ugent aquaculture r&d consortium ghent university belgium · 2015-12-03 · fao, 2013 . by...
TRANSCRIPT
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Patrick Sorgeloos UGent Aquaculture R&D Consortium
Ghent University Belgium
Can aquaculture become
the new blue biotechnology of the future ?
FENACAM & LACQUA/SARA (WAS)’15 November 16-19, 2015
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Aquatic Products - Seafood
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Seafood sources
0
10
20
30
40
50
60
70
80
90
100
1950 1953 1956 1959 1962 1965 1968 1971 1974 1977 1980 1983 1986 1989 1992 1995 1998 2001 2004 2007 2010 2013
million tonnes live weight
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Variety in fishing techniques
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Contribution of aquaculture to world fish consumption
fisheries
aquaculture
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Fan Li, 200 BC
Aquaculture =
intervention of man in the production process of aquatic organisms
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Seafood sources
0
10
20
30
40
50
60
70
80
90
100
1950 1953 1956 1959 1962 1965 1968 1971 1974 1977 1980 1983 1986 1989 1992 1995 1998 2001 2004 2007 2010 2013
million tonnes live weight
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FAO, 2013
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by quantity
by value
FAO, 2009
Aquaculture production per region
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FOOD aquaculture
Asia, esp. China - long history - large production - integrated farming
BUSINESS aquaculture
Recent developments (since 1960s) • Japan, later Europe, America’s, etc • successful new industry • monoculture
FOOD versus BUSINESS aquaculture
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Integration livestock - fish
Small scale goat rearing integrated with fish in Subang
Small scale broiler chickens integrated with fish in Sukabumi
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Integration crop – fish/prawn/crab
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FOOD aquaculture BUSINESS aquaculture
Asia, esp. China - long history - large production - integrated farming
Recent developments (since 1960s) • Japan, later Europe, America’s, etc • successful new industry • monoculture
FOOD versus BUSINESS aquaculture
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BUSINESS aquaculture
biology technology profitability
monoculture approach
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Predictable availability of fry, fingerlings, postlarvae, seed, spores, ...
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Cage systems
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12,000 ton/yr salmon farm in Norway
operated by <10 people
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Courtesy Nutreco
Courtesy Harache
Pond systems
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Courtesy Harache
Tank systems
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Photo Eding Photo Schneider
Photo Schneider Photo Schrama
Recirculation systems
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WORLD SALMON PRODUCTION
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World shrimp production by species
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PANGASIUS CATFISH FARMING IN VIETNAM > 1,000,000 TONS/YEAR
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(surface area)
Pro
du
ctio
n (i
n 1
00
0 t
on
s
in
PANGASIUS CATFISH FARMING IN VIETNAM
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17,5 31,2 41,5
60 80
100
172
232
286
340
380
500
0
100
200
300
400
500
600
1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2005
Annu
al y
ield
(10
3 ton)
Year
annual production yields
Slide 9
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mussel farming
scallop farming
mollusc farming: 14 million ton / year
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red and brown
algae farming in China
seaweed farming: 21 million ton / year
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Population growth puts pressure on food resources
29
Global population growth is leading to increased demand for food (+70% by 2050) and pressure on natural food resources.
Animal livestock alone will not be capable to meet the need of 70% more proteins, due to its highly negative ecoprint.
Terrestrial farming will need 30% more land to meet increased demand. By 2030, a lack of fresh water for agriculture is likely.
(source: FAO)
Source: SINTEF
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Ten years from now, aquaculture will need to produce 50 % more per year than current annual production
• Food security • Food safety • Western versus Asian industry approach • Industry consolidation versus small farmers subsistence • Level-playing field • Fair business for small farmers in Asia • Sustainability : economical, ecological, energy, resources
ISSUES AT STAKE
Challenges, threats & opportunities
for future aquaculture
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resulting in new concepts & products
for a sustainable aquaculture
from an empiricial approach
towards
a knowledge-based bio-industry
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- Complete independence from natural stocks through DOMESTICATION
- Improved / more cost-effective SEED PRODUCTION
- Better targeted SPECIES SELECTION
- Development of more efficient stocks through SELECTIVE BREEDING
- More MICROBIAL MANAGEMENT for more sustainable production
- Better understanding of IMMUNE SYSTEMS in vertebrates and invertebrates
- More INTEGRATED PRODUCTION SYSTEMS for plant and animal farming
- COASTAL AND OFF-SHORE FARMS of food and energy
- Full independence from fisheries stocks for LIPID AND PROTEIN INGREDIENTS in aquatic feeds
- More attention for INTEGRATION of restocking activities with FISHERIES management
- SOCIETAL LEVERAGE:
- multi-stakeholder interaction
- international cooperation on a win-win basis
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market stocking
ongrowing
fry
postlarvae
seed
larvae
eggs
sperm
embryos
broodstock
spawners
wild wild wild wild
market
Complete independence from natural stocks through domestication, opening the way for selective breeding programs
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Improved / more cost-effective SEED PRODUCTION
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Predictable & cost-effective availability of
high-quality fry, fingerlings, postlarvae, seed,
spores, ...
