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Stock status report for the South Australian giant crab (Pseudocarcinus gigas) fishery in 2019/20: fishery status report to PIRSA Fisheries and Aquaculture
SARDI Research Report Series - South Australian Research and Development Institute|2021. (1090):vi + 20 pp. 27 ref. ; 2021.
Article in English | CAB Abstracts | ID: covidwho-1824204
ABSTRACT
This report provides an assessment of the status of the South Australian Giant Crab Fishery (GCF) using data to the end of the 2019 fishing season that extends from 1 October 2019 to 31 May 2020. It analyses fishery-dependent data at a State-wide scale, collected from two management zones, the Northern Zone (NZ) and Southern Zone (SZ), and from three commercial fishing sectors (1) Miscellaneous Fishery sector;(2) South Australian Rock Lobster Fishery (SARLF) quota sector (RL-quota);and (3) SARLF by-product sector (RL by-product). Catches of Giant Crab in the last seven seasons are among the lowest recorded in the fishery since the Total Allowable Commercial Catch (TACC) was implemented in 1999. In 2019, the total catch in the GCF was 14.2 t. This was the lowest catch recorded since 1993, comprising 64.3% of the TACC of 22.1 t. The amount of targeted catch in the Miscellaneous Fishery sector and RL-quota sector in 2019 was also the lowest on record (13.7 t). The reductions in catch reported in 2019 likely reflect (1) reduced effort in the 2019 season associated with COVID-19 impacts on market demand;and (2) reduced catches in the SZ since 2005. Estimates of CPUE of legal-size Giant Crab have declined in South Australia since 2008, and although relatively stable in the last five seasons, are now the lowest on record. In addition, pre-recruit abundance, which has declined since 2004, is now the lowest on record and is likely to impact future harvestable biomass. The biological susceptibility of Giant Crab populations to recruitment overfishing combined with recent declining trends in catch, CPUE and pre-recruit abundance signal uncertainty in relation to the GCF's future performance. Determination of stock status in 2019 was aided by the implementation of recommendations made in SARDI's 2017 assessment of data sources and performance indicators (Pis) for the GCF, as well the management policy for the GCF developed in consultation with industry (PIRSA 2018). Within the management policy for the GCF, the status of the Giant Crab stock is defined in relation to how the primary biological PI, five-year average commercial CPUE of legal-size Giant Crab, aligns against its Trigger Reference Point (RPtrig) (PIRSA 2018). In 2019, the estimate of five-year commercial CPUE of legal-size Giant Crab was 2.09 kg/potlift. This estimate is the lowest on record but 7.2% above the RPtrig of 1.95 kg/potlift. Under the decision rule within the management policy to categorise the Giant Crab stock status in South Australia, the stock is classified as 'sustainable' in 2019 (PIRSA 2018).
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Collection: Databases of international organizations Database: CAB Abstracts Language: English Journal: SARDI Research Report Series - South Australian Research and Development Institute|2021. (1090):vi / 20 pp. 27 ref. Year: 2021 Document Type: Article

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Collection: Databases of international organizations Database: CAB Abstracts Language: English Journal: SARDI Research Report Series - South Australian Research and Development Institute|2021. (1090):vi / 20 pp. 27 ref. Year: 2021 Document Type: Article