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Pale Octopus (2020)

Octopus pallidus

  • Nils Krueck (Institute for Marine and Antarctic Studies, University of Tasmania)
  • Victorian Fisheries Authority (Victorian Fisheries Authority)
  • Paul Rogers (SARDI Aquatic Sciences, South Australia)
  • Nicholas Hill (Institute for Marine and Antarctic Studies, University of Tasmania)
  • Karina Hall (Department of Primary Industries, New South Wales)

Date Published: June 2021

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Summary

Pale Octopus is distributed from the Great Australian Bight around TAS to southern NSW. Stocks are classified as depleting in Tasmania, negligible in NSW and SA, and undefined in VIC.

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Stock Status Overview

Stock status determination
Jurisdiction Stock Stock status Indicators
Tasmania Tasmania Depleting

Catch, effort, CPUE, potlift surveys

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Stock Structure

Pale Octopus is distributed from the Great Australian Bight around Tasmania to southern New South Wales. There is evidence to suggest that Pale Octopus shows complex biological stock structure, with a number of discrete subpopulations in Bass Strait (less than 100 km apart) due to limited dispersal and isolation by distance [Doubleday et al. 2008, Higgins et al. 2013]. However, further information is required to confirm the overall stock structure across southern Australia. Here, assessments of stock status are presented at the jurisdictional level—New South Wales, Victoria, Tasmania and South Australia.

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Stock Status

Tasmania

In Tasmania, the stock status of Pale Octopus is assessed using data on commercial catch and catch per unit effort (CPUE; i.e. octopus per pot-lift). A 50-pot sampling program has been conducted in the fishery since November 2004, whereby fishers are required to collect data on the number and sex of all octopuses caught in 50 randomly selected pots from a single line per fishing day, resulting in data from approximately 4 000 pot lifts per fishing season.

Catch of Pale Octopus in the Tasmanian Octopus Fishery (TOF) has fluctuated around 60–100 t since 2005–06, reaching an initial peak of approximately 126 t in 2012–13. Catches of Pale Octopus were reduced to <100 t again in the following seasons before reaching a new peak of approximately 132 t in the 2018–19 season. In 2019–20, catch remained at a similarly high level (120 t), representing the first two consecutive seasons with catches > 100 t. Fishing effort has fluctuated around 300 000 pot-lifts since 2006–07 before reaching a historic high of 448 000 pot-lifts in 2012–13 and then declining again to comparable levels fluctuating around 300 000 pot lifts over the last five fishing seasons [Krueck et al. 2021].

Standardised CPUE in the TOF, calculated using a general linear model based on total commercial catch and data from the 50-pot sampling program, has fluctuated between roughly 50 and 90 per cent compared to the reference year (2004–05) since 2011–12 [Krueck et al. 2021]. In stock assessments up until 2018–19, these fishery-wide trends in catch, effort and CPUE were used as primary indicators of stock status [Hill et al. 2020]. However, recent the recent redistribution of fishing effort and catch to areas further offshore initiated more in-depth analyses of local trends in catch, effort and CPUE for the 2019–20 assessment. The results highlighted that some key traditionally fished areas are still productive, but that declining trends in CPUE are widespread and potentially concerning. CMSY simulations, which were run for a spatially consistent time series of catch data that excluded more recently exploited areas east of King Island, supported these concerns by indicating biomass depletion from 2006–07 onwards down to 30–31% (lower 90% confidence limit of 18–23%) of unfished levels in 2019–20 [Krueck et al. 2021].

In further consideration of the high-risk nature of the fishery, which was formally assessed in 2019–20 [Krueck et al 2021], evidence of localised and total biomass depletion in traditionally fished areas indicates that current levels of fishing are unlikely to be sustainable. On the basis of this evidence, the Pale Octopus stock in northern Tasmania is classified as a depleting stock. 

