aquaculture presentation in al-quds university by dr.mutaz qutob
DESCRIPTION
aquaculture presentationTRANSCRIPT
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Aquaculture Defined?
• The art of cultivating the natural produce of water.
• Farming of aquatic organisms in natural or controlled marine or freshwater environments
• Rearing of aquatic organisms under controlled or semi-controlled conditions.
• Husbandry of organisms in an aquatic ecosystem
• Rearing of aquatic organisms under controlled or semi-controlled conditions
• Mariculture – (old name) marine or brackish water
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History of Aquaculture
• Egyptian tombs have bas-relief of fish (tilapia) being removed from ponds – 2500 B.C.
• Carp were farmed in China as early as 2500 B.C.
• England – 1500 A.D. carp culture was introduced
• U.S. – first fish hatchery was in Oregon 1877
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Aquaculture
Over the past three decades, aquaculture hasbecome the fastest growing food producingsector in the world. Aquaculture hasexpanded, diversified, intensified andadvanced technologically, and, as a result, itscontribution to aquatic food production hasalso increased significantly.
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Aquaculture and Seafood
Aquaculture is growing as a source of the world’s seafood supply.
Capture from the oceans is maximized.
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Aquaculture
Globally, more “food fish” is consumed on a percapita basis than any other type of meat oranimal proteinFish (16.0 kg per capita supply in 1998),Pork (14.9 kg in 1998),Poultry (10.1 kg in 1998),beef and veal (9.8 kg in 1998)
Sources: (Delgado et. al., 2003).
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Benefits of Aquaculture
Ability to bring fresh, or even live, seafood to market at a specific time and quantity.
US seafood market
Asian fresh seafood market
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0
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Plants
Fish
Molluscs
Aquaculture = emerging industry in Europe
FISHSTAT (March 2007)
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Current Aquaculture Production
• Aquaculture is the fastest growing sector of U.S. agriculture with an approximate annual growth rate of 10%
• Currently aquaculture accounts for 25% of all seafood consumed in the U.S.
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World Aquaculture Production
• In 2000 45.51 million metric tons by weight of aquaculture products
• Equal to US $56.47 billion
• China is the largest aquaculture producing country in the world
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Percent of Total Food Fish Supplied by Aquaculture
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Aquaculture Production, Ocean Fisheries, and Fishmeal Production
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Aquaculture
In Palestine, the entire consumption of animal proteinof the Palestinians is made up of almost chicken, sheepand beef with hardly any fish.
The average per capita monthly consumption in thePalestinian Territories, in terms of Jordanian dinar is:meat and poultry JD9, bread and cereals JD5,vegetables, legumes and tubers JD4, fruits and nutsJD3, dairy products and eggs JD3, sugar andconfectionery JD2, and fish and oil just JD1. Thisreflects the insignificant level of fish in their diet.
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Aquaculture in Palestine
Eating too much meat and poultry is an unhealthy nutrition.
Meat and poultry are high in cholesterol resulting in higher bloodcholesterol.
High cholesterol increases the risk of coronary heart disease weakeningthe heart and making it less efficient.
The risk among Palestinians is compounded with other factors, such assmoking and high blood pressure. Fish has very little, if any, dietarycholesterol. Indeed, a survey carried out by the Israel Ministry of Healthhas shown that Palestinians living in East Jerusalem have much highercoronary heart disease mortality than Jews living in Jerusalem (Kark J.,2000). A primary contributing factor is the dietary habitats of thePalestinians. Palestinians are not eating fish.
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• Aquaculture in the Palestinian authority region• The political factors, combined with environmental, economic and
infrastructural barriers resulted in a sharp decline in the fishery catch and adeficit in fish supply of the Mediterranean.
• The fishery catch dropped dramatically from over 3,700 metric tons in 1970to less than 510 metric tons in 1991 (FAO).
