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Preliminary Tristan Group Biomass Survey Leg1 results including data from the 2015 season

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posted on 28.02.2022, 05:13 by Susan HollowaySusan Holloway
This paper reports the updated biomass indices obtained from the annual (Leg1) biomass survey at each island. The index shows a slight overall downward trend for Inaccessible, which is also evident also for Tristan (but larger there) and for Gough (though there only for the more recent years). In contrast, there has been a sharp recent increase for Nightingale. There have been some changes over time in the size distribution, 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