sustainability and environmental impacts of food from the sea · fish stocks are inevitably...
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Sustainability and Environmental Impacts of Food from the Sea
Ray Hilborn
School of Aquatic and Fishery Sciences University of Washington
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Structure of talk
• This history of Gloom and Doom
• What the data tell us about status
• The environmental impacts of food from the sea
• Will not talk about economic status of fisheries or social impacts of fishing status and management
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The history of Gloom and Doom
Science Magazine 1993
Fish stocks are inevitably overexploited before effective management is initiated
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Pauly et al. (1998)
Global catch MTL Pauly’s 1998 Fishing down food webs
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Nature 2003
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All fish gone by 2048
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What the public believes
• Most fisheries are unsustainably managed
• Stocks worldwide are declining
• The act of fishing destroys the environment
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NCEAS working group: Finding common ground in marine conservation and management
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Abundance trends of assessed stocks
1950 2000
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Stock Size
Fish
ing
Pre
ssu
re
Maximum Sustainable Yield
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Stock Size
Fish
ing
Pre
ssu
re
Fully Exploited
Overfishing
Under exploited
Overfished and
overfishing
Over fished
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Stock Size
Fish
ing
Pre
ssu
re
Fully Exploited
Overfishing
Under exploited
Overfished and
overfishing
Over fished
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Fro
m W
orm
et
al. 2
00
9
Stock Size
Fish
ing
Pre
ssu
re
Assessed stocks in industrial and developed countries
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Fro
m W
orm
et
al. 2
00
9
Stock Size
Fish
ing
Pre
ssu
re
Assessed stocks in industrial and developed countries
Rebuilding Stocks
Problem Stocks
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Fox model
Equilibrium biomass relative to MSY
Fre
qu
en
cy
0.0 0.5 1.0 1.5 2.0 2.5 3.0
05
10
15
20
25
Where we end up under current fishing pressure
Equilibrium biomass relative to BMSY
Above BMSY Sustainable
Big Problems
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Were the Prophets of Doom correct?
• Ludwig Hilborn and Walters 1993
– For much of the world yes, overexploitation was the norm before management was imposed
– BUT there were exceptions,
– New Zealand and Alaska stand out as regions that absorbed the lessons of the rest of the world, and because they developed industrial fishing much later avoided any systematic overfishing
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Current data
Pauly et al. (1998)
Branch et al. (2010) Nature 468:431-435
Global catch MTL Fishing down food webs
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Demise of world tuna stocks
From Juan-Jorda et al. 2011. PNAS.
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From Juan-Jorda et al. 2011. PNAS.
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How have the successes been achieved
• A wide suite of “traditional” tools
– Catch limitation especially hard TACs
– Fleet reduction
– Area closures
– Gear restrictions
• There is no silver bullet
– Neither catch shares or MPAs have proved to be a necessary or sufficient condition
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What about the rest of the world?
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FAO SOFIA
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0
10
20
30
40
50
60
0 5,000,000 10,000,000 15,000,000 20,000,000
% o
f st
ock
s o
vere
xplo
ite
d
2007 Catch (Tonnes)
Central and S. Atlantic, Mediterranean
NW Pacific
S.W. Pacific
Peru, ChileEuropeW. Indian Ocean
E. Indian Ocn
NW Atl
FAO regional analysis
These areas are all in better shape than reported by Worm et al. 2009 where we reported 2/3 stocks below BMSY
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Gloom and Doom is real in some places
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0
0.2
0.4
0.6
0.8
1
1.2
1975 1980 1985 1990 1995 2000 2005 2010
B/B
MSY
Unassessed stocks
Assessed Stocks
Costello et al. (submitted) status of major fish stocks
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Summary of capture fisheries status
• Major industrial fisheries where we have assessments appear to be stable and mostly rebuilding because of reduced fishing pressure
• In some countries there remain many stocks with excess fishing pressure
• Major fisheries in the rest of the world on average have better or the same status, but appear to be declining. – No evidence of effective fisheries management
• Sustainability is a process, not a stock size
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We can sustainably produce food from the sea
but at what environmental cost?
