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Wavy Periwinkle (2018)

Lunella undulata

  • John Keane (Institute for Marine and Antarctic Studies, University of Tasmania)
  • Corey Green (Victorian Fisheries Authority)
  • Greg Ferguson (South Australian Research and Development Institute)
  • Klaas Hartmann (Institute for Marine and Antarctic Studies, University of Tasmania)
  • Rowan Chick (Department of Primary Industries, New South Wales)

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

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Summary

The Wavy Periwinkle is a moderate-sized marine shellfish found in shallow temperate waters of southern Australia. Stock status is sustainable in TAS and SA and negligible in NSW and VIC.

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Stock Status Overview

Stock status determination
Jurisdiction Stock Fisheries Stock status Indicators
Tasmania Tasmania TBC Sustainable Catch rates, size structure
TBC
Periwinkle Fishery (TAS)
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Stock Structure

The Wavy Periwinkle, Lunella undulata, is a moderately sized marine gastropod found on exposed sand-scoured reef and boulder habitat in shallow temperate waters (0–20 m) of southern Australia. They grow to a maximum length of around 65 mm and are distributed from Hopetoun, Western Australia to Coolangatta, Queensland, and around Tasmania [Edgar 2012]. Wavy Periwinkles form large aggregations in shallow coastal waters. The Wavy Periwinkle has a protracted spawning period from October to May, and may undergo incomplete spawning (retain unshed eggs until the next spawning event) [Keane et al. 2014, Underwood 1974]. They have short-term lecithotrophic larvae (planktonic larvae which live off the yolk supplied by the egg), and it is assumed that the larval duration is about five days, similar to other species within the taxon [Underwood 1974]. Stock structure is unknown, however a study into genetic diversity across southern Australia is underway.

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

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Stock Status

Tasmania

The harvest strategy for Wavy Periwinkles in Tasmania in the Commercial Dive Fishery policy document [DPIPWE 2005, 2011] uses catch rates and size structure as performance indicators for the fishery. Trigger points for catch rates are reached if there is a decline of 20 per cent in each of two consecutive years or 35 per cent in a year. The fishery is managed by both input and output controls including limited entry, a total allowable commercial catch of 52.8 tonnes (t) split into five zones and a 45 mm size limit which allows populations to spawn twice before entering the fishery [Keane et al. 2014].

Catches in the fishery since the introduction of a management plan in 2005 have varied between 13.0 t in 2009–10 to 41.0 t in 2014–15. The 2016–17 catch was 38.5 t. Catch rates have averaged 66.1 kg per hr since 2009 when the size limit increased from 30 to 40 mm, and have not varied any more than 18 per cent from this mean. A size limit increase in 2014 to 45 mm saw no impact on catch rates. Catch rates in the 2016–17 season averaged 68.4 kg per hr.

The above evidence indicates that the biomass of this stock is unlikely to be depleted and that recruitment is unlikely to be impaired. Furthermore, the above evidence indicates that the current level of fishing mortality is unlikely to cause the stock to become recruitment impaired.

On the basis of the evidence provided above (robust size limit and stable catch rates), the Tasmanian Periwinkle stock is classified as a sustainable stock

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Biology

Wavy Periwinkle biology [Keane et al. 2014]

Biology
Species Longevity / Maximum Size Maturity (50 per cent)
Wavy Periwinkle ~ 10 years, 65 mm TL 23–26 mm TL
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Distributions

Distribution of reported commercial catch of Wavy Periwinkle
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Tables

Fishing methods
Tasmania
Commercial
Diving
Unspecified
Recreational
Hand collection
Management methods
Method Tasmania
Commercial
Gear restrictions
Limited entry
Marine park closures
Size limit
Spatial closures
Spatial zoning
Total allowable catch
Recreational
Bag limits
Gear restrictions
Marine park closures
Catch
Tasmania
Commercial 38.52t in TBC
Indigenous Unknown
Recreational Unknown
TBC
Periwinkle Fishery (TAS)
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Catch Chart

Commercial catch of Wavy Periwinkle - note confidential catch not shown
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References