Age and growth of slender tuna (Allothunnus fallai) in an unexploited temperate population

Many large predatory fishes are in decline and tuna sustainability is high on the global agenda. Slender tuna (SLT), Allothunnus fallai, is data-poor and a rare contemporary example of a globally unexploited temperate tuna. This study analysed 214 otoliths for age and growth of fish collected in the South Atlantic. Observed ages varied between 9 and 42 years for a size range of 68–90 cm fork length. We reveal important life history data for SLT before exploitation and underline the relevance of data-poor stocks in understanding wider questions for exploited tuna.