Various furniture may be used to accommodate the oysters, including trays suspended on buoys or pyramid-like structures with horizontal trays.Īn advantage of this system is that the oysters are able to feed uninterrupted. Oysters are suspended in the water and remain below the water at all times. Rack and basket system: single seedīags of PVC mesh with two sticks running lengthwise through either end are suspended between a rack structure. Bags of any size can be made up to suit, depending on the size and quantity of oysters farmers wish to place in them. Bags can be removed or attached using stainless steel or plastic clips. You can quickly change the position of the line by adjusting the height of the intermediate posts.
#SEPRATING SINGLE OYSTER SPAT SERIES#
From this line, a series of PVC mesh bags are suspended with clips.
BST adjustable longline: single seedĪ line is tensioned between two anchoring posts with intermediate posts to keep it above the bottom. This maximises the water flow to each oyster in the tray and reduces the likelihood of the oyster being flipped over.Īs with the stick method, overspatting should be avoided by placing the trays in the water column above or below the optimum settlement region for spat. The tray is designed so that the height of the frame is equivalent to the height of one oyster only. The tops of the trays are usually covered with a wire mesh or netting, which you can remove to inspect the stock. The mesh size is determined by the size of the oyster. Tray culture uses wood, aluminium or plastic frames with bases of galvanised wire or plastic mesh.
This can be determined by simple experimentation. To avoid young oysters attaching to the crop (overspatting), you should place the sticks in the water column above or below the optimum levels for spat settlement. Moving the oysters from the sticks to an alternative method has advantages, as the oysters tend to reach a larger and more regular size. Sticks are spaced 15–20cm apart and then fixed to the racks.Ī disadvantage with this system is that if the oysters are not thinned out they will grow in clumps and produce smaller and irregular-shaped oysters. The sticks used for spat collection are separated and laid out more extensively onto the racks. This method involves keeping the sticks used for spat collection, removing excessive spat and leaving the remaining oysters to mature.
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