SEAPA Pty Ltd. products

Developed in South Australia, The Adjustable Longline System gives the farmer the ability to have greater control over their stock. This is achieved by raising and lowering the line to different heights set on the posts during different seasons, environmental conditions, and stage in oysters growth. Farmers will lower the line if they need the oysters to grow at a faster rate, or for preparation of a storm event, and they will raise the oysters to control biofouling increasing the time the oysters are out of the water. A raised line also is set for oyster conditioning, as it has less time in the water and greater time in the wave impact zone which will rumble the oysters in the baskets keeping them clean and stunting shell growth.

Fixed systems involve the construction of metal frames, wooden racks, longlines set at a fixed height or other structures which are placed on the seabed in an intertidal range. Baskets are set through this installation allowing the oysters to open and feed when the tide is in. When the tide goes out, the oysters are exposed to the air which helps to manage biofouling and hardens the shell. Through the tide transition, the baskets enter the wave impact zone which promotes oyster rumbling. Floats can be attached to the baskets to help increase basket movement, in turn promoting the oysters to rumble in the baskets.