http://scholars.ntou.edu.tw/handle/123456789/17519
Title: | Vertical and horizontal movements of bigeye tuna (Thunnus obesus) in southeastern Taiwan | Authors: | Lin, Shian-Jhong Musyl, Michael K. Chiang, Wei-Chuan Wang, Sheng-Ping Su, Nan-Jay Chang, Ching-Tsun Chang, Qi-Xuan Ho, Yuan-Shing Kawabe, Ryo Yeh, Hsin-Ming Tseng, Chen-Te |
Keywords: | Mixed-layer;movement patterns;oxygen;psats;residence time;thermal niche;vertical speed | Issue Date: | 26-Dec-2020 | Publisher: | TAYLOR & FRANCIS LTD | Journal Volume: | 54 | Journal Issue: | 1 | Start page/Pages: | 1-21 | Source: | MARINE AND FRESHWATER BEHAVIOUR AND PHYSIOLOGY | Abstract: | To learn about the movement patterns of bigeye tuna in eastern Taiwan, pop-up satellite archival tags were attached on five tuna similar to 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 degrees C. During daytime, the fish spent the majority of time above 400 m at temperatures from similar to 10 - 25 degrees C and at nighttime; residency was largely confined to the mixed-layer from the surface to similar 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. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/17519 | ISSN: | 1023-6244 | DOI: | 10.1080/10236244.2020.1852878 |
Appears in Collections: | 環境生物與漁業科學學系 |
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