• After May 1994, the fishing zone was expanded and several internationally,funded projects to enhance the fishery sector are currently in the GazaStrip. However, in view of the current trend of industrialization in the area,the increased pollution of the Gaza Strip coastal area and degradation ofthe marine environment marine fish quality will certainly deteriorate andthreaten the safety of the consumer. In addition, the fishery catch, as oftoday, is not enough to satisfy the local demand for fish.
• Introducing Aquaculture to the Palestine Authority seems vital to overcomethe shortage of fish supply. Several other reasons justify the preference ofaquaculture over fishery in the PA.
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Why Aquaculture Products?
• U.S. or locally grown (Exclusive Economic Zones)
• Control: Food fed, Density, Quality of product
• Sustainable in the face of Finite Resources—overfishing and habitat destruction antangonists
• Diversify farm income
• Proximity—Farms may be closer to local markets.
• Fuel Cost $$$
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Why Aquaculture Products?
• Health Consciousness (protein, FA’s, micronutrients)
-2 fish meals/week decreases mortality from heart problems 50%
-Omega-3 fatty acids decreases occurrence of heart disease (oily marine fish – Salmon)
• American Cancer Association– -Regular fish consumption decreases chances of colon cancer 50%
• Efficiency of growth
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Feed Conversion (grain:flesh) feed conversion rate, or feed conversion efficiency (FCE), is a measure of an animal's efficiency in converting feed mass into increased body mass.
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Feed Conversion (grain:flesh)
• Beef cattle on feedlot 8:1
• Swine 3.3:1
• Poultry 2.25:1
• Rainbow trout 1.5:1
• Tilapia 1.25:1
• fish are so efficient!
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• Increased production beyond the natural sustainablefishery yield for a given water volume.
• Less fluctuation and shortfalls in catch due toseasonability
• Better production efficiency of fish protein andenhancement of fish quality.
• Improved water quality for irrigation purposes whenintegrated with the existing irritation systems andutilization water bodies unsuitable for domestic oragricultural purposes.
• Good use of the brackish water that is found in manylocations in the (west Bank region).
Why Aquaculture Products?
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Aquaculture is based on water
The key to the successful culture of aquatic organisms is maintenance of water quality.
Poor water quality = poor harvest.
Fish ponds in China
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To a great extent water quality determines the success or failure of a fish farming operation
WATER IN AQUACULTURE SYSTEMS
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Source
From where?
underground
surface
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Wells• Types
–
–
• Advantages– no predators– no pathogens
• Disadvantages–
– low O2
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Springs
• Advantages
–
– few or no predators
– no pathogens
• Disadvantages
–
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Rivers, Lakes and Streams
• Advantages
– large volumes
– inexpensive
• Disadvantages
–
– excessive nutrients
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Surface
• Advantages
– inexpensive
• Disadvantages
– contaminates
–
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Municipal
• Advantages–
– no predators–
• Disadvantages– disinfectants
•
• chloramines–
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Properties of Water
Aqueous Terrestrial
• Oxygen 0-14 mg/L 21%
• Temperature + 10˚C + 40˚C
• Density Variable (4˚C) Constant
• Composition Variable* Constant
*“Universal Solvent”
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Dissolved Oxygen
• Importance
– highest cause of mortality
• Solubility
– variables
• Safe levels
– > 5mg/l
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Testing Water Quality
Water quality parameters
often tested are:
Dissolved oxygen
Water temperature
pH
Total Ammonia Nitrogen
Nitrite/Nitrate
Alkalinity/Hardness
Salinity
Water test kit
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Water Aeration
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Water Quality
During culture
Turbid water
Clear water
Fertile water
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NITRIFICATION /
DENITRIFICATION
NO3- N2NO2
- NO N2O
NH3/NH4+ NO3
-+ O2
NO2-
Nitrification:
Denitrification (Anaerobic processes):
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Nitrification
NO3-NH3
1½ O2
nitrosomonas nitrobacter
1½ O2
NO2-
• Requires 3 moles oxygen to convert one mole of ammonia to nitrate
•
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Biofilters
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0.8
0.6
0.4
0.2
0.02 6 10 14 18 22
8
6
4
2
0
Ammonia(mg/l)
Nitrites &Nitrates(mg/l)
NHNO
NO
23
3
Time in Days
Time Requiredfor Bio-Filter to Mature
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Factors that influence water quality
Photosynthesis/Respiration
Water temperature
Fertilization
Feeds
Aeration
Water exchange
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Fish perform allbodily functions in water
• Eat
• Breathe
• Take in and lose salts
WATER IN AQUACULTURE SYSTEMS
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Water Balance in Freshwater Fish
Salts
Large quantitiesof dilute urine
Ammonia
Water
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Water Balance in Saltwater Fish
Small quantities ofconcentrated urine
Ammonia
Water
Drinkssea water
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Water Resources
• Water quality
• Water quantity
• Water sources
Inadequate water quality causes more losses than any
other problem!
