An integrated stock assessment for the Heard Island and the McDonald Islands Patagonian toothfish (Dissostichus eleginoides) fishery in CCAMLR Division 58.5.2

• Other Authors: ZIEGLER, PHILIPPE (hasPrincipalInvestigator), ZIEGLER, PHILIPPE (processor), Australian Antarctic Data Centre (publisher)
• Format: Dataset
• Language: unknown
• Published: Australian Antarctic Data Centre
• Subjects: biota; oceans; FISH; EARTH SCIENCE; BIOLOGICAL CLASSIFICATION; ANIMALS/VERTEBRATES; FISHERIES; AQUATIC SCIENCES; POPULATION DYNAMICS; BIOSPHERE; ECOLOGICAL DYNAMICS; SPECIES/POPULATION INTERACTIONS; CASAL MODEL FRAMEWORK; STOCK ASSESSMENT; MODELS; EARTH SCIENCE SERVICES; GEOGRAPHIC REGION > POLAR; OCEAN > SOUTHERN OCEAN > HEARD AND MCDONALD ISLANDS; Heard; Heard Island; McDonald Islands; Southern Ocean; Patagonian Toothfish
• Online Access: https://researchdata.ands.org.au/an-integrated-stock-division-5852/698973; https://data.aad.gov.au/metadata/records/AAS_4030_ToothfishAssessment; http://nla.gov.au/nla.party-617536

This integrated stock assessment for the Patagonian toothfish (Dissostichus eleginoides) fishery at the Heard Island and the McDonald Islands in CCAMLR Division 58.5.2, with data until end of July 2015, is based on the best available estimates of model parameters, the use of abundance estimates from a random stratified trawl survey (RSTS), longline tag-release data from 2012-2014 and longline tag-recapture data from 2013-2015, and auxiliary commercial composition data to aid with the estimation of year class strength and selectivity functions of the trawl, longline and trap sub-fisheries.All model runs were conducted with CASAL version 2.30-2012-03-21 (Bull et al. 2012). The assessment model leads to an MCMC estimate of the virgin spawning stock biomass B0 = 87 077 tonnes (95% CI: 78 500-97 547 tonnes). Estimated SSB status in 2015 was 0.64 (95% CI: 0.59-0.69). Using this model, a catch limit of 3405 tonnes satisfies the CCAMLR decision rules. Similarly to the 2014 assessment, the projected stock remains above the target level for the entire projection period.