THE key to successfull aquaculture !
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example: Sea bass/bream larviculture in the Mediterranean
• annual production of 1 billion fry
• market value of 15 Euro cents a piece
• average survival 20 % by day 60
• low survival = critical bottleneck for future cost efficiency and sustainability of the industry
• microbial interference considered to be the main culprit
• no selected breeds available yet
Improved / more cost-effective SEED PRODUCTION
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host
environment
COMPLEX GNOTOBIOTIC
microbial community
NEW APPROACH IN THE STUDY OF HOST-MICROBE INTERACTIONS
host
known microbial community
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Development of innovative microbial management systems
pre/probiotics
biochemical analyses
host-gene expression
analysis &
identificationmarker genes
qual/quant analysis of bacterial
composition
performance: survival
growth challenge test
immunostimulants
gnotobiotic Artemia system
FISH & SHELLFISH
LARVAE VALIDATION
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ARTEMIA AS MODEL SYSTEM IN LARVICULTURE RESEARCH
• host-microbe interactions
Influencing microbial numbers or activity
quorum sensing / quorum quenching
Poly-β-hydroxybutyrate
Stimulating the host’s immune response
heat shock proteins
yeast cell wall-bound glucan
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bacteria sense and respond to environmental changes
and to each other through extracellular
signal molecules ≈ hormones in higher organisms
Quorum Sensing (QS)
AHA!
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Presence of QS signal molecules affects gene expression
f.ex. virulence factors (biofilm formation, toxin secretion, etc.)
LuxS LuxQ
LuxP
LuxM
LuxN CqsS
CqsA
LuxU
LuxO
LuxR
sRNA’s + Hfq
σ54
HAI-1 AI-2
OH
O
CAI-1
Promoter of
target genes
OOB
-
O
OH
OH
OH OH
vibrios
NO
OH
H OH O
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use of QS inhibitors (e.g. plant extracts)
degradation of QS signals by other bacteria
0
20
40
60
80
100
Su
rviv
al
(%)
0
20
40
60
80
100
Su
rviv
al
(%)
0
20
40
60
80
100
Su
rviv
al
(%)
Artemia Vibrio harveyi
Macrobrachium Vibrio harveyi
Burbot Aeromonas hydrophila
Crustaceans: 10-100 µM Fish: 0.01 µM
QS-disruption to control bacterial infections
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Signal
0
1
2
3
4
5
6
0 3 6 9 12
[HH
L] (
mg
/L)
Time (h)
Control
LT3
LT12
LCDR16
QS-disruption to control bacterial infections
use of QS inhibitors (e.g. plant extracts)
degradation of QS signals by other bacteria f.ex. Bacillus strains isolated from aquatic organisms
sign
al m
ole
cule
co
nce
ntr
atio
n
signal molecule degradation
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0
10
20
30
40
50
60
Surv
ival
(%
)
QS-disruption to control bacterial infections
use of QS inhibitors (e.g. plant extracts)
degradation of QS signals by other bacteria use of signal-degrading probionts in Macrobrachium larviculture
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NOVEL MICROBIAL CONTROL STRATEGY
FOR ROTIFERS IN FINFISH HATCHERIES
E. Bequé1, G. Rombaut1 and T. De Wolf2
1 INVE Technologies NV, Belgium 2 Maricoltura di Rosignano Solvay, Italy
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Tests - rotifers
Bacterial load
Total of heterotrophic bacteria was determined by platings on
Marine Agar medium
Total of Vibrio was determined by platings on TCBS medium
CONTROL TREATMENT
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Test results - seabream
Increased survival rate
Effect on performance of seabream larvae was determined in
2 consecutive trials (no replicates).
