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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.

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Department of Mathematics and Applied Mathematics, University of Cape Town