategies are probably adjusted in response to the temporal availability of prey. Collectively, the findings of this study enhance our understanding of the feeding ecology of T. pacificus and thereby provide valuable information that will contribute to the ecological fishery management of this commercially important species.
Keywords: Ommastrephidae; stomach composition; stable isotope; feeding strategy; trophic position; ontogenetic dietary shift Ommastrephidae; stomach composition; stable isotope; feeding strategy; trophic position; ontogenetic dietary shift

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MDPI and ACS Style

Shin, D.; Park, T.H.; Lee, C.-I.; Jo, J.H.; Choi, C.G.; Kang, S.; Park, H.J. Feeding Ecology of Common Squid Todarodes pacificus in the South Sea of Korea Determined through Stable Isotope and Stomach Content Analyses. Water 2022, 14, 3159. https://doi.org/10.3390/w14193159

AMA Style

Shin D, Park TH, Lee C-I, Jo JH, Choi CG, Kang S, Park HJ. Feeding Ecology of Common Squid Todarodes pacificus in the South Sea of Korea Determined through Stable Isotope and Stomach Content Analyses. Water. 2022; 14(19):3159. https://doi.org/10.3390/w14193159

Chicago/Turabian Style

Shin, Donghoon, Tae Hee Park, Chung-Il Lee, Jun Hyung Jo, Chang Geun Choi, Sukyung Kang, and Hyun Je Park. 2022. "Feeding Ecology of Common Squid Todarodes pacificus in the South Sea of Korea Determined through Stable Isotope and Stomach Content Analyses" Water 14, no. 19: 3159. https://doi.org/10.3390/w14193159

APA Style

Shin, D., Park, T. H., Lee, C.-I., Jo, J. H., Choi, C. G., Kang, S., & Park, H. J. (2022). Feeding Ecology of Common Squid Todarodes pacificus in the South Sea of Korea Determined through Stable Isotope and Stomach Content Analyses. Water, 14(19), 3159. https://doi.org/10.3390/w14193159

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