about-who-isabout-oysterabout-whereabout-farming

 

farming-banner

Most Australian oysters begin life in a hatchery environment before being grown out in trays, baskets and rafts. Pacific Oysters, some Sydney Rock Oysters and Angasi Oysters are grown this way. It has enabled growers to take advantage of advances in selective breeding. Much of Sydney Rock Oyster production relies on an abundant natural spat fall on to sticks or slats which is then grown out in trays, baskets and rafts.

The infrastructure used is mostly found in the intertidal zone of South Australia, Tasmania & NSW coastal waters; where oysters are exposed at low tide. A series of posts either support lines, from which baskets are suspended, or racking for trays. The grower will often chose a culture type suited to the local growing conditions and/or the target market. Some production is also found in the subtidal zone where baskets and trays of oysters are suspended from rafts or pontoons into deeper water.

Oysters are handled a number of times in their lifetime. Handling is for grading oysters by size as they grow, to remove dead stock or to reduce oyster spatfall (catch) and infestation from other species. This usually occurs by mechanical means to allow higher processing volumes at least cost. Again, the equipment used varies by farming method. Grading by tumbler or sieve is the most commonly used followed by specialist digital machinery.

There are a number of diseases and environmental conditions that can increase stock mortality rates but have no affect on human safety. These include QX disease (Marteilia sydneyi) and winter mortality (Bonamia roughleyi) in Qld and NSW, summer mortality in SA. Combinations of adverse environmental conditions have also killed large populations across the states.

hatcheryHATCHERY
Most Australian oysters begin life in a hatchery environment before being grown out in trays, baskets and rafts.

spatSPAT
If oysters don't come from a hatchery, they are caught naturally. Natural spat fall on to sticks or slats which is then grown out in trays, baskets and rafts.

handlingHANDLING
Grading by tumbler or sieve is the most commonly used followed by specialist digital machinery.

a-life-videoA life Video
Visit an Oyster Farm