Download FAR 2014/15 Acoustic and trawl estimates of orange roughy (Hoplostethus atlanticus) biomass on the southwest Challenger Plateau, June/July 2012

A trawl and acoustic survey of orange roughy on the southwest Challenger Plateau from FV Thomas Harrison in June/July 2012 showed roughy to be concentrated northeast of the Pinnacles. The trawl estimate was 26 043 t (CV 27%) significantly higher than estimates from surveys in 2006, 2010 and 2011, but significantly lower than the estimate of 46 480 t in 2009. The acoustic estimate of aggregated roughy on flat ground was 3 439 t (CV 22%) somewhat lower than the mean from the previous 5 surveys.