8 September 2026
The Department of Agriculture and Fisheries has released a scientific stock assessment for the Northwest Northern Territory Grey Mackerel stock (Scomberomorus semifasciatus), confirming that the stock remains healthy and sustainable under current management arrangements, and providing confidence in the long-term future of one of the Territory’s key offshore fisheries.
The assessment estimates spawning stock biomass at 61% of unfished levels, above the 48% target reference point established under the Offshore Net and Line Fishery Harvest Strategy. These results also support maintaining the current Total Allowable Commercial Catch (TACC) of 404 tonnes.
The assessment, which includes data to December 2024, is the first Northern Territory Grey Mackerel assessment to use the internationally recognised Stock Synthesis (SS3) modelling platform, representing a significant advancement in fisheries science and stock assessment capability. The model combines biological, commercial, recreational and fishing effort data into a single integrated assessment, providing a more comprehensive understanding of stock health and sustainability.
Acting Senior Executive Director of Fisheries Phillipa Hunter said this provides strong evidence that current management arrangements are delivering positive outcomes for Grey Mackerel in Northern Territory waters.
“This assessment confirms the Northwest Northern Territory Grey Mackerel stock is being managed sustainably under the current arrangements,” Ms Hunter said.
“The stock is estimated to be at 61% of unfished spawning biomass, which is above our target reference point and provides confidence that management settings are supporting long-term stock health.
“Healthy fish stocks mean continued opportunities for commercial operators, while ensuring the resource remains available for future generations.”
Grey Mackerel is a target species of the Offshore Net and Line Fishery, a quota-managed fishery which has an estimated gross value of production of $7.5 million.
Ms Hunter added the adoption of the Stock Synthesis modelling framework aligns Northern Territory fisheries assessments with contemporary national and international standards.
“The adoption of Stock Synthesis gives managers and stakeholders greater confidence in the information used to make decisions about the fishery,” Ms Hunter said.
“Science-based fisheries management is essential to maintaining healthy fish stocks, supporting regional jobs and ensuring future generations can continue to enjoy the benefits of our fisheries resources.”
The assessment demonstrates the Northern Territory Government’s commitment to using best-practice science to support sustainable fisheries, healthy fish stocks and long-term fishing opportunities for Territorians.
The full stock assessment report is available at here
