Grow-out Method

Deployment Area

Equipment Required

Advantages

Disadvantages

Raft System Surface or Submersible

Deep water

Boat tender

Floating raft using one of these:

Oyster sticks, lantern cages, stacking Dark Sea Trays of Aquatech trays

Longer lasting and less maintenance than longlines

Stable work surface

Easily moved to changing site conditions

For maximum growout potential highest return on amortized investment

Totally under water more fouling occurs

Slightly higher capital cost

BST Aquaculture

Adjustable Long-line Method

Subtidal

Special Veclock long line

Wood pole pilings, riser clips, bag clips, Durethene Grow-out bags

Boat tender

Low labour

Mother Nature does most of the work - bio-fouling control, shell pruning, adjustable food supply, very efficient

Inexpensive

Cages have reinforced strands that give rigidity in height and depth and allows water circulation for feeding, UV stabilized, long lasting

Site specific

Longer initial set up time

Can not be used in major icing areas

Floating

Surface / Subsurface

Sub-tidal

Any deep water application

Especially designed for areas with ice in the winter

ADPI - OBC Cages

Lobster trap rings, Styrofoam SM, Black plastic cable ties, hog rings, longline-size dependent on number of bags, anchors, spreader bars or wood

Low-fouling

Can be used from nursery to full grow-out; for nursery fine mesh spat collection bags inside the OBC cage is used until optimal growth is achieved

In the winter in ice areas system can be easily submerged

Cages have reinforced strands that give rigidity in height and depth and allows water circulation for feeding, UV stabilized, long lasting

More rapid growth than other methods because of the increased food availability nearer the water surface

Easy to deploy and move

Inexpensive

Semi-labour intensive

Limited to quiet sites

Limited site efficiency

Subject to rough water

Harder to harvest

Bottom Culture

(Ranching)

Ocean floor

Boat and dragger

Uses existing equipment

Very little fouling control problems

labour intensive, predation exposure

High equipment cost

More susceptible to disease such as MSX and Dermo

French Method

Above ground racks

Tidal flats

Low tide out of water

Rebar Racks

ADPI - OBC or CBC cages

Hog rings

Bag pins

Tractor / ATV - trailer

Cages are reusable

Low tide the bags are out of the water less fouling occurs

Oyster are protected from predators, sinking, and wash outs

Cages have reinforced strands that give rigidity in height and depth and allows water circulation for feeding, UV stabilized, long lasting

No boats required can use ATV or small tractor with trailer for deployment and harvest

labour intensive

Oysters can not feed when out of water

Oyster is stressed when out of water

Slower grow-out compared to other methods

Modified French Method

Bottom Racking

Sub-tidal

Low-tide remain in water

Steel Bottom Racks

ADPI - OBC Cages

Hog Rings

bag pins

Boat Tender with Deployment / Harvest boom or crane

Cages are reusable

Oysters are protected from predators, sinking, and wash outs

Cages have reinforced strands that give rigidity in height and depth and allows water circulation for feeding, UV stabilized, long lasting

More rapid growth than above ground rack methods because of the increased food availability nearer the water surface

Cages and racks are always under water causes major fouling

labour intensive

Harder to work with them above ground racks

Site specific

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