Movement behaviour of released wild and farm-raised dolphinfish Coryphaena hippurus tracked by pop-up satellite archival tags
To gauge the effectiveness of supplementing native populations of dolphinfish Coryphaena hippurus, we compared farm-raised and wild fish in terms of their horizontal and vertical movement patterns, habitat preferences and thermal niche using pop-up satellite archival tags (PSATs) deployed in two disparate locations: the sub-tropical southeastern coast of Taiwan (wild, n = 4), and temperate Kagoshima Bay, Japan (farm-raised, n = 3). Tagged fish were tracked for periods of 7–40 days, reached depths > 100 m, and experienced temperatures of 15–30 °C in Taiwan, and 20–23 °C in Kagoshima Bay. Fish tagged in Taiwan made primarily northward movements during early summer but changed to a southward course in early winter. In Kagoshima Bay, tagged fish undertook southward excursions along the coast and movements were confined to the bay. Dolphinfish spent > 50% of their time near the surface and made more extensive vertical movements during the night than during the day; vertical movements were largely confined to the mixed layer. Depth distributions appeared to be limited by a Δ6 °C change in temperature relative to sea surface temperature (i.e., > 90% of movements were within 6 °C of the warmest water available).
KeywordsDiel Habitat Kalman filter Most probable tracks Thermal niche
We thank Captain T. L. Lee of the Chang-Ue no. 1 longline fishing vessel for his skill in catching dolphinfish. In addition, we thank the following for field assistance: G. L. He, F. Y. Tsai, C. H. Chang, H. H. Hsu, C. T. Chang, Y. S. Ho and Kagoshima City Aquarium M. Nishino. This study was partially financially supported by the Fisheries Research Institute, Council of Agriculture, Taiwan [grant nos. 104AS-11.2.1-A1(2), 105AS-11.2.2-A1, 106AS-10.2.2-A1(5)] and the Japan Society for the Promotion of Science KAKENHI [grant no. 16H05795 (R. K.)].
Compliance with ethical standards
Conflicts of interest
The authors declare that they have no conflict of interest.
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