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Final Tristan Group Biomass Survey Leg1 results including data from the 2014 season

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posted on 28.02.2022, 05:04 authored by Susan HollowaySusan Holloway
This paper summarises key features of the results from the Leg 1 biomass surveys carried out since 2006 at each island in the Tristan group. Specifically the biomass index, catch at length distribution and female-percentage-in-the-catch trends are presented. The index shows fairly stable trends for Inaccessible and Gough. The trend at Tristan has been down for three years but is stable showing a slight increase for 2014. In contrast, there has been a sharp recent increase for Nightingale since 2011. There have been some changes over time in the length distributions, the most marked of which is a steady decrease in the mean length at Tristan. The percentage of females in the catch at Gough is about double that at the other islands.



Department of Mathematics and Applied Mathematics, University of Cape Town