THE STATE OF THE STOCKS AT GLOBAL AND REGIONAL LEVELS ...€¦ · AT GLOBAL AND REGIONAL LEVELS –...
Transcript of THE STATE OF THE STOCKS AT GLOBAL AND REGIONAL LEVELS ...€¦ · AT GLOBAL AND REGIONAL LEVELS –...
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THE STATE OF THE STOCKS AT GLOBAL AND REGIONAL LEVELS – where are we and where are we heading?
Ray HilbornSchool of Aquatic and Fishery SciencesUniversity of Washington Rome, 18-21 November 2019
International Symposium on Fisheries Sustainability:Strengthening the Policy-Science Nexus
Session 1Panel 1.1
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International Symposium on Fisheries Sustainability
By 2020, effectively regulate harvesting and end overfishing, illegal, unreported and unregulated fishing and destructive fishing practices and implement science-based management plans, in order to restore fish stocks in the shortest time feasible, at least to levelsthat can produce maximum sustainable yield as determined by their biological characteristics.
Sustainable development goal 14.4
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FAO STATE OF THE WORLD FISHERIES: global trends in stock status
FAO SOFIA 2018
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Y Ye
FAO STATE OF THE WORLD FISHERIES: regional stock status
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stocks coveredstocks not covered
Average annual marine catch (106 t)
STOCK ASSESSMENT COVERAGE IN RAM LEGACY DATABASE
www.ramlegacy.org
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Mea
n of
ass
esse
d st
ocks
45%
Total landings represented
20%
Total stocks represented
Fishing pressure relative to target
Fraction compared to all stocks in FAO landings database with catch > 1,000 MT
ASSESSED STOCKS: OVERAL GLOBAL TRENDS
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Mea
n of
ass
esse
d st
ocks
ASSESSED STOCKS: OVERAL GLOBAL TRENDS
Fishing pressure relative to MSY target
Biomass relative to MSY target
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Fishing pressure relative to target
Biomass relative to target
REGIONAL GLOBAL TRENDS
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PROPORTION OF POTENTIAL YIELD LOST BY FISHING TOO HARD
Potential yield by full exploitation
Yield at current fishing pressure
Yield lost by fishing too hard
Frac
tion
of p
oten
tial y
ield
Year
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WHAT DO WE KNOW ABOUT UNASSASSED STOCKS IN S. and SE ASIA?
0
5
10
15
20
25
1950 1960 1970 1980 1990 2000 2010
Catc
h in
MM
T
Landings in S. and SE Asia Increase in fishing capacity
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POSSIBLE EXPLANATIONS FOR INCREASING TREND IN CATCH of S. and SE ASIA
• Expansion of fishing grounds• Increasing effort so on the verge of collapse• Long lived species disappearing and replaced
by higher productivity of short lived species
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METHODS OF ASSESSING THE UNASSESSED STOCKS
FAO Area Status relative to MSY target
Assessed Stocks
Status relative to MSY target
Ensemble method
Catch/ maximum catch
NE Atlantic 1.3 0.97 0.24
NE Pacific 1.84 1.02 0.31
Western Central Pacific
NA 1.06 0.69
Eastern Indian Ocean
NA 1.04 0.75
Mediterranean Black Sea
0.52 0.96 0.28
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FAO Area Status relative to MSY target
Assessed Stocks
Status relative to MSY target
Ensemble method
Catch/ maximum catch
NE Atlantic 1.3 0.97 0.24
NE Pacific 1.84 1.02 0.31
Western Central Pacific
NA 1.06 0.69
Eastern Indian Ocean
NA 1.04 0.75
Mediterranean Black Sea
0.52 0.96 0.28
METHODS OF ASSESSING THE UNASSESSED STOCKS
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FAO Area Status relative to MSY target
Assessed Stocks
Status relative to MSY target
Ensemble method
Catch/ maximum catch
NE Atlantic 1.3 0.97 0.24
NE Pacific 1.84 1.02 0.31
Western Central Pacific
NA 1.06 0.69
Eastern Indian Ocean
NA 1.04 0.75
Mediterranean Black Sea
0.52 0.96 0.28
METHODS OF ASSESSING THE UNASSESSED STOCKS
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0 0.2 0.4 0.6 0.8 1Poor Good
updated from Melnychuk et al. 2017, PNAS
FISHERIES MANAGEMENT INDEX: Average Management Intensity
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0 0.2 0.4 0.6 0.8 1Poor Good
updated from Melnychuk et al. 2017, PNAS
FISHERIES MANAGEMENT INDEX: Expert opinion on stock status
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MORE FISHERIES MANAGEMENT LEADS TO LOWER FISHING PRESSURE
Fish
ing
pres
sure
rela
tive
to M
SY ta
rget
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Stoc
k Bi
omas
s rel
ativ
e to
MSY
targ
et
MORE FISHERIES MANAGEMENT LEADS TO MORE ABUNDANT STOCKS
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International Symposium on Fisheries Sustainability
By 2020, effectively regulate harvesting and end overfishing, illegal, unreported and unregulated fishing and destructive fishing practices and implement science-based management plans, in order to restore fish stocks in the shortest time feasible, at least to levelsthat can produce maximum sustainable yield as determined by their biological characteristics.
Sustainable development goal 14.4
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CONCLUSIONS I
Intensive fisheries management helps meet the SDG 14.4 goals.
Without intensive assessment and management expert opinion suggest they are not trending in the right direction.
Management needs to improve in many countries.
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We need peer reviewed assessments of the major fisheries of the world.
In some places there is a need to improve the state of the stocks.
Scientific data collection, analysis, fisheries regulation and enforcement have been shown to work for large and small stocks in a wide range of countries.
CONCLUSIONS II
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International Symposium on Fisheries Sustainability
THANKS TO MANY COLLABORATORS
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