Comparison of nominal and standardized catch per unit effort data in quantifying habitat suitability of skipjack tuna in the equatorial Pacific Ocean

Cheng Zhou; Yuanyuan Hu; Jie Cao; Liuxiong Xu; Xuefang Wang; Rong Wan; Yu Xiao; Jiangfeng Zhu; Hao Tang

doi:10.1007/s13131-021-1922-z

Volume 41 Issue 3

Mar. 2022

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Cheng Zhou, Yuanyuan Hu, Jie Cao, Liuxiong Xu, Xuefang Wang, Rong Wan, Yu Xiao, Jiangfeng Zhu, Hao Tang. Comparison of nominal and standardized catch per unit effort data in quantifying habitat suitability of skipjack tuna in the equatorial Pacific Ocean[J]. Acta Oceanologica Sinica, 2022, 41(3): 1-10. doi: 10.1007/s13131-021-1922-z

Citation:

Cheng Zhou, Yuanyuan Hu, Jie Cao, Liuxiong Xu, Xuefang Wang, Rong Wan, Yu Xiao, Jiangfeng Zhu, Hao Tang. Comparison of nominal and standardized catch per unit effort data in quantifying habitat suitability of skipjack tuna in the equatorial Pacific Ocean[J]. Acta Oceanologica Sinica, 2022, 41(3): 1-10. doi: 10.1007/s13131-021-1922-z

Citation:

Cheng Zhou, Yuanyuan Hu, Jie Cao, Liuxiong Xu, Xuefang Wang, Rong Wan, Yu Xiao, Jiangfeng Zhu, Hao Tang. Comparison of nominal and standardized catch per unit effort data in quantifying habitat suitability of skipjack tuna in the equatorial Pacific Ocean[J]. Acta Oceanologica Sinica, 2022, 41(3): 1-10. doi: 10.1007/s13131-021-1922-z

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Comparison of nominal and standardized catch per unit effort data in quantifying habitat suitability of skipjack tuna in the equatorial Pacific Ocean

doi: 10.1007/s13131-021-1922-z

Cheng Zhou^{1, 2},
Yuanyuan Hu^{1, 2},
Jie Cao³,
Liuxiong Xu^{1, 2},
Xuefang Wang^{1, 2
,
,},
Rong Wan^{1, 2},
Yu Xiao^{1, 2},
Jiangfeng Zhu^{1, 2},
Hao Tang^{1, 2}

1.
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
2.
National Engineering Research Center for Oceanic Fisheries, Shanghai 201306, China
3.
Department of Applied Ecology, Center for Marine Sciences and Technology, North Carolina State University, Morehead City, NC 28557, USA

Funds: The National Key R&D Program of China under contract Nos 2020YFD0901202 and 2019YFD0901502; the National Natural Science Foundation of China under contract Nos 41806110, 41506151 and 31902426.

More Information

Corresponding author: E-mail: xfwang@shou.edu.cn
Received Date: 2020-12-18
Accepted Date: 2021-02-11

Available Online: 2021-11-11

Publish Date: 2022-03-01

Abstract

Abstract

In the western and central Pacific Ocean, upper strata waters exhibit highly dynamic oceanographic features under ENSO variability. This has been proved to be responsible for the dynamic change of both abundance and zonal distribution of skipjack tuna (Katsuwonus pelamis). Although causality has been suggested by researchers using physical–biological interaction models, cumulative evidence needs to be obtained and the tenability of assertion needs to be tested from an ecological habitat perspective, based on fisheries data. For purse seine fishery, the use of catch per unit effort (CPUE) as an indication of the abundance is confusing because of technical improvements over the whole exploitation history and unbalanced individual fishing characteristic of vessels. It is particularly interesting to discriminate between habitat characteristics in comparative scenarios of CPUE application. This study identified habitat traits based on a series of oceanographic factors from a global ocean reanalysis model. A comparison was conducted between two habitat models based on unprocessed purse seine CPUE and standardized CPUE considering fishing characteristics. The results suggest that standardized CPUE could model the regular zonal shift of habitat compatible with the observed fishing efforts transfer, and achieved better prediction capacity than unprocessed CPUE. Furthermore, the habitat of skipjack tuna was also characterized and linked with surface and subsurface thermal environment, ocean current, dissolved oxygen, biotic environment, and ENSO variability. The monthly-averaged habitat suitable index, derived from the optimal habitat model prediction, showed a significant linear relationship with the southern oscillation index, which suggested that El Niño episodes eventually provide more preferable habitat for skipjack tuna under ENSO variability.
- skipjack tuna,
- free-swimming schools,
- habitat characteristics,
- ENSO events,
- CPUE standardization

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References(47)

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