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Uniform dissolved O in pond2
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Decomposingmaterials
Low dissolvedoxygen (cool)
High dissolvedoxygen (warm)
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Low dissolved oxygen -possible fish kill
TurnoverTurnover
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Relationships
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Pre-Use treatmentSterilization
• Ultraviolet –•• Chlorination-de-chlorination –•
Temperature control• Heating • Chilling
WATER IN AQUACULTURE SYSTEMS
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Water utilization• Open water systems
• Flow-through -Water enters pond or series of ponds and exits with/without treatment
-
-
WATER IN AQUACULTURE SYSTEMS
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WATER IN AQUACULTURE SYSTEMS
• Ponds
• Raceways
• Cages
• Recirculating aquaculture systems
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Ponds
• Minimum requirement
– to replace evaporation
–
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Raceways
• Minimum requirement
– 500 gal/min. or 1900L/min
• Rational
–
–
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Recirculating Aquaculture Systems
• Minimum requirement– varies depending on size of
system–
• Rational– needed to backflush filtersduring harvesting–
–
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Aquaculture Classified
• Intensive Aquaculture: Highly controlled, high density, RAS, raceways, confined (industrialized)
•Extensive Aquaculture: Minimal control,
lower density, ponds, third world
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World Aquaculture
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Proportion of Total Aquaculture Production for Different Taxonomic Groups
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Commonly Cultured Fish
• Foodfish
– Many species
• Ornamental fish
– Aquaria
– Backyard ponds
• Bait fish
– Minnows
– Shiners
– Goldfish (carp)
• Natural stock enhancement
– Salmon
– Trout
– Black sea bass
– Red Drum
– Many others…
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Commonly Cultured Crustaceans
• Marine (Penaeid) shrimp
• Freshwater shrimp (prawns)
• Crabs
• Crayfish
• Lobsters
• Brine Shrimp
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Commonly Cultured Molluscs
• Clams
• Oysters
• Mussels
• Abalone (Sea snails
• Urchins
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Catfish
Catfish have widely been caught and farmed forfood for hundreds of years in Africa, Asia,Europe, and North America. Judgments as to thequality and flavor vary, with some food criticsconsidering catfish as being excellent food, whileothers dismiss them as watery and lacking inflavor.
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Tilapia- an important species in aquaculture
• During recent years, tilapiine fish have become one of the mostcommercially important groups of freshwater fish in world aquaculture.They are indigenous to African countries but their distribution haswidened as a result of artificial introduction to more than 100 tropical andsubtropical countries.
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Tilapia- an important species in aquaculture
Tilapia are highly suitable for aquaculture because of several physiological attributes: • they have high growth potential• they tolerate a variety of environmental conditions and can
adapt to wide ranges of salinity, oxygen tension, and overcrowding (Watanabe et al., 1985)
• they exhibit relatively short reproductive cycles and breed prolifically under culture conditions (Coward and Bromage, 2000)
• they are strongly resistant to disease and infection.• they are acquiescent to handling (Rothbard et al., 1983).• they are highly valued by humans as food and have a large
international market (Coward and Bromage, 2000).
