Enhancing fishery assessments for an Australian abalone fishery using commercial weight-grade data

Mayfield, Stephen

doi:10.1016/j.fishres.2010.02.007

Cited by 7 publications

(9 citation statements)

References 36 publications

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“…Our relatively crude estimates of daily profitability showed a sizeable 62% decrease and it is possible that divers shifted their effort in a bid to find better quality abalone (see Jalali et al., ), but if this was the case then it was not reflected in the prices reported by the local processing factory. The much lower prices which were paid for greenlip abalone from the study area are contrary to expectations for this species (Mayfield, ; Stobart et al., ) which at a premium grade is fetching beach prices of $40–50/kg when destined for the live export markets of Asia (pers. comm.…”

Section: Discussioncontrasting

confidence: 63%

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Modelling trends including effects of natural disturbance in an abalone dive fishery in Australia

Gorfine

Thomson

Spring

et al. 2018

Natural Resource Modeling

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Section: Discussioncontrasting

confidence: 63%

“…The use of blacklip abalone parameters was due to an absence of morphometric data for greenlip abalone in Victoria. Shucked weight was estimated by assuming a meat recovery rate of one third of whole weight (see Mayfield, ).…”

Section: Methodsmentioning

confidence: 99%

Modelling trends including effects of natural disturbance in an abalone dive fishery in Australia

Gorfine

Thomson

Spring

et al. 2018

Natural Resource Modeling

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“…Initial surveys utilized the "timed-swim" method (Shepherd, 1984), but have subsequently been replaced by the "leaded-line" method, following rigorous development and testing (McGarvey et al, 2008;Chick et al, 2012). Third, extensive biological (e.g., Shepherd, 1973;Shepherd et al, 1992;Shepherd and Partington, 1995;Mayfield and Saunders, 2008) and irregular commercial-catch-sampling data (Burch et al, 2010) have been collected for both species, and greenlip weight-grade data have been consistently recorded by western zone processors since 1979 (Mayfield, 2010). Collectively, these data provide information on exploitation rates and the suitability of size limits across the three zones.…”

Section: Samentioning

confidence: 99%

Fifty Years of Sustained Production from the Australian Abalone Fisheries

Mayfield

Mundy

Gorfine³

et al. 2012

Reviews in Fisheries Science

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The sustained production of abalone from the five state-managed (Tasmania, Victoria, South Australia, New South Wales, and Western Australia) Australian abalone fisheries has contrasted with many of those elsewhere that exhibited rapid and sustained declines in production. Australian abalone fisheries are significant at local, regional, state, national, and international scales. Key attributes are (1) harvesting, processing, and reinvestment of profits occur away from major metropolitan centers; (2) they are among the most valuable wild-catch species in all states; (3) the combined Australian abalone harvest in 2011 (>4,500 t) had a landed value of ∼AU$200M and represented 15% of the Australian total wild-catch production; and (4) this level of production made these fisheries the dominant contributor (60%) to global wild-catch abalone production. Unlike many other abalone fisheries, total catches were controlled by limited entry, quotas, size limits, and geographic boundaries, overseen by stringent compliance regimes, early in their history. Subsequently, state-based research programs, explicitly tasked with providing scientific advice to support management decisions, undertook assessments to match harvests with stock productivity. This information upon which to base management decisions contributed to long-term (>20 years) stable harvests and enabled relationships among stakeholders to develop around consideration of the information and advice for management. In general, rights-holders developed stewardship for the resource, and this has led to numerous important outcomes, including evolving resource co-management and a nationally representative industry entity, the Abalone Council of Australia. The Abalone Council of Australia, state-based industry entities, and ongoing relationships among rights-holders, fishery managers, and researchers play vital roles in addressing and overcoming current and impending challenges for these fisheries. These difficulties include (1) urban encroachment into coastal regions (the so-called "sea change" phenomenon); (2) a growing interest in access to the abalone resource, reflecting the increasing, culturally diverse Australian population; (3) the everpresent threat of illegal fishing; (4) recent total allowable commercial catch reductions, particularly in Victoria and New South Wales, to facilitate stock rebuilding; (5) changing market conditions; (6) declining profitability from increasing operational costs and appreciation of the Australian dollar; and (7) environmental changes, such as prolonged drought and warmer seas associated with shifts in climate. Overall, this review demonstrates that abalone can be harvested sustainably over extended periods, despite aspects of their demography that suggest higher vulnerability to overexploitation, providing the management systems that control harvesting activities and external impacts that encompass several key underpinning elements. This review also identifies likely challenges to sustained production and shows that the future of ...

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“…With the advent of equipment used for electronically measuring and logging abalone shell size, it is now feasible to use the average shell length in the commercial catch as a performance measure (Mayfield [2010]). The ALCC strategy relies on three parameters to drive it.…”

Section: Average Length Of Commercial Catch [Alcc]mentioning

confidence: 99%

“…The existing strategy, as well as each alternative strategy, takes into account the same rules belonging to the existing adaptive management process. Mayfield [2010] provides the foundation for the commercial catch threshold strategy tested in this study. Sampling the length structure of commercial catch aboard divers' boats or upon returning to port vastly reduces the cost and uncertainty associated with fishery independent sampling on the seabed.…”

Section: Introductionmentioning

confidence: 99%

Assessing alternative management strategies for blacklip abalone

Bedford

Hearne

Wang

et al. 2011

Chan, F., Marinova, D. And Anderssen, R.S. (Eds) MODSIM2011, 19th International Congress on Modelling and Simulation.

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Unsustainability of abalone harvesting has become a worldwide trend. Australian abalone fisheries have thus far defied this seemingly inevitable path towards collapse, remaining generally sustainable until recently. Today unfavourable market and export conditions, disease, climate change, ecological shifts, and reduced catch quotas challenge the capacity of Australian abalone fisheries to remain sustainable into the future. Profits are down and the resilience of these fisheries is under threat. The two major stakeholders of the Australian abalone fishing industry are the commercial license owners and the government. The licence owner's goal is to maximise their annual catch whilst the main responsibility of government is to ensure the continued health of the fishery. In the early decades of the fishery both goals were relatively easily satisfied, however recent times have seen increased conflict between the two parties. Government is obliged to strongly consider the livelihoods of the licence owners whenever it applies annual changes to commercial harvesting strategies. However, it is faced with increasingly difficult decisions as abalone populations spiral into decline. Management of abalone fisheries has proved to be an onerous task over many decades. Abalone live near the shoreline and can be found down to 30 metres depth. Their populations from one reef to the next are as unpredictable as the rocky reefs they inhabit. Whilst many abalone are visible on the outer surface of a complex boulder system, it is difficult to accurately predict how many are hidden in inaccessible cracks and crevices.

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Enhancing fishery assessments for an Australian abalone fishery using commercial weight-grade data

Cited by 7 publications

References 36 publications

Modelling trends including effects of natural disturbance in an abalone dive fishery in Australia

Modelling trends including effects of natural disturbance in an abalone dive fishery in Australia

Fifty Years of Sustained Production from the Australian Abalone Fisheries

Assessing alternative management strategies for blacklip abalone

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