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Bastard Trumpeter (2018)

Latridopsis forsteri

  • Bradley Moore (Institute for Marine and Antarctic Studies, University of Tasmania)
  • Corey Green (Victorian Fisheries Authority)
  • Amy Smoothey (Department of Primary Industries, New South Wales)
  • Klaas Hartmann (Institute for Marine and Antarctic Studies, University of Tasmania)
  • Mike Steer (South Australian Research and Development Institute)
  • Tim Emery (Australian Bureau of Agricultural and Resource Economics and Sciences)

You are currently viewing a report filtered by jurisdiction. View the full report.

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Summary

Stocks of Bastard Trumpeter in four jurisdictions from the central coast of NSW to VIC and SA are negligible, with fishing levels unlikely to have a negative impact on stock. In TAS waters it is classified as depleted.

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Stock Status Overview

Stock status determination
Jurisdiction Stock Fisheries Stock status Indicators
Tasmania Tasmania SF Depleted Catch, effort, CPUE
SF
Scalefish Fishery (TAS)
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Stock Structure

The stock structure of Bastard Trumpeter is presently undefined. Bastard Trumpeter are found on exposed reefs and sandy habitats from the central coast of New South Wales, through Victorian and Tasmanian waters, to eastern South Australia [Edgar 1997, Kuiter 1993]. Larval duration is unknown, although other Trumpeter species have larval durations of up to 60 days, suggesting the potential for some connectivity between jurisdictions. Juveniles tend to inhabit shallow coastal reefs until about 4–5 years of age (and approximately 500 mm long) before moving offshore into deeper water as they approach maturity, apparently remaining in that habitat for the remainder of their lives [Harries and Lake 1985, Murphy and Lyle 1999].

Recent information indicates that the stock is considered depleted in Tasmania with negligible catches in other Australian jurisdictions. With current understanding of Bastard Trumpeter population dynamics, it was not possible to reconcile these differences and determine a single stock status for the entire south eastern Australian stock. Management arrangements vary across jurisdictions (for example, size limits) and the fishing fleets in each jurisdiction consist of a small number of vessels with different characteristics, resulting in different patterns of exploitation.

Here, assessment of stock status is presented at the jurisdictional level—Commonwealth, New South Wales, Victoria, Tasmania and South Australia

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Stock Status

Tasmania

In Tasmania, Bastard Trumpeter are taken almost exclusively by gillnet, predominantly as by-product in the Banded Morwong Fishery. Both commercial and recreational fisheries for the species are based almost entirely on immature juveniles. Commercial catches declined steadily since the mid-1990s, when around 50 t were harvested, and have fluctuated around 8 t since 2009–10, with 6.4 t landed in 2016–17 [Moore et al. 2018]. Catches and effort have contracted spatially in recent years, being concentrated primarily around the southeast and southwest coasts of the State [Moore et al. 2018]. Commercial gillnet effort has followed a similar downward trend to that observed for catches since the mid-1990s, while catch rates have remained relatively stable since the mid-2000s at a reduced level [Moore et al. 2018]. Bastard Trumpeter are a popular target for recreational fishers, although the estimated catch in 2012–13 was also a historic low of 7.5 t [Lyle et al. 2014]. Several recent management interventions have been made in recent years to rebuild stocks, including increases in the minimum legal size, introduction of commercial trip limits and reductions in recreational bag and possession limits.

As Bastard Trumpeter is a byproduct species in the commercial fishery, catch rather than catch rate may be a better indicator of biomass of the species. Consequently, the trend in commercial and recreational catches suggests that current inshore populations are at historically low levels. Given that fishing practices are likely to have remained fairly consistent in recent years, the decline in catches and low, stable catch rate are likely to be indicative of a population that has not substantially rebuilt despite significant management intervention and reductions in both commercial and recreational gillnet effort. Moreover, the current minimum size limit of 380 mm TL is well below the size at maturity [> 450 mm FL, Murphy and Lyle 1999]. The above evidence indicates that the biomass of this stock is likely to be depleted and that recruitment is likely to be impaired. Furthermore, the above evidence indicates that the current level of fishing mortality is likely to cause the stock to become recruitment impaired.

On the basis of the evidence provided above, Bastard Trumpeter in Tasmania is classified as a depleted stock.

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Biology

Bastard Trumpeter biology [Murphy and Lyle 1999]

Biology
Species Longevity / Maximum Size Maturity (50 per cent)
Bastard Trumpeter 20 years, 650 mm TL Unknown (matures at > 450 mm TL and > 4 years)
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Distributions

Distribution of reported commercial catch of Bastard Trumpeter

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Tables

Fishing methods
Tasmania
Commercial
Gillnet
Unspecified
Indigenous
Spearfishing
Gillnet
Recreational
Spearfishing
Gillnet
Management methods
Method Tasmania
Commercial
Area restrictions
Gear restrictions
Limited entry
Size limit
Trip limits
Indigenous
Bag and possession limits
Bag limits
Size limit
Recreational
Bag and possession limits
Bag limits
Licence
Size limit
Active vessels
Tasmania
46 in SF
SF
Scalefish Fishery (TAS)
Catch
Tasmania
Commercial 6.39t in SF
Indigenous Unknown
Recreational 7.5 t (in 2012/13)
SF
Scalefish Fishery (TAS)

Tasmania – Commercial (catch) (a) Catches reported for the Tasmanian Scalefish Fishery are for the period 1 July to 30 June the following year. The most recent assessment available is for 2016–17; (b) A trip limit of 200 kg is in place for commercial scalefish licence holder; and (c) A trip limit of 30 fish is in place for commercial rock lobster licence holders.

Tasmania – Recreational (management methods) In Tasmania, a recreational licence is required for fishers using dropline or longline gear, along with nets, such as gillnet or beach seine. The species is subject to a minimum size limit of 380 mm total length. A bag limit of five fish and a possession limit of ten fish is in place for recreational fishers.

Tasmania – Indigenous (management methods) In Tasmania, Indigenous persons engaged in aboriginal fishing activities in marine waters are exempt from holding recreational fishing licences, but must comply with all other fisheries rules as if they were licensed. Additionally, recreational bag and possession limits also apply. If using pots, rings, set lines or gillnets, Indigenous persons must obtain a unique identifying code (UIC). The policy document Recognition of Aboriginal Fishing Activities for issuing a UIC to a person for Aboriginal Fishing activity explains the steps to take in making an application for a UIC.

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Catch Chart

Commercial catch of Bastard Trumpeter - note confidential catch not shown

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References

  1. Edgar, G 1997, Australian Marine Life: the plants and animals of temperate waters. Reed Books, Melbourne.
  2. Harries, DN and Lake, PS 1985, Aspects of the biology of inshore populations of Bastard Trumpeter, Latridopsis forsteri (Castleneau, 1872) in Tasmanian waters. Tasmanian Fisheries Research, 27: 19–43.
  3. Kuiter, RH 1993, Coastal Fishes of South-Eastern Australia. Crawford House Press,
  4. Lyle, JM, Stark, KE and Tracey SM 2014, 2012–13 survey of recreational fishing in Tasmania. Institute for Marine and Antarctic Studies, Hobart.
  5. Moore, B, Lyle J and Hartmann K 2018, Tasmanian Scalefish Fishery Assessment 2016/17. Institute for Marine and Antarctic Studies, University of Tasmania.
  6. Murphy, RJ and Lyle, JM 1999. Impact of gillnet fishing on inshore temperate reef fishes, with particular reference to Banded Morwong, Tasmanian Aquaculture and Fisheries Institute, Hobart.