Aquaculture in a changing climate
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Transcript of Aquaculture in a changing climate
Edward H Allison
University of East Anglia, UKand
WorldFish Center Penang, Malaysia
Photo: Mehadi, WorldFish - Bangladesh
Aquaculture in a changing climate
Aquculture TriennialNashville, Tennessee, USA
22nd February 2013
Washington DC last weekend…
Percent of US citizens who believe global warming has already begun
McCright & Dunlap (2011) The Sociological Quarterly 52
Democrat Independent Republican
Gallup poll trends on % of US public support for questions about global warming
Global financial crisis
Overview• What are the predictions for future climate?• Evidence of recent climate change?• How is the aquaculture sector impacted?• How can aquaculture adapt? • Does aquaculture have a role in climate
change mitigation?• What research is needed?
Possible climate futures…World Bank (2012), Turn Down the Heat: Why a 4⁰C Warmer World
Must Be Avoided. Washington DC
Climate change will impact on water available for aquaculture
Sea level rise faster than originally predicted by IPCCRahmsdorf et al., (2012) Env. Res. Lett.
IPCC predictions
Measured
Satellite
Gauge
Extreme events: Globally, hurricanes are getting stronger but not more
frequent – but regional patterns differ. Same for droughts and floods
Maue (2011) Geophys. Res. Lett. (data updated 31/12/12)
Is current climte chngeAre anthropogenic GHG emissions the main cause of recent climate change?
An 800,000 yr time series of CO2 concentrations from Antarctic ice cores (NOAA, 2009)
Climate change impacts on aquaculture systems
Source: Pickering et al 2011
Pickering et al (2011) Vulnerability of aquaculture in the tropical Pacific to climate change, In Bell et al. SPC.
Human Activity
CO2 emissions
Other GHGs
> CO2 inoceans
Ocean acidification
< calcificationin shellfishAtmospheric warming
and changing weather patterns
Changing Ocean Currents
Rising SST
Sea level rise
More extreme weather events
Reduced oxygenation
Increased disease outbreaks
Changes in natural spat-fall
Spread of pests and alien species
Increased losses and direct damage to aquacultureinfrastructure
< growth and production> mortality≠ recruitment
Other drivers of change: population, growth, trade
Increased costs of production
Changes in production volume and value
adaptation in system management, transportation and marketing
Coastal floodingExtreme rainfallHigh winds and waves
Shift sites of production; grow different species
Changes in PP and food webs
Climate change and mollusc aquaculture (Allison et al., 2011)
Seawater warming and its implications for aquaculture: increased risks from disease?
e.g. PSP agent Alexandrium catenella in Puget Sound (Moore et al., 2008)
Not all climate change impacts are negativeHigher temperatures associated with enhanced recruitment to scallop
fisheries in the North Irish Sea (Shepherd et al., 2010)
Can current and anticipated demands for fish and seafood be met in a changing climate?
• World population to increase to 9.3 Billion by 2050
• Fish provides protein, minerals and vitamins (17kg/cap/yr)
• Marine capture fisheries close to maximum capacity
• Aquaculture growing faster than population in the last 30 years, specially in Asia
Modelling framework20 countries with LMEs producing 80% of global catch
Climate change and reduction fisheries
Fishmeal
+3% in 2050
Conclusions of the study• CC and marine fisheriesCC and marine fisheries ~ Food fish production +6.5%, Fishmeal +3%
by 2050
• Aquaculture:Aquaculture: Likely to produce enough fish to maintain and increase current consumption if recent trends in feed technology continue. FIFO would need to reduce to 50% of current.
• Capture fisheries: Capture fisheries: management efficiencymanagement efficiency also required to secure fish for direct consumption and for feed (likely).
• Aquaculture impacts could be transferred from fisheries to terrestrial commodities (e.g soya).
