Diel Oscillations in Sailfish Vertical Movement Behavior in the East China Sea

Wei-Chuan Chiang ； Ryo Kawabe ； Michael K. Musyl ； Chi-Lu Sun ； Hsiao-Min Hung ； Hsien-Chung Lin ； Shun Watanabe ； Seishiro Furukawa ； Wen-Yie Chen ； Yu-Kai Chen ； Don-Chung Liu

《Journal of Marine Science and Technology》 21卷特刊 (2013/12) Pp. 267-273

https://doi.org/10.6119/JMST-013-1220-15

並列摘要

A sailfish (Istiophorus platypterus) was tagged with a pop-up satellite archival tag off the eastern coast of Taiwan and moved in a northerly direction to the East China Sea, where the tag popped-up after 160 days. The total linear displacement was 550 km from deployment to pop-up location and all movements were confined to the East China Sea. After the primarily southward movement during first two months at-liberty, the sailfish changed course after September and began to swim in a northerly direction paralleling the Kuroshio Current. During these horizontal movements, the tagged animal exhibited diel oscillations in its vertical diving behavior. On 22 days of the entire 160 days-at-liberty, the sailfish dove to depths deeper than 100 m. The sailfish spent ＞85% of its time in the upper uniformly mixed layer above ~50 m, but made more extensive vertical movements during the daytime ( x = 32.2 m ± 34.5 SD) than nighttime ( x = 9.5 m ± 16.7 SD). Depths and ambient water temperatures visited ranged from 0 to 153 m and 29.7°C to 17.8°C, respectively. The depth distribution appeared to be limited by ~6°C to 8°C changes in water temperature (Delta T) relative to sea surface temperature.

並列關鍵字

diel diving ； pop-up satellite archival tag ； mixed-layer depth ； temperature threshold

參考文獻

Andres, M., Wimbush, M., Park, J. H., Chang, K. I., Lim, B. H., Watts, D. R., Ichikawa, H., and Teague, W. J., “Observations of Kuroshio flow variations in the East China Sea,” Journal of Geophysical Research, Vol. 113 (C05013), pp. 1-14 (2008).

Arnold, G. and Dewar, H., “Electronic tags in marine fisheries research,” in: Sibert, J. R. and Nielsen, J. L. (Eds.), Tagging and Tracking Marine Fish with Electronic Devices, University of Hawaii, East-West Center, Kluwer Academic, pp. 7-64 (2001).

Bigelow, K. A., Hampton, J., and Miyabe, N., “Application of a habitat- based model to estimate effective longline fishing effort and relative abundance of Pacific bigeye tuna (Thunnus obesus),” Fisheries Oceanography, Vol. 11, pp. 143-155 (2002).

Block, B. A., Dewar, H., Farwell, C., and Prince, E. D., “A new satellite technology for tracking the movements of Atlantic bluefin tuna,” Proceedings of the National Academy of Sciences, Vol. 95, pp. 9384-9889 (1998).

Block, B. A., “Structure of the brain and eye heater tissue in marlins, sailfish, and spearfishes,” Journal of Morphology, Vol. 190, pp. 169-189 (1986).