Molluscan Aquaculture in Atlantic Canada. Need for Aquaculture The need for food around the world is...
Transcript of Molluscan Aquaculture in Atlantic Canada. Need for Aquaculture The need for food around the world is...
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Molluscan AquacultureMolluscan Aquacultureinin
Atlantic CanadaAtlantic Canada
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Need for Aquaculture
• The need for food around the world is always increasing
• Fish stocks are declining - New resources need to be developed
• Growing and caring for aquatic organisms for the purpose of food production
» Salmon, Mussels, Oysters, Scallops, Trout, Arctic Char, Sea Urchins, Kelp, etc.
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Shellfish - Filter Feeding
• Filter feeding animals are very important in an ecosystem
• They eat what is already there - so they don’t need to be given artificial food
• They clean the water - most can even filter and eat bacteria, making them safe to consume
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This slide shows clumped mussels open and actively feeding
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GILLS
STOMACHINTESTINE
HEART
MANTLE
AMERICAN OYSTERANATOMY
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Condo with Oysters
Oyster Aquaculture
The cages are tied and floated in rows to feed on naturally occurring food
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Quahaug Aquaculture
Shows high densities in red areas
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Mussel Aquaculture
Lines from a distance
Closer to lines on a calm dayMature lines out of water
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Mussel Aquaculture
Support Line Buoy
Marker Buoy
Between 5 & 7 Metres deep
Anchor
Mussels Sock150 socks per line
BOTTOM
Suspended mussel line
90 meters
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SCUBA
Divers getting positioned
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SCUBALook at mussel lines
Look for starfish in divers hand
Click on middle frame
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SCUBA
This mussel line will be used for samples
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Research
• “Weather Station” use of cages
• Temperature/Salinity
• Water quality
• What are the conditions in the bay
• Growth / Survival
• Competition
• Invasive species
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1 m
DFO/AVC
Collecting portionTemperatureRecorder (1 min intervals)
Mussel Cage
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Experimental Mussel Cage on Site
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Growth
This mussel measures 4.95 centimeters
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Research
• Field studies– Deployment
of 50 cages in PEI, NS, and NB (Oysters and Mussels)
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Growth Rateµm/d
15050
How can there still be good growth in many areas that look crowded?
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Working with Aquatic Ecosystems
• Dynamic - Everything is in movement • Tides, currents, water exchange, etc.
• Interrelated - All the parts are connected• Impact on one part affects the others
• Influences - Many things affect the ecosystem• Water based factors - Constantly changing environment
• Land based factors - Most things eventually finish in the oceans
• Natural and Man-made impacts
• Other species
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Invasive species
Green Crab Clubbed Tunicate
Codium
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Mussel research cage covered in club tunicates
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Questions?
Marine Biology
Ecosystems
AquacultureScientific Research
Scuba Diving
Mussels
Crabs
Oysters
Lobsters
Invasive species Challenges
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Questions on any of the Topics Above ?
Contact
Or any DFO office in your area
Matthew HardyAquaculture Biologist Fisheries and Oceans CanadaGulf Region 343 Université AvenueMoncton, N.B. E1C 9B6Tel. (506) 851-2728
E-mail: [email protected]