Date Published: June 2021
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Luderick is a sustainable species which inhabits shallow coastal and estuarine waters. It occurs from southern Queensland to northern Tasmania and across to South Australia.
Stock Status Overview
Catch, effort, fishing mortality, size composition
Luderick inhabit shallow coastal and estuarine waters from southern Queensland to northern Tasmania and across to South Australia [Gray and Miskiewicz 2000, Smith and Sinerchia 2004, Gray et al. 2012, Ferguson et al. 2013]. While the biological stock structure of Luderick remains unknown, tagging studies indicate some adults move considerable distances along the eastern Australian coastline, and across the jurisdictional boundary between New South Wales and southern Queensland [Gray et al. 2012]. Limited genetic data support the existence of a single eastern Australia biological stock [Curley et al. 2013].
Here, assessment of stock status is presented at the biological stock level—Eastern Australia.
Because this cross-jurisdictional stock is fished in Queensland, New South Wales, Victoria and Tasmania, each jurisdiction assesses that part of the biological stock that occurs in its waters. The status presented here for the entire biological stock has been established using evidence from all four jurisdictions.
In Queensland, Luderick are predominantly taken by the inshore commercial gillnet (or ‘mesh net’) fishery in the south, and at their northern distributional limit [Halliday et al. 2001]. In 2019, the commercial harvest was 4 tonnes (t) and substantially less than an annual average of 12.5 t during 2009–18, although catches are known to have been greater in the past. Historical population declines as a result of warming temperatures are possible in southern Queensland [Pollock, 2017], but commercial harvests and effort have also reduced since 2017 [QFISH 2020]. Recent estimates of the recreational harvest of Luderick in Queensland are unreliable, because only one household reported catching the species during a 2013–14 survey [Webley et al. 2015]. A minimum legal size, set at 300 mm total length (TL), close to the size at first maturity [Pollock 1981, Gray et al. 2012, Curley et al. 2013] applies to Luderick, which protects a portion of the spawning stock. A recreational possession limit of 10 restricts fishing pressure [Campbell 2013]. While there are no current concerns for Luderick in Queensland, there is insufficient information available to confidently classify the biomass or the level of fishing pressure for this part of the stock.
In New South Wales, the main commercial fishery for Luderick occurs in estuaries (mostly using mesh nets but also haul seines) and, to a lesser extent, inshore ocean waters (haul seines) [Gray 2002, 2005a, 2005b, Broadhurst et al. 2003, Gray and Kennelly 2003]. Commercial landings reached a peak of nearly 800 t in 1989 but then declined with a reduction in effort to less than 400 t in 2004. Over the subsequent decade, annual landings varied considerably between 290 and 450 t [Hall 2015], but decreased to 265 t in 2016 and have remained fairly stable to 2019 (268 t). The last reductions in annual catches follow declining effort and a fairly consistent nominal catch rate by haul seiners, although the nominal catch rate for mesh netting (the most common harvest method) has slightly increased in the past two years. The most recent estimate of the recreational harvest of Luderick in New South Wales was ~50 000 fish or 30 t during 2017–18 [Murphy et al. 2020]. This estimate was based on a survey of recreational fishing licence (RFL) households, which comprised at least one person with a long-term (one or three year) fishing licence, but also included other fishers within the household. A similar survey of RFL households was done in 2013–14 during which 108 000 Luderick were recreationally harvested, but with greater perceived effort (reflecting the larger catches during this period).
Formal fishing mortality estimates from the late 1990s (prior to the reduction in fishing effort in New South Wales) varied considerably between estuaries, but in more than 50 per cent of cases were historically equal to, or less than, natural mortality [Gray et al. 2010]. Fishing mortality across all ages classes of Luderick in NSW is expected to have decreased over the past decade due to substantial reductions in total commercial fishing effort. For juvenile Luderick, fishing mortality has likely been further decreased by improved selectivity for both mesh nets [Broadhurst et al. 2003, Gray et al. 2005a] and haul seines [Broadhurst et al. 2007]. Recent size-at-age data imply differences in year-class strength between estuaries, but collectively older ages were well represented. A minimum legal length (MLL) of 270 mm TL, spatial closures and bag limits for recreational fishers (10 per day or 20 in possession) in New South Wales minimise fishing pressure on the spawning stock, and studies imply Luderick is among the most resilient of estuarine teleosts to being caught, handled and released. Specifically, Butcher et al.  observed 99 per cent short-term survival among all sizes of Luderick when released by hook-and-line, while Broadhurst et al.  recorded 83 per cent survival among mesh-netted-and-discarded juveniles. Collectively, the above evidence indicates that the current level of fishing pressure is unlikely to cause this part of the stock to become recruitment impaired.