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• Tilapia- an important species in aquaculture
• Culture of tilapia has progressed swiftly during recent years,particularly in Thailand, Taiwan, the Philippines and China.Currently, tilapia are the third most cultured fish after carp andsalmonids, but according to a report of the American TilapiaAssociation they will become the most important aquaculture fishthis century. Total harvest figures for tilapia grew from 515,000tones in 1984 to 1.5 million tons in 2002, mostly as a result ofaquaculture expansion. Total production of fish from aquaculturewill have to increase by about 1 million tons a year (from the 2001level of 37.5 million tones to 53.6 million tones) until the year 2020to supply the human food fish demand of 127.8 millions (Delgado etal., 2003).Tilapia consumption has been rapidly increasing in manycountries e.g. since 1995 annual retail sales of tilapia haveconsistently surpassed those of trout in the USA.
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• Tilapia- an important species in aquaculture
• Optimization of hatchery efficiency is of greatimportance if production is to be maximizedand maintained. Scarcity of water has alwaysbeen the dominant factor in agriculture, as ithas been throughout most of the arid MiddleEast. There is thus a necessity to maximize theefficiency of water utilization in the cultureprocess, meaning as much purification andrecirculation of water as possible.
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Carp Culture
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Carp Aquaculture
• Possibly the oldest form of aquaculture in the known world.
• Currently the largest (2/3 of ALL fish production is carp)
• Three key species:
– Grass Carp
– Silver Carp
– Bighead carp
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Grass Carp
Silver Carp
Bighead carp
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Introduction
• Why carp?
• Eat low on the food chain.
• Tolerate poor water quality
• Adapt to both alkaline and acidic water!
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Broodfish• Broodfish should be selected at 2-4 years of age.
• Grown in ponds up to 1 to 10 acres (0.4 to 4 ha).
• Stock males and females at 1:1 or 2:3
• Preferred Temperature 77°F.
• Hormone injection (hCG) can be used to induce ovulation.
• Expect ~250,00 eggs/quart of liquid during incubation.
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Culture Methods
• Overall carp culture is similar to other warm water fish culture.
• Fry will go through a “green water” stage
• Densities of >500,000 fry/a (1.25 million/ha) are possible!
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Feeding
• Grass carp: can be reared on plants alone, but also perform well on pellets.
• Bighead are eat detritus and zooplankton in the wild, but also take to pellets!
• Silver carp are primarily planktonivores.
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Feeding
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Yield?
• Carp ponds often yield 2000-5000 lbs./acre
1 lbs. = 0.45359237 kg
One international acre is defined as 4046.8564224 square metres
• Often sold live or whole on ice.
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?
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More on carp...
• Grass carp are a member of the Order Cypriniformes and Family Cyprinidae. Cyprinidae is the largest family of freshwater fish species and includes all the minnows and carps.
• Grass carp: Native to Asian rivers, but stocked widely across the US.
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Eggs/Fertilization/Hatching
• Grass carp spawn naturally only in rivers with high water flows and appropriate temperature.
• Pond spawning does not take place.
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Feeding/Growth
• Grass carp consume vegetation intermittently at temperatures as low as 37 oF (3 oC).
• They eat steadily at 50 to 60 oF (10 to16 oC), with optimal consumption at temperatures between 70 and 86 oF (21 and 30 oC).