0
5
10
15
20
25
30
35
% s
urv
iva
l
Trial 1 Trial 2
Larval performance of seabream (60 dph)
Control Treatment
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ARTEMIA AS MODEL SYSTEM IN LARVICULTURE RESEARCH
• host-microbe interactions
Influencing microbial numbers or activity
quorum sensing / quorum quenching
Poly-β-hydroxybutyrate
Stimulating the host’s immune response
heat shock proteins
yeast cell wall-bound glucan
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highly conserved proteins, available in all living cells
Induced after exposure to stressors (heat, cold,
O2 deprivation, radicals, disease etc)
Inside the cell, act as molecular chaperones – assist in protein biogenesis and degradation
Extracellular Hsps serve as danger signals and modulate both innate and adaptive immune responses
Heat shock proteins (Hsps) Hsp
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Survival after Vibrio challenge
Hsps effects in Artemia - Vibrio challenge test
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Endogenous Hsp accumulation Survival after Vibrio challenge
Hsp70
Hsp70
Correlation exists between enhanced protection and Hsp70 accumulation
Hsps effects in Artemia - Vibrio challenge test
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heat shock is not an ideal way to enhance Hsps in aquaculture
less traumatic approaches are needed to manipulate Hsps expression
can compound(s) extracted from plants induce Hsp70 in aquaculture animals?
can they confer protection against stress and disease ?
new concept: use of Hsp-inducing compounds
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Survival after Vibrio challenge
2-fold
Protective effect of Hsp-inducing compounds against Vibrio harveyi
--------- Hspi concentration----------
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Induction of Hsp70 Survival after Vibrio challenge
100
75
Marker Hela cells control Hspi
2-fold
Protective effect of Hsp-inducing compounds against Vibrio harveyi
--------- Hspi concentration----------
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IAQ TOP Meeting 12-13 January 2012
Application phytochemical mix prior/during transport
PL transport trial
Hatchery health protocols: New HSP technology increases stress resistance
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> 40 mT of fish & shrimp are produced in ponds
What is the role of the microflora ?
Recent documentation:
30 % N contribution from bio flocs !
BIO FLOCS
more MICROBIAL MANAGEMENT for more sustainable production
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Volume of bioflocs formed per day in different C/N regimes
C/N 10 C/N 50
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Various Critical - Multifactorial Causes? microbial diversity & stability compromised? mature/aged water versus facilitating opportunitistic bacteria
(Vibrio spp.)
fry/postlarval competence compromised? production cost savings (dietary treatments, stocking stage, ...)
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Various Critical - Multifactorial Causes? microbial diversity & stability compromised? mature/aged water versus facilitating opportunitistic bacteria
(Vibrio spp.)
fry/postlarval competence compromised? production cost savings (dietary treatments, stocking stage, ...)
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60
Microbial control:
Specific pathogens and opportunists
• Specific pathogens may be
stopped by strong hygienic
barriers into the system:
BIOSECURITY!
• A lot of the problems in aquaculture
caused by naturally occurring
opportunistic bacteria that become
pathogenic when the host is
weakened by environmental stress
• It is possible to set up selection to
outcompete the opportunists!