In Victorian waters, Luderick are commercially harvested from the Gippsland Lakes Fishery and mainly caught using mesh nets, although a small proportion of catch is attributed to haul seines [Ramm 1983, Kemp et al. 2011, Victorian Bays and Inlets Fisheries Association 2013]. Since 2000, the greatest catches were observed in 2007 (41.5 t); however, catches have since declined to approximately 2 t in 2017 and 2.7 t in 2019. Catch rates have declined continually since the most recent peak in 2007–08 [Conron et al. 2016]. The annual and recent five-year average catch rates to 2014–15 were ~60 and 20 per cent below the long-term average, respectively [Conron et al. 2016]. However, because Luderick are generally taken as bycatch when fishers are targeting Black Bream, the catch rate may not provide a reliable index of abundance. The uncertainty regarding interpretation of catch-rate trends makes it difficult to know whether recent fishing pressure has impacted the spawning stock biomass within the Gippsland Lakes Fishery. Fishing pressure is limited by a minimum legal length of 230 mm TL for both commercial and recreational fishers, and a daily bag limit of 10 fish for recreational fishers. At the end of March 2020, the fishery was closed following a buy-out of all commercial netting licences, implemented to improve recreational fishing access by hook and line methods. Removing commercial licences is a key part of the Gippsland Lakes Recovery Plan, which also includes strategies for fish re-stocking and cross-agency habitat improvement (VFA 2020). Harvesting within the Gippsland Lakes is unlikely to impact the overall biological stock, but there is insufficient information available to confidently classify the biomass or the level of fishing pressure for this part of the stock.
In Tasmanian waters, Luderick is a by-product species of the multi-gear, multi-species Tasmanian Scalefish Fishery, predominately caught using mesh nets and hand lines. Commercial catches have been minimal, with an average catch of 0.36 t recorded since 1995–96 (maximum recorded catch was 1.5 t in 1995–96). The total recorded commercial catch in 2018–19 was 105 kg [Krueck et al. 2020]. Reductions in commercial effort for Luderick reflect a general fishery-wide decline in effort. Estimated recreational catches from hand lines and mesh nets are also minimal [Lyle and Tracey 2012, Lyle et al. 2014]. Given the negligible commercial and recreational catches in Tasmania, the biomass of this stock is unlikely to be depleted and recruitment is unlikely to be impaired. Further, the current level of fishing mortality is unlikely to cause the stock to become recruitment impaired.
The evidence presented above indicates that for three parts of the stock (Queensland, Victoria and Tasmania), the status is undefined. However, only small catches and low effort are reported from these jurisdictions, and these are unlikely to have a significant impact on the overall biological stock. For the central part of the stock in New South Wales, where the bulk of commercial and recreational catches are taken (i.e. >97% of the total), the above evidence indicates that the biomass of this stock is unlikely to be recruitment overfished and the current level of fishing pressure is unlikely to cause the stock to become recruitment overfished.
On the basis of the evidence provided above, the Eastern Australia biological stock is classified as a sustainable stock.
Luderick biology [Pollock 1981, Gray et al. 2010, 2012]
|Species||Longevity / Maximum Size||Maturity (50 per cent)|
|Luderick||24 years, 560 mm TL||4–4.5 years, 280–300 mm FL|
Distribution of reported commercial catch of Luderick
|Hook and Line|
|Hook and Line|
|Recreational||< 0.5 t (2010)|
Queensland – Indigenous (management methods) for more information see https://www.daf.qld.gov.au/business-priorities/fisheries/traditional-fishing
New South Wales – Recreational (catch) Murphy et al. .
