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Role of marine reserves in sustainable management of Australia's ocean estate - review of the Heard Island and McDonald Islands bioregion

Project number: 2023-205
Project Status:
Current
Budget expenditure: $119,200.00
Principal Investigator: Travis J. Baulch
Organisation: TJB Management Pty Ltd
Project start/end date: 23 Jun 2024 - 29 Sep 2024
Contact:
FRDC

Need

The HIMI bioregion supports significant marine conservation values as well as a highly sustainable, and valuable commercial fishing industry. Typically, marine parks/reserve development processes are tasked with developing marine spatial planning arrangements that achieve a balance between preserving conservation values of the area and maintaining/promoting human activities through the principles of Ecologically Sustainable Development (ESD). However, key uncertainties remain regarding the policy priorities and how the final design of marine parks are objectively determined.

This project will provide an independent assessment of the framework used for original design of the HIMI Marine Reserve in 2002, the review in 2014, and the current review to provide recommendations for future development. The project will also explore how/if the policy objectives have been achieved since inception . Furthermore, this project will explore the potential of a quantitative risk-based approach to provide for minimising the uncertainties in the Marine Protected Area (MPA) development processes and deliver an objective framework.

In addition, the project will explore the current HIMI marine reserve framework, the associated commercial fishing industry arrangements and how they intersect with regard to:

Regulation
• Regulatory processes to minimise impacts of commercial fishing
• Legislative framework currently in place for Ecological Risk Assessment/ESD, Ecosystem-Based Fisheries Management, bycatch policy strategic research plans
• Marine Protected Areas review processes
• Statutory Fishing Rights (SFRs)

Economic impacts
• Commercial fishing viability
• Statutory fishing rights
• Permitted fishing gear types – (e.g. potential removal of MSC certified trawl fisheries with additional implications on research activity)

Biological impacts
• Impact on juvenile toothfish index of abundance and icefish estimates – accuracy of tracking stock will be significantly reduced if ability to trawl is removed (i.e. random stratified trawl survey impacted)
• Stock assessment model ability to consider toothfish population structure if longline fishery further constrained
• Climate change and effects of population shift
• Increasing policy position of MPAs as fisheries management tools
• Increased localised depletion and constrained ability to distribute commercial fishing effort

Social Impacts
• Market access
• Community sentiment

Objectives

1. Evaluate the technical approach used in the design of the HIMI marine reserve with specific reference to scientific and policy objectives
2. Examine management plan frameworks in regard to research outcomes since plan implementation
3. Provide recommendations in relation to review of the HIMI marine reserve

Final report

Authors: Travis Baulch Colin D. Buxton Rick Fletcher and Alistair J. Hobday
Final Report • 2024-11-01 • 2.10 MB
2023-205-DLD.pdf

Summary

The statutory requirement to undertake a 10-year review of the Heard and McDonald Islands (HIMI) Marine Reserve led to a proposal to expand the HIMI marine reserve and include new National Park Zones (IUCN II) and Habitat Protection Zone (IUCN IV) arrangements. Subsequently, the total area of the HIMI Marine Reserve has been increased to 379,070 square kilometres, a 400% increase over the previous marine reserve. This report aims to assess how current (and proposed) management frameworks relate to the National Representative System of Marine Protected Areas (NRSMPA) objectives, but also the extent to which they meet the overarching principles of Ecologically Sustainable Development (ESD) which requires holistic consideration of all relevant environment, social and economic objectives, as well as meeting obligations under various international legislation and conventions. As the expansion incorporates the area within which Australia’s Heard Island and McDonald Islands Fishery operates, this report explores the basis of the expansion with particular reference to the implications for future fishery arrangements, management frameworks and longer-term fishery viability. 
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People
PROJECT NUMBER • 2016-407
PROJECT STATUS:
CURRENT

Capability and Capacity: Nuffield Australia Scholarships

The Australian seafood industry has a long and proud history of employment of very sound environmental and economic management principles which have made it the envy of much of the world. An altogether robust Australian seafood industry is hyper critical to the social and economic fabric of...
ORGANISATION:
Nuffield Australia
Environment
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Developing and validating novel methods to estimate age- and size-at-maturity in South Eastern Australian fisheries

Project number: 2022-047
Project Status:
Current
Budget expenditure: $348,420.00
Principal Investigator: John R. Morrongiello
Organisation: University of Melbourne
Project start/end date: 29 Oct 2023 - 27 Sep 2026
Contact:
FRDC

Need

We submit this EOI to the priority ‘Biological parameters for stock assessments in South Eastern Australia – a information and capacity uplift’

Empirical observations from around the world have shown that intense fisheries harvest and oceanic warming can both lead to individuals reaching sexual maturity at younger ages and smaller sizes (Waples and Audzijonyte 2016). We know that younger and smaller mothers produce fewer eggs that may be of poorer quality than those from older and larger mothers (Barneche et al. 2018). Further, young mothers often need to build up their energy reserves before spawning each year, meaning that they experience a constrained spawning season. A shorter spawning window reduces the likelihood that their offspring will encounter an environment favourable for growth and survival (Wright and Gibb 2005). Harvest-induced declines in age and size at maturity have, for example, been implicated as one of the main drivers underpinning the collapse of Canadian Atlantic cod stocks (Hutchings and Rangeley 2011).

