Quantitative assessment of the Queensland saucer scallop (Amusium balloti) fishery

In recent years (2015 and 2016) there has been growing concern from members of the fishing industry and the Queensland Government over declining catches of legal-sized saucer scallop. This led to a request in mid-2016 by Fisheries Queensland, the fisheries management service within the Department of Agriculture and Fisheries, for an investigative analysis of the status of saucer scallops. The scope of the investigation was limited to a short time frame of three months to urgently analyse the most recent data and undertake a stock assessment. This report provides findings that support the concerns about low abundance of legal-sized scallops. Average catch rates from January 2015 to April 2016 were the lowest in the 39-year record. These recent average catch rates are slightly lower than those in 1996 when the scallop population size fell to low levels and emergency closed areas were implemented by the Government. From these data the model estimates of spawning stock in 2015 are potentially as low as 5-6% of 1977 levels, when the fishery was in its early development