New South Wales – https://www.dpi.nsw.gov.au/fishing/aboriginal-fishing.
Victoria – Indigenous (Management Methods) A person who identifies as Aboriginal or Torres Strait Islander is exempt from the need to obtain a Victorian recreational fishing licence, provided they comply with all other rules that apply to recreational fishers, including rules on equipment, catch limits, size limits and restricted areas. Traditional (non-commercial) fishing activities that are carried out by members of a traditional owner group entity under an agreement pursuant to Victoria’s Traditional Owner Settlement Act 2010 are also exempt from the need to hold a recreational fishing licence, subject to any conditions outlined in the agreement. Native title holders are also exempt from the need to obtain a recreational fishing licence under the provisions of the Commonwealth’s Native Title Act 1993.
Tasmania – Recreational (Management Methods) In Tasmania, a recreational licence is required for fishers using dropline or longline gear, along with nets, such as mesh net or beach seine.
Tasmania – Indigenous (Management Methods) In Tasmania, Indigenous persons engaged in traditional 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. For details, see the policy document "Recognition of Aboriginal Fishing Activities” (https://dpipwe.tas.gov.au/Documents/Policy%20for%20Aboriginal%20tags%20and%20alloting%20an%20UIC.pdf).
- Broadhurst, MK, Gray, CA, Young, DJ and Johnson, DD 2003, Relative efficiency and size selectivity of bottom-set gillnets for dusky flathead Platycephalus fuscus, and other species in New South Wales, Australia, Archive of Fishery and Marine Research, 50: 289–302.
- Broadhurst, MK, Millar, RB and Brand, CP 2009, Mitigating discard mortality from dusky flathead Platycephalus fuscus gillnets, Diseases of Aquatic Organisms, 85: 157–166.
- Broadhurst, MK, Wooden, MEL, Millar, RB 2007, Isolating selection mechanisms in beach seines, Fisheries Research, 88: 56–69.
- Butcher, PA, Broadhurst, MK, Hall, KC and Cooke, SJ 2011, Post-release survival and physiology of angled luderick (Girella tricuspidata) after confinement in keeper nets in an Australian estuary, ICES Journal of Marine Science, 68: 572–579.
- Campbell, M 2013, Reducing the impact of discarded recreational fishing tackle on coastal seabirds, Fisheries Research and Development Corporation project 2011/057, Queensland Department of Agriculture Fisheries and Forestry, Brisbane.
- Conron, S, Giri K, Hamer, P and Hall, K 2016, Gippsland Lakes Fishery Assessment 2016, Fisheries Victoria Science Report Series No. 14.
- Curley, BG, Jordan, AR, Figueira, WF and Valenzuela, VC 2013, A review of the biology and ecology of key fishes targeted by coastal fisheries in south-east Australia: identifying critical knowledge gaps required to improve spatial management, Reviews in Fish Biology and Fisheries, 23: 435–458.
- Ferguson, AM, Harvey, ES, Taylor MD and Knott NA 2013, A herbivore knows its patch: luderick, Girella tricuspidata, exhibit strong site fidelity on shallow subtidal reefs in a temperate marine park, PLoS One, 8: e65838.
- Gray, C, Haddy, J, Fearman, J, Barnes, L, Macbeth, W and Kendall, B 2012, Reproduction, growth and connectivity among populations of Girella tricuspidata (Pisces: Girellidae), Aquatic Biology, 16: 53–68.
- Gray, CA 2002, Management implications of discarding in an estuarine multi-species gill net fishery, Fisheries Research, 56: 177–192.
- Gray, CA and Kennelly, SJ 2003, Catch characteristics of the commercial beach-seine fisheries in two Australian barrier estuaries, Fisheries Research, 63: 405–422.
- Gray, CA and Miskiewicz, AG 2000, Larval fish assemblages in south-east Australian coastal waters: seasonal and spatial structure, Estuarine, Coastal and Shelf Science, 50: 549–570.