 

 

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Biology

Pale Octopus biology [Leporati et al. 2007, Leporati et al 2008a, Leporati et al 2008b]

Biology
Species Longevity / Maximum Size Maturity (50 per cent)
Pale Octopus 1.5 years, 1200 g Females 473 g, Males < 250 g
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Distributions

Distribution of reported commercial catch of Pale Octopus
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Tables

Fishing methods
Tasmania
Commercial
Pots and Traps
Indigenous
Spearfishing
Hand collection
Coastal, Estuary and River Set Nets
Rock Lobster And Crayfish Traps And Pots
Recreational
Spearfishing
Hand collection
Coastal, Estuary and River Set Nets
Rock Lobster And Crayfish Traps And Pots
Management methods
Method Tasmania
Commercial
Gear restrictions
Limited entry
Indigenous
Bag and possession limits
Bag limits
Recreational
Bag and possession limits
Bag limits
Catch
Tasmania
Commercial 132.20t
Indigenous Unknown
Recreational 1 143 unspecified octopus landed in 2012–13

Victoria – Commercial (catch) Pale Octopus is not differentiated from other octopuses caught in Victorian commercial fisheries.

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 – Commercial (catch) Catches reported for the Tasmanian Octopus Fishery are for the period 1 March to end of February the following year. The most recent assessment available is for 2018/19.

Tasmania – Commercial (management methods) A general possession limit of 100 kg of octopus per day (all species combined) is in place for holders of a fishing licence (personal) and a scalefish licence. This limit does not apply to Tasmanian Octopus Fishery licence holders operating in northern Tasmania.

Tasmania – Recreational (management methods) In Tasmania, a recreational licence is required for fishers using rock lobster pots, along with nets, such as gillnet or beach seine. A bag limit of five octopus and a possession limit of ten octopus (all species combined) is in place for recreational fishers.

Tasmania – Indigenous 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).

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Catch Chart

Commercial catch of Pale Octopus - note confidential catch not shown
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References

  1. Conron, SD, Bell, JD, Ingram, BA and Gorfine, HK 2020, Review of key Victorian fish stocks — 2019, Victorian Fisheries Authority Science Report Series No. 15, First Edition, November 2020. VFA: Queenscliff. 176pp.
  2. Doubleday, ZA, Pecl, GT, Semmens, JM and Danyushevsky, L 2008, Stylet elemental signatures indicate population structure in a holobenthic octopus species, Octopus pallidus, Marine Ecology Progress Series, 371: 1–10.
  3. Hall, KC 2015, Octopus (Octopus spp.), in Stewart, J, Hegarty, A, Young, C, Fowler, AM and Craig, J (ed.s), Status of fisheries resources in NSW 2013–14, NSW Department of Primary Industries, Mosman, pp 231–234.
  4. Hall, KC 2018, NSW stock status summary 2018 - Octopuses (Octopus australis, Macroctopus maorum, O. tetricus and O. pallidus), NSW Department of Primary Industries, Coffs Harbour, NSW
  5. Higgins, KL, Semmens, JM, Doubleday, ZA and Burridge, CP 2013, Comparison of population structuring in sympatric octopus species with and without a pelagic larval stage, Marine Ecology Progress Series, 486: 203–212.
  6. Hill, N, Krueck, N and Hartmann, K 2020, Tasmanian Octopus Fishery Assessment 2018/19, Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Tasmania.
  7. Krueck, N, Hill, N, Hartmann, K, and Fraser, K 2021, Tasmanian Octopus Fishery Assessment 2019/20, Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Tasmania.
  8. Leporati, SC, Pecl, GT and Semmens, JM 2007, Cephalopod hatchling growth: The effects of initial size and seasonal temperatures, Marine Biology, 151: 1375–1383.
  9. Leporati, SC, Pecl, GT and Semmens, JM 2008a, Reproductive status of Octopus pallidus, and its relationship to age and size, Marine Biology, 155: 375–385.
  10. Leporati, SC, Semmens, JM and Pecl, GT 2008b, Determining the age and growth of wild octopus using stylet increment analysis, Marine Ecology Progress Series, 367: 213–222.

Downloadable reports

Click the links below to view reports from other years for this fish.