We recalculated krill biomass for the 2006 BROKE-West (CCAMLR Division 58.4.2) summer survey. The recalculation was carried out on the calibrated, multi-frequency acoustic data described in Jarvis et al. (2010) Deep-sea Res. Pt II 57:916-933. Biomass recalculation methods conformed to the CCAMLR guidelines - issued in 2010 via SG-ASAM. Our revised estimate of mean areal krill density is 20.5 gm-2 (CV = 0.16) cf. 21.9 gm-2 (CV=0.16) of Jarvis et al. (2010), which equates to a krill biomass, B0, of 28.43 (95% CI = 19.93 to 36.93) Mt cf. 28.75 (95% CI =19.63 to 37.87) Mt of Jarvis et al. (2010). Both the revised and Jarvis et al. (2010) point and variance estimates are practically identical.
Sarah Mackey (CCAMLR Secretariat)