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2013 Updated lobster catch-at-length data from the Tristan da Cunha fishery

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posted on 29.08.2022, 07:04 authored by Susan HollowaySusan Holloway

These catch-at-length (CAL) statistics are from the observer random samples of the commercial catch (both longline and powerboat). They represent the full size range of lobster landings i.e. include sublegal sizes, not only the legal sized portion of the catch.


The following statistics are presented graphically for each island and include:


1) Plots of the catch-at-length frequencies for the 2008 2011 seasons landings (Figure 1)

2) Plots of the average size of male lobsters in the landed catch since 1997 (Figure 2a) 

3) Plots of the average size of female lobsters in the landed catch since 1997 (Figure 2b)

4) Plots of the percentage females in the landed catch since 1997 (Figure 3)


Note that, for example, the 2007 season refers to the period Sept 2007 to Aug 2008. There is a notable downward trend in the average size of males at Inaccessible over recent years.

History

Department/Unit

Department of Mathematics and Applied Mathematics University of Cape Town