Presentation on theme: "What will be discussed at today’s forum? Dr Nick Rayns (AFMA) –management measures including localised depletion definition and possible options. Assoc."— Presentation transcript:
What will be discussed at today’s forum? Dr Nick Rayns (AFMA) –management measures including localised depletion definition and possible options. Assoc. Prof. Tim Ward (SARDI) –2014 egg survey results for Jack Mackerel, Blue Mackerel and Australian Sardine (east). Dr Tony Smith (CSIRO) –re-examination of the harvesting rules for each of the SPF species. Other important issues identified by forum participants.
Small Pelagic Fishery Management & Localised Depletion SPF Stakeholder Forum 17 October 2014 Dr Nick Rayns Executive Manager, Fisheries Management
The Small Pelagic Fishery
Species and Biology Jack Mackerel (Trachurus declivis, T murphyi) Redbait (Emmelichtys nitidus) Blue Mackerel (Scomber australasicus) Australian Sardine (Sardinops sagax) East and West StockEastern stock and possibly separate stocks between E and SW Tas Different stocks across Australia Some evidence of spatially distinct stocks School over the continental shelf and outer shelf margin in m of water between WA and QLD School m deep in continental shelf breaks, seamounts and ridges between NSW and S.W. WA School m deep across the continental shelf in southern, temperate and subtropical waters between WA and S. QLD School over the continental shelf between Rockhampton (QLD) and Shark Bay (WA) Max 470mm TL, 17 yrs Max 335mm FL in Aus, 21 yrs (females) and 18 yrs (males) Max 440mm FL, 7-8 yrs Max 250mm FL, 8 yrs Females mature at 315mm TL and spawn mid-Dec to mid-Feb In SW Tas, males mature at 261mm FL and females mature at 244mm FL. In E. Tas males mature at 157mm and females mature at 147mm FL. Spawn Sept-Nov 50% males mature at 237mm, 50% females mature at 287mm and spawn summer-early autumn in S. Aus and winter-spring off NSW 50% males mature at 146mm, 50% females mature at 150mm. Spawn between Jan-April in SA, Jan-June in WA and July- Dec in NSW Note: TL = Total Length; FL = Fork Length
Fisheries Management in Context
AFMA’s management of the SPF Objective Conservative harvest rates that recognise the importance of small pelagic fishes to the ecosystem and for all users. Catch Control Management The SPF Harvest Strategy recommends harvest rates, and Limits the amount of each stock that can be harvested. Assessments of east and west zones The best available science is used through annual stock assessments, and Egg surveys and other relevant research such as catch/effort information are used in the assessment.
More about AFMA’s management of the SPF Managing Bycatch SPF midwater trawl vessels must have AFMA-approved plans and technical solutions in place to minimise interactions with seals, dolphins and seabirds: -this includes a seal excluder device and a vessel- specific management plan that sets out measures to reduce the risk of interactions. Stakeholder Consultation AFMA consults through the SPF Resource Assessment Group, South East Management Advisory Committee, and recreational and environmental forums.
Midwater Trawl and Purse Seine Methods
Seal Excluder Device
And even more about AFMA’s management of the SPF Monitoring Fishing Activity Commonwealth fishing vessels are fitted with a GPS tracking system to monitor their movements while at sea that AFMA compliance can view 24/7. Observers collect scientific information on the fishing operation with 100% coverage on any new midwater trawl vessel for at least the first 10 trips. AFMA’s risk-based compliance and enforcement program is described at: fisheries/compliance-activities/.http://www.afma.gov.au/managing-our- fisheries/compliance-activities/
Catches in the SPF 1984/85 to 2012/13
Markets and where SPF catches are used In the mid 1980s the purse seine fishery caught large volumes of fish that were processed at plants at Triabunna for fish meal, oil for aquaculture feed, frozen to feed Southern Bluefin Tuna, bait, human consumption and pet food. Currently smaller catches in the SPF are primarily sold as fishing bait. Catches of small pelagics from waters adjacent to Tasmania (where the majority of catches occurred between 1984 to 2009).
The Small Pelagic Fishery Resource Assessment Group’s working definition of localised depletion “a persistent reduction in fish abundance in a limited area, caused by fishing activity, over spatial and temporal scales that causes a negative impact on predatory species and/or other fisheries.” Considerations in developing the working definition: Species mobility matters Geographic barriers matter It is different from changes in range or overall abundance Can lead to user conflict, but is not always the cause The SPF definition may not be applicable to all fisheries Please note that the working definition is the subject of further consideration, including by this forum.
What do other fisheries do to manage the risk of localised depletion? Alaskan Pollock Fisheries Catch limits for pollock and Atka mackerel, both important prey for sea lions in Alaskan waters, are spatially and seasonally apportioned into smaller sub-TACs to prevent prey removals from occurring all at once in localised areas. South African Pelagic Fishery Implementing spatial closures to fishing for sardine and anchovy were demonstrated to be highly effective in increasing the numbers of African penguins breeding that feed primarily on these small pelagic species. In both fisheries these management measures are precautionary and their benefits remain unproven, even with large R&D investments by the fisheries and countries concerned.
And an Australian fishery…… South Australian Sardine Fishery (SASF) The SASF has historically taken around 30,000 tonnes pa of Australian Sardine from southern Spencer Gulf and an ecosystem assessment has identified that localised depletion is not of great concern. The SASF has implemented a spatial management framework to limit the proportion of catch taken from southern Spencer Gulf and introduced size-based biological performance indicators into the harvest strategy.
Possible move-on rules to manage any risk of localised depletion in the SPF – an example
Questions: 1.Is the working definition of localised depletion sufficient to meet the recreational fishing sector needs? 2.How should we manage any risk of localised depletion in the Commonwealth Small Pelagic Fishery, and what are we trying to achieve in doing so? 3.Other questions and possible solutions from participants?