- Gray, CA, Broadhurst, MK, Johnson, DD and Young, DJ 2005, Influences of hanging ratio, fishing height, twine diameter and material of bottom‐set gillnets on catches of dusky flathead Platycephalus fuscus and non‐target species in New South Wales, Australia, Fisheries Science, 71: 1217–1228.
- Gray, CA, Ives, MC, Macbeth, WG and Kendall, BW 2010, Variation in growth, mortality, length and age compositions of harvested populations of the herbivorous fish Girella tricuspidata, Journal of Fish Biology, 76: 880–899.
- Gray, CA, Johnson, DD, Broadhurst, MK and Young, D 2005, Seasonal, spatial and gear-related influences on relationships between retained and discarded catches in a multi-species gillnet fishery, Fisheries Research, 75: 56–72.
- Hall, KC 2015, Luderick (Girella tricuspidata), in J Stewart, A Hegarty, C Young, AM Fowler and J Craig (eds), Status of fisheries resources in NSW 2013–14, NSW Department of Primary Industries, Mosman, pp 199–202.
- Halliday, IA, Ley, JA, Tobin, A, Garrett, R, Gribble, NA and Mayer, DG 2001, The effects of net fishing: addressing biodiversity and bycatch issues in Queensland inshore waters, Fisheries Research and Development Corporation project 97/206, Department of Primary Industries, Queensland.
- Kemp, J, Bruce, T, Conron, S, Bridge, N, MacDonald, M and Brown, L 2013, Gippsland Lakes (non-bream) Fishery Assessment 2011, Fisheries Victoria Assessment Report Series No 67, ISSN 1329-7287.
- Krueck N, Hartmann, K and Lyle J 2020, Tasmanian Scalefish Fishery Assessment 2018/19. Institute for Marine and Antarctic Studies, University of Tasmania.
- Lyle, JM and Tracey, SR 2012, Recreational gillnetting in Tasmania – an evaluation of fishing practices and catch and effort, Institute for Marine and Antarctic Studies, University of Tasmania, Hobart
- Lyle, JM, Stark, KE and Tracey, SR 2014, 2012-2013 survey of recreational fishing in Tasmania. Institute for marine and Antarctic Studies, University of Tasmania, Hobart.
- Murphy, JJ, Ochwada-Doyle, FA, West, LD, Stark, KE and Hughes, JM 2020, The NSW Recreational Fisheries Monitoring Program - survey of recreational fishing, 2017/18. NSW DPI - Fisheries Final Report Series No. 158.
- Pollock, BR 1981, Age determination and growth of luderick, Girella tricuspidata (Quoy and Gaimard), taken from Moreton Bay, Australia, Journal of Fish Biology, 19: 475–485.
- Pollock, BR 2017, Latitudinal change in the distribution of luderick Girella tricuspidata (Pisces: Girellidae) associated with increasing coastal water temperature in eastern Australia, Marine and Freshwater Research, 68: 1187–1192.
- QFish, Department of Agriculture and Fisheries, www.qfish.gov.au
- Ramm, D 1983, An ecological survey of postlarval and juvenile fish in the Gippsland Lakes (Victoria), Gippsland Regional Environmental Study Ministry for Conservation, Victoria.
- Smith, KA and Sinerchia, M 2004, Timing of recruitment events, residence periods and post-settlement growth of juvenile fish in a seagrass nursery area, south-eastern Australia, Environmental Biology of Fishes, 71: 73–84.
- Victorian Bays and Inlets Fisheries Association 2013, Environmental Management System, Victorian Bays and Inlets Fisheries Association, Victoria.
- Victorian Fisheries Authority (VFA), June 2020. Gippsland Lakes Recreational Fishery Plan 2020. 20 pp.
- Webley, J, McInnes, K, Teixeira, D, Lawson, A and Quinn, R 2015, Statewide Recreational Fishing Survey 2013–14, Queensland Department of Agriculture and Fisheries, Brisbane.
- West, LD, Stark, KE, Murphy, JJ, Lyle, JM and Doyle FA 2015, Survey of recreational fishing in New South Wales and the ACT, 2013/14, Fisheries Final Report Series.