Environmental stress can also lead to poorer conditioned fish that lack the resources to spawn at all. The prevalence of ‘skip spawning’, as it is known, is hard to ascertain in wild populations but could be as high as 30% of the sexually mature biomass in some years (Rideout and Tomkiewicz 2011). Earlier maturity and skip spawning both have the potential to significantly impact on the biomass of sexually mature individuals in a stock and overall levels of recruitment success. Failure to properly account for these reproductive phenomena can lead to significant under- or over-estimation of SSB, which in turn leads to ineffective management advice that may heighten the risk of stock decline, unnecessarily limit catches, or impede stock recovery.

The rapid warming of southeast Australian waters has already been implicated in driving significant increases in the juvenile growth rates of harvested species, including tiger flathead, redfish and jackass morwong (Thresher et al. 2007, Morrongiello and Thresher 2015). It is plausible that these growth changes (predicted by eco-physiological theory, Atkinson 1994) are linked to commensurate, yet unknown, declines in age and size at maturity. Further, warmer waters may be stressing spawning adults (Portner and Farrell 2008), leading to an increased prevalence of skip spawning in southeast Australian fishes. Importantly, in recent times the biomass of several SESSF species has failed to recover despite significant management intervention. There is a real and pressing need to update the maturity parameters used in assessment models to reduce uncertainty in stock projections.

Our two-part project will refine and validate novel otolith-based methods to estimate an individual’s age at maturity and spawning dynamics from information naturally recorded in its otolith, and then apply this to existing otolith collections. AFMA already invests significant resources into the routine collection of otoliths for ageing purposes. In Part One of our project, we propose to value-add to these existing monitoring programs by developing new maturity and spawning assays that can be readily integrated into stock assessments to reduce model uncertainty and improve harvest strategies (FRDC strategic outcome 2 & 4), in turn bolstering community trust in projections (FRDC strategic outcome 5). In Part Two of our project, we will develop unprecedented insight into the reproductive history of SESSF stocks by recreating time series of maturity using archived otoliths that are currently sitting idle in storage.

Postgraduate students and early career researchers will play a central role in the development and delivery of our project. This experience will help provide a clear pathway for graduates into fisheries science. Our project will bolster the capacity and capability of fish ageing laboratories across Australia to deliver improved monitoring services to fisheries managers (FRDC enabling strategy IV).

More generally, we believe that our novel maturity and spawning assays have the potential to impact on fisheries assessment in other jurisdictions across the world that experience the same time and cost impediments we face here in Australia. Perhaps most excitingly, our assays have the potential to provide much needed maturity information to data poor and emerging fisheries across the Info-Pacific region using information in already collected otoliths.

References
Atkinson, D. 1994. Temperature and organism size: a biological law for ectotherms? Advances in ecological research 25:1-58.
Barneche, D. R., D. R. Robertson, C. R. White, and D. J. Marshall. 2018. Fish reproductive-energy output increases disproportionately with body size. Science 360:642-645.
Hutchings, J. A., and R. W. Rangeley. 2011. Correlates of recovery for Canadian Atlantic cod (Gadus morhua). Canadian Journal of Zoology 89:386-400.
Morrongiello, J. R., and R. E. Thresher. 2015. A statistical framework to explore ontogenetic growth variation among individuals and populations: a marine fish example. Ecological Monographs 85:93-115.
Portner, H. O., and A. P. Farrell. 2008. Physiology and climate change. Science 322:690-692.
Rideout, R. M., and J. Tomkiewicz. 2011. Skipped spawning in fishes: more common than you might think. Marine and Coastal Fisheries 3:176-189.
Thresher, R. E., J. A. Koslow, A. K. Morison, and D. C. Smith. 2007. Depth-mediated reversal of the effects of climate change on long-term growth rates of exploited marine fish. Proc. Natl. Acad. Sci. U.S.A. 104:7461-7465.
Waples, R. S., and A. Audzijonyte. 2016. Fishery-induced evolution provides insights into adaptive responses of marine species to climate change. Front. Ecol. Environ. 14:217-224.
Wright, P. J., and F. M. Gibb. 2005. Selection for birth date in North Sea haddock and its relation to maternal age. Journal of Animal Ecology 74:303-312.

Objectives

1. Refinement and validation of three methods to estimate the maturity and spawning history of SESSF species, using information naturally archived in fish otoliths
2. Identification of an accurate and cost-effective method to estimate fish age at maturity and spawning history from their otoliths
3. Recreation of the maturity and spawning history of a SESSF species using one of our three novel assays
4. Quantification of how rapid ocean warming and harvest have affected the expression of age at maturity and the propensity of a SESSF species to skip spawn
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