Fidelity of yellowfin tuna to seamount and island foraging grounds in the central South Atlantic Ocean

The yellowfin tuna (Thunnus albacares) is a widely distributed, migratory species that supports valuable commercial fisheries throughout their range. Management of requires knowledge movement, mixing and key life history parameters such as growth rate, natural mortality. Current management based on the assumptions highly populations are well mixed, but these have been questioned by recent studies. Since November 2015, tagged with conventional, archival pop-up satellite tags (PSAT) in South Atlantic Ocean around St Helena, goal better understanding movement patterns ecology this region. Conventional were attached to 4049 (size range 24–158 cm fork length, FL), PSAT deployed 15 inshore Helena waters 95–138 FL) 7 125–140 at Cardno Seamount, 48 69–111 FL). Most remained within 70 km release location, suggesting degree retention Although displacement was generally low, furthest distance travelled between recapture location 2755 km, other also displaying large-scale movements. Tagging revealed connections regions seamounts, links fishing putative spawning grounds Gulf Guinea.