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Moreton Bay Bug

Moreton Bay Bug

Latin names: Thenus australiensis, T. parindicus

Common Names: Bug

Wild Caught - Australia

Moreton Bay Bug location

Region Caught:

  • QLD East Coast Otter Trawl Fishery (537t in 2016)

This assessment is based on the current impact of fishing for Moreton Bay bugs in QLD-managed fisheries. A reform of QLD fisheries is currently underway in order to modernise the management framework, demonstrate sustainability, improve the profitability of the industry and meet community expectations. AMCS will review the sustainability of the fishery following the fishery reform process.

The term 'Moreton Bay bugs' refers to two species, the reef and mud bug, both found throughout subtropical and tropical waters around Australia. Bugs are caught in trawl fisheries that mainly target prawns. The stock structure of either species of bug is poorly understood and no stock assessments have taken place. The retention of ‘berried’ or egg-bearing females is allowed, which has been prohibited in other fisheries to protect the stock. While management measures do not appear robust enough to protect the stocks of bugs, Great Barrier Reef Marine Park closures are estimated to protect around half of the stock of both species, and there is no evidence of concerning declines in stocks from the available information.

In QLD, Moreton Bay bugs are caught in a trawl fishery that targets multiple species of prawns, scallops and fish. The majority of the catch is from within the Great Barrier Reef Marine Park.

Bycatch reduction devices (BRD) and Turtle Exclusion Devices (TEDs) reduce the amount of threatened and other species that are caught and killed in fishing gear. They are mandatory in this fishery and it is believed they have been successful in reducing turtle deaths. However, threatened species bycatch, including of turtles, sea snakes, sawfish and seahorses, remains an ongoing issue.

Trawl fisheries generally catch a high number of species other than that targeted, which can result in a high volume of discarding of unwanted catch. Discarded catch is not required to be reported in QLD, meaning there is no information on the impact of the fishery on marine animals that have no commercial value.

Independent fishery observer programs are an important method of verifying protected species interactions, as well as other fishery impacts, such as the type and volume of discarded catch. Unfortunately the QLD Government has closed the observer program for all QLD-managed fisheries in 2012. In the intervening six years, there has been no independent on-vessel monitoring of the impact of the fishery, which is unacceptable for fisheries operating in the ecologically sensitive regions of the Great Barrier Reef. Concerns have been raised regarding under-reporting of endangered species caught in the fishery in logbooks. Since there is no reliable record of actual protected species interactions over time, the ecological impacts of this fishery cannot be measured or managed.

Trawling occurs over sandy and muddy sea floors within the Great Barrier Reef and Moreton Bay Marine Parks, where habitats are relatively well understood, as well as to the south of the marine park. Zoning closes 66% of the Great Barrier Reef and 44% of the Moreton Bay marine park to trawl fishing, protecting a significant proportion of marine habitat. Assessments of the impact of fishing to marine habitats showed that trawling presents a relatively low risk of long-term or significant damage to habitats within the marine park. In addition, all boats operating in the fishery have location monitoring devices, which means authorities can ensure fishing is only taking place in areas open to fishing.

QLD fisheries are currently undergoing broad reforms that have a strong potential to improve this ranking in the future, provided that the reforms deliver the strong and effective management necessary to support sustainable fisheries.


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Moreton Bay Bug classification

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