A juvenile index from biomass survey data

A number (12) of biomass surveys has been completed thus far at each of the four islands of the Tristan da Cunha group of islands. For each season there is usually a Leg 1 survey conducted around Aug/Sept and then a further Leg 2 survey conducted around Feb/Mar. This document aims at providing a brief summary of the number of juveniles either <60mm or <70mm CL in each sample (for Nightingale, Inaccessible and Tristan), and <70mm or <75mm CL for Gough. 

Note that the March 2011 surveys at the inner islands were conducted just prior to the OLIVA incident.