Download FAR 2018/41 – Trawl survey of hoki and middle-depth species on the Chatham Rise, January 2018 (TAN1801)

The 25th trawl survey in a time series to estimate the relative biomass of hoki and other species on the Chatham Rise was carried out from 4 January to 3 February 2018. Estimated biomass of hoki in core (200–800 m) strata was 122 097 t (CV 16%), an increase of 7% from 2016. This increase was largely driven by the biomass estimates for 1+ (2016 year class) and 2+ (2015 year-class) hoki. The biomass of hoki ages 3+ years and older declined by 26% from that in 2016. The 2018 survey again covered 200–1300 m depths around the entire Rise and biomass estimates are provided for 49 species.