Merino et al (2012) Can aquaculture meet global seafood demand in changing climate? Global Environmental Change 22
Adapting aquaculture systems to change: a farm level view
Exposure + Sensitivity = Potential Impacts (IPCC, 2001)
Potential Impacts + Adaptive Capacity = Vulnerability
Daw et al (2008) for FAO
Adaptation and mitigation decisions under uncertaintye.g. Shrimp or rice in low-lying coastal Asia?
Photos: Mike Lusmore, WorldFish
A value-chain perspective on CC adaptation in aquaculture
Production valueFishing/AQ operationsCoastal infrastructure
IMPACT ON:
TECHNICALADAPTATION
INSTITUTIONALADAPTATION
VALUECHAIN
Sustainable seafood information
Energy efficient transport & storageProcessing methods
Energy saving technologiesEarly Warning SystemsFlood defensesFarmed species choices
Low carbon certificationEmissions accountingTariffs, taxes, subsidies
Weather linked insuranceRegional agreementsCommunity adaptation funds
CLIMATE CHANGE DRIVERS
Global warming potential
Aquaculture Production Phase
Hatchery / Wild stocking
Processing
Distribution
Fertilizers, chemicals
Capture fisheries,agricultural
products and wastes
Direct energy(light, heat, pumps etc)
Consumption
Waste Disposal
Feedproduction
Aquaculture’s contributions to global warming and it’s potential for mitigation
Life cycle analysis
Example: Salmon v. Tilapia
Salmon
Global Warming potential: 2160 kg CO2e / t
Contributing factors: feed (94 %) farm level energy use (3 %) smolts (3 %)
Pelletier et al. 2009
Tilapia (lake-based)
Global Warming potential: 1520 kg CO2e / t
Contributing factors: feed (92 %) farm level energy use (3 %) fingerlings (5 %)
Pelletier & Tyedmers 2010
27
Aquaculture compared with wild fish and other foods
From Hall et al., (2011) Blue Frontiers. WorldFish Center
Emission Reduction Opportunities – Farm Level
Reduction of energy and fuel use
Renewable energy use and generation
Feed substitution
Adoption of best management practises:Efficient conversion of feed to animal biomassImproved soil, water and waste management
Mitigation at the landscape level
• Integrated aquaculture-agriculture systems: use of aquaculture wastes (i.e. sludge) to form carbon stocks in agricultural soils
• Mangrove-friendly aquaculture (carbon sequestration rate of mangroves: 139 gC m-2 yr-1) => organic shrimp farming?
Synergy with adaptation measures:
Landscape-based mitigation can also reduce climate change vulnerability and promote adaptation (e.g. coastal protection)
Coastal wetlands and seagrass beds sequester more carbon per unit area than land based systems
Mangroves 139
Climate change research at
Sessions: Climate change and shellfish diseasesAcidification and shellfish aquaculture
Individual talks and posters: Climate change and bio-invasionsIntegrated multi-trophic aquacultureClimate vulnerability and adaptation (Florida,
West Africa)Mangroves and carbon markets
Related fundamental research: Hypoxia, thermal tolerance, salinity change, feeds
Climate change and aquaculture research needs• Identifying vulnerable people, places and farming
systems• Breeding and species selection for future climates• Cost-benefit analysis of adaptation options• Low-carbon farming systems• Climate-proofing value chains
Key messagesImpacts• complex, uncertain but already becoming evident• some winners some losers (equity and ethics considerations)
Adaptation• addresses both threats and opportunities• mostly ‘no regrets’• many businesses already adapting but little planned adaptation
Mitigation • aquaculture can help lower carbon footprint of the human diet• build ‘blue carbon’ stocks through landscape management
Thanks!
John CookseyJay ParsonsSandy Shumway
Anne Delaporte, Denis Hellebrandt, Neil Adger
Malcolm BeveridgeMike PhillipsSuan Pheng KamMarie-Caroline BadjeckSteve Hall
Manuel Barange Gorka MerinoNick Dulvy
Cassandra de YoungDoris Soto