Vertical and horizontal movements of bigeye tuna (Thunnus obesus) in southeastern Taiwan,Marine and Freshwater Behaviour and Physiology

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Vertical and horizontal movements of bigeye tuna (Thunnus obesus) in southeastern Taiwan
Marine and Freshwater Behaviour and Physiology ( IF 1 ) Pub Date : 2020-12-24 , DOI: 10.1080/10236244.2020.1852878
Shian-Jhong Lin, Michael K. Musyl, Wei-Chuan Chiang, Sheng-Ping Wang, Nan-Jay Su, Ching-Tsun Chang, Qi-Xuan Chang, Yuan-Shing Ho, Ryo Kawabe, Hsin-Ming Yeh, Chen-Te Tseng

ABSTRACT To learn about the movement patterns of bigeye tuna in eastern Taiwan, pop-up satellite archival tags were attached on five tuna ~55 kg and prematurely detached and popped-up after 32 to 132 days-at-liberty. Two tags were physically recovered and provided fine-scale data archiving the full 47 and 132 days-at-liberty. The deepest descent recorded was 1,292 m and the coldest temperature visited 2.7°C. During daytime, the fish spent the majority of time above 400 m at temperatures from ~10 - 25°C and at nighttime; residency was largely confined to the mixed-layer from the surface to ~100 m. Vertical movements traversing through the thermocline during the daytime are based on physiological constraints and/or rapid directional changes conducive for optimal search strategies that increases the chances of prey encounters. Bigeye tuna appear to follow the diel vertical movements of prey organisms comprising the deep sound scattering layer to exploit them as a resource.

更新日期：2020-12-24

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