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Generally one out of two different strategies favoured:
Ecological r/K-theory
Selection Environment Substrate supply
bacteria
Favoured ability
r-selection Unpredictable/unstable,
Empty niches
High
Rapid reproduction,
Fast growth
K-selection Stable or predictable,
crowded
Low,
Close to CC
Competing on limited
resources
Carrying capacity (CC)
= Max biomass/number of bacteria that can be maintained in the system over time
Depends on:
Supply of available organic matter
Opportunists
Specialists
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The first-feeding ecosystem:
marine fish hatchery Fish larvae (top predator)
Zooplankton
Phytoplankton Bacteria
DOM
1g/30 days
0.3g/30 days
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Larval microbial community
DAH 8 DAH17 DAH32 DAH61
Large temporal variation
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FTS 1 FTS 2 FTS 3 MMS 1 MMS 2 MMS 3
% S
urv
iva
l
0
5
10
15
20
25
30
35
40Survival to day 60 ph (end of experiment)
Survival to day 32 ph (live feed period)
K-selection: Microbial maturation
Effects on the microbial
community composition
of the incoming water:
A more stable, even and diverse
community dominated by slow-
growing specialists
Effect on the fish:
Significantly higher survival
larval microbiota similar to
live food microbiota
larval and water microbiota similar
flow through system
microbially matured water
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Ecological context of opportunistic pathogens in aquaculture
mainly opportunistic pathogens cause disease in aquatic young animals, especially under stress conditions
Disinfection: decreased bacterial numbers
Feeding: increased carrying capacity
Source: De Schryver et al. (2014). ISME Journal, 1 - 9
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Ecological context of opportunistic pathogens in aquaculture
mainly opportunistic pathogens cause disease in aquatic young animals, especially under stress conditions
Disinfection: decreased bacterial numbers
Feeding: increased carrying capacity
Source: De Schryver et al. (2014). ISME Journal, 1 - 9
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Application of microbially matured water systems
after the r-strategist pioneer community comes the K-strategist mature community
Disinfection: decreased bacterial numbers
Feeding: increased carrying capacity
Source: De Schryver et al. (2014). ISME Journal, 1 - 9
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Empirical observations of the strategy of microbial-matured water
• Algae-rich greenwater systems
• Probiotics
• Tilapia co-culture
• Biofloc systems
• Recirculation systems
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Better understanding of IMMUNE SYSTEMS in vertebrates and invertebrates
DISEASE PREVENTION
consumer environment
DISEASE TREATMENT
(antibiotics)
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diagnostics
immunology
vaccines
quarantine
Better understanding of IMMUNE SYSTEMS in vertebrates and invertebrates
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1. Complete independence from natural stocks through DOMESTICATION
2. Improved / more cost-effective SEED PRODUCTION
3. Better targeted SPECIES SELECTION
4. Development of more efficient stocks through SELECTIVE BREEDING
5. More MICROBIAL MANAGEMENT for more sustainable production
6. Better understanding of IMMUNE SYSTEMS in vertebrates and invertebrates
7. More INTEGRATED PRODUCTION SYSTEMS for plant and animal farming
8. COASTAL AND OFF-SHORE FARMS of food and energy
9. Full independence from fisheries stocks for LIPID AND PROTEIN INGREDIENTS in aquatic feeds
10. More attention for INTEGRATION of restocking activities with FISHERIES management
Priorities for future technology innovation
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More INTEGRATED PRODUCTION SYSTEMS for plant and animal farming
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EXTRACTIVE aquaculture
nutrient recycling
FED aquaculture
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COASTAL AND OFF-SHORE FARMS for food seaweed and molluscs
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integration of culture of different trophic levels
MACROALGAE
MOLLUSCS
FINFISH
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Integrated culture of fish, molluscs and seaweeds
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8 km
COASTAL AND OFF-SHORE FARMS for food
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Multi-trophic aquaculture - for food production integrating - for bioremediation different niches of the ecosystem: fish, shellfish & seaweeds and maximizing nutrient recycling
COASTAL AND OFF-SHORE FARMS for food and energy
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COASTAL AND OFF-SHORE FARMS for food and energy
- )
Energy generation (wind, wave, thermal)
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1. Complete independence from natural stocks through DOMESTICATION
2. Improved / more cost-effective SEED PRODUCTION
3. Better targeted SPECIES SELECTION
4. Development of more efficient stocks through SELECTIVE BREEDING
5. More MICROBIAL MANAGEMENT for more sustainable production
6. Better understanding of IMMUNE SYSTEMS in vertebrates and invertebrates
7. More INTEGRATED PRODUCTION SYSTEMS for plant and animal farming
8. COASTAL AND OFF-SHORE FARMS of food and energy
9. Full independence from fisheries stocks for LIPID AND PROTEIN INGREDIENTS in aquatic feeds
10. More attention for INTEGRATION of restocking activities with FISHERIES management
Priorities for future technology innovation
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Global primary production and food supply
total bioproduction contribution to
food supply
terrestrial
marine
from Field et al. (1998) and Duarte et al. (2009)
plants & animals
fisheries & aquaculture
plants & animals
pro
tein
s
qu
an
tity
16 % of proteins 2 % in quantity
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www.aquaculture.ugent.be