Yellowfin tuna of the Indian Ocean is overfished, and a better understanding stock structure needed to enable sustainable management. Here, otolith ?18O values young-of-the-year fish from known nursery areas equatorial (West, Central East) were used establish reference isotopic signature predict origin sub-adult adult individuals. Sub-adult Reunion Island similar West signature, but sub-adults ...

The seafood sector faces both socioeconomic and environmental sustainability challenges, as well pressure to demonstrate progress from governments, NGOs, retailers, consumers. To document data elements necessary in verifying key attributes fishery progress, the needs implement traceability systems accessible fishers other vulnerable near-shore actors. Implementation must overcome a suite of tec...

Tuna are endothermic fish with high metabolic rates, cardiac outputs and aerobic capacities. While tuna warm their skeletal muscle, viscera, brain and eyes, their hearts remain near ambient temperature, raising the possibility that cardiac performance may limit their thermal niches. We used an in situ perfused heart preparation to investigate the effects of acute temperature change and the effe...