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Science Magazine 2010
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Measures of environmental impact
Inputs
• Energy
• Freshwater
• Fertilizer
• Pesticides
• Antibiotics
• Surface area impacted
Outputs
• Greenhouse gases
• Eutrophication potential
• Acidification potential
• Soil erosion
• Biodiversity loss
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Energy intensity of food production
Crops Land animals Fish Pelletier et al. 2011. Ann Rev. Env. Resources
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Environmental costs per 40g protein
Water (L)
Fertilizer (g)
Pesticides (mg)
Antibiotics (mg)
Soil Loss (kg)
Beef 2200 50 494 21 16
Chicken 1331 18 163 55 3
Pork 1331 46 422 53 8
Dairy 1178 34 299 50 7
Capture fisheries 1 0 0 0 0
Global Averages or combined studies where available
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New Zealand dairy meat and fish compared to international
per 40 g protein
Energy MJ
Fresh Water (l)
Fertiliser (g)
Pesticides (mg)
Antibiotics (mg)
Surface area impacted (m2)
Greenhouse gasses (kg)
New Zealand Dairy
1.56 171 26
24
1.17 1.24
0.86
New Zealand Meat
4.90 262 188
129
1.17 18.14
3.70
International Dairy
3.62 Na Na Na Na 1.63
1.26
International Beef
10.86 Na Na Na Na 9.35
5.97
Squid
7.11 0 0 0 0 17
0.62
Hoki
7.31 0 0 0 0 100
0.64
From Hilborn and Tellier 2012
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What about aquaculture?
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Global warming potential T CO2/T bread wheat 0.8 oilseed rape 1.7 potatoes 0.24 tomatoes 9.4 beef 16 sheep 17 swine 6 poultry 5 bivalves 0.5
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Eutrophication kg PO4 equivalent bread wheat 3.1 oilseed rape 8.4 potatoes 1.3 tomatoes 1.5 beef 160 sheep 200 swine 100 poultry 49 bivalves -4.9
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Biodiversity impacts of capture fisheries, aquaculture, agriculture
• Capture fisheries are sustained by maintaining semi-natural ecosystems
• Agriculture relies on replacing natural ecosystems with highly productive exotic species
• Aquaculture falls somewhere in between
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From Biodiversity in a forest-agriculture mosaic – The changing face of West African rainforests Ken Norris Biological Conservation 2010
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My son modifying biodiversity
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Organic vegetable field my wife farmed
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Fisheries may have less biodiversity cost than organic agriculture
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Some numbers easily found on the web
• 20.3 million tons of livestock production from grazing (Long shadow of livestock)
• 34 million km2 of land used for grazing (Long shadow of livestock)
• 0.6 tons/km • 81.9 million tons fish landed 2006 FAO 2008
• Would require 139 million km2 grazing lands • There are 6.2 million km2 of rainforest left
http://rainforests.mongabay.com/0101.htm
• Would need 22.3 times world rainforests area to replace world fish production by grazing at world average grazing productivity
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Good citizens at work
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Rapers and Pillagers of the environment
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The environmental cost of precautionary marine conservation
• Many groups advocate precautionary marine conservation as an unqualified environmental benefit – Very low exploitation rates as seen in the U.S. – Closing large areas of the ocean such as the proposed
Coral Sea closure in Australia – Reduced harvesting of forage species
• There is a real net environmental cost – the lost food production will be made up by either clearing more land, or more intense use of irrigation, fertilizer and pesticides
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Marine conservation tradeoffs The Orangutan equivalent
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Close a forage fishery to save birds and mammals
• Peruvian anchovetta fishery 8 million tons
• 0.00115116 orangutan’s habitat lost per ton of palm oil produced
• Stopping forage fishing on Peruvian anchovetta would cost the habitat of 4,604 orangutans if the food energy of anchovetta was replaced with palm oil
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Conclusion
• We do know how to sustainably manage fisheries in places with effective top-down governance – We need to apply the lessons learned to places that are slow to
change management
• But we need to understand carefully why fisheries are working in some places and not others, especially when we consider the economic and social dimension
• Many parts of the world either have not absorbed these lessons or lack the governance – But other tools are available
• Capture fisheries and aquaculture are a major part of global food security, and their environmental impacts should be compared to alternative forms of food production