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Additional Cultured Organisms• Seaweed
– Food for Abalone
– Extraction of nutrients for vitamins
• Corals / Sponges / Sea Fans
– Extraction of medicines
– Aquarium trade• Live rock
– Aquarium trade
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THE PRACTICE OF SUSTAINABLE AQUACULTURE
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PROPER LAND USE
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WATER USE, CONSERVATION, AND REUSE
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FEEDING EFFICIENCY
• Animal protein is more expensive than plant protein
• Select species “low in the food chain”
• Polyculture systems use feed more efficiently
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ENERGY EFFICIENCY
• Ideal energy source for aquaculture is the sun (warm the water, energy for photosynthesis)
• Cages and pens can reduce energy required for harvesting
• Greenhouses can be used to extend growing season
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Collection and concentration of
suspended particles (mostly OM)
Sludge
Physico-chemical
processes
Particulate
organic
matter
SAPROPHAGOUS PATHWAY
Fungi
Worms
Microfauna
Bacteria
DenitrificationNitrification
NO3-NH3/NH4
+
NO3- N2
Sea cucumber
Ahlgren, 1998
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HERBIVORY PATHWAY
Microalgae
Cyanobacteria Macroalgae
Biomass (growth)
Nutrient
CO2
For harvest
and sale
Food source for
other organisms
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CASE STUDY:« RECIRCULATING SYSTEMS »
Arbiv & Van Rijn, 1995
« fresh » water
(3m3/day)
Sedimentation pond
and mechanical
filtration systems
Carps
Biofiltration
bacteria
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CASE STUDY:« RECIRCULATING SYSTEMS »
Twarowska et al., 1997
« fresh » water = 7%
of the system volume
Tilapia
Sedimentation pond
and mechanical
filtration systems
18% of feed
volatile
solids inputBiofiltration
bacteria
65% of mean TAN
concentration
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INTEGRATED AQUACULTURE
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Traditional vs. Integrated Multi-
tropic Aquaculture of Gracilaria
chilensis60% salmanoid feed stays in water
Gracilaria chilensis (seaweed) removes amonia
and nitrates from waterhttp://www.texasaquaculture.org/
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Integrated aquaculture = raising fish with another
crop
http://land.allears.net/blogs/jackspence/LWTL32.jpg
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Traditional vs. Integrated Multi-
tropic Aquaculture of Gracilaria
chilensis
Study examines potential of seaweed to filter
excess nutrients from salmon farms
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CASE STUDY: « INTEGRATED AQUACULTURE SYSTEMS »
GENESIS, 2001-2004
Sea bass
Nutrients POM
LightOysters
High-value products
Time-dynamic
culture
High-
management
demands
Diatoms
+ Si
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CASE STUDY: « INTEGRATED AQUACULTURE SYSTEMS »
SEAPURA, 2001-2004
Palmaria
Gracilaria
Porphyra
Chondrus
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CASE STUDY: « INTEGRATED AQUACULTURE SYSTEMS »
SeaOr Marine farm: Shpigel et al., 1993; Neori et al., 2000; 2004
3 kgFeed
LightUlva lactuca
Oysters
Microalgae
Wastes POM and dissolved
matter returned back to the sea = 4,25% of TAN
Settling faeces = 32,8% of TAN
1 kg
7,8 kg
3 kg
Retention = 63% of TAN
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NEW DEFINITION OF
INTEGRATION
Several organisms with different trophic pathways
Mutual benefits achieved ecologically
Conversion into biomass (≠ dilution)
Production of each organisms optimized
Aims of ‘bio-diversification’:
To reduce environmental impacts of aquaculture activity
To increase the commercial value of the system
Proper integration = Water re-used
Integrated recirculating aquaculture
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Herbivory
conversion
Detrivorous
conversion
AbaloneOysters
Microalgae Macroalgae
OVERALL NUTRIENT BALANCE
40-70% feed N
10-55% feed P
5-25% feed N
25-45% feed P
50-80% feed N
35-85% feed PWASTES
Bacteria Worms
BIOMASS CONVERSION =
7% feed N and 6% feed P
Bacteria
BIOMASS CONVERSION =
4-15% feed N and 25-45% feed P Schneider et al., 2005
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UNSOLVED PROBLEMS
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Farmer pond
Pictures of Current aquaculture practice
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Integrated with horticulture
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Integration with Rice
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Integration with chicken
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Farmer’s pond
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Fish seed collection from wild
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ORGANIC AQUACULTURE
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ORGANIC AQUACULTURE
• Organic aquaculture is the production of aquacropswithout “off-farm” inputs
• Aquacrops cannot receive any therapeutic chemicals or feed additives
• Genetic engineering and cloning are not allowed
• No discharge of wastewater into the natural environment
• Outside contaminants must be kept from the water supply
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ENVIRONMENTAL IMPACT OF AQUACULTURE