Oysters – Canaries of our Estuary

laurie-derwentLaurie Derwent spoke at our 24 October 2016 meeting on the rise, fall and eventual demise of the oyster industry along the Georges River.

The Derwent Family were involved in the oyster industry for the best part of 100 years. Lauries spoke from his personal experience as an oyster farmer in his youth and over 35 years experience working for various fisheries and maritime agencies until his retirement in 2013. During his lifetime, Laurie has seen the river change from an ideal oyster-growing environment to a “disaster”.


He spoke of the rich history of the estuarine areas around the Georges River – home of the world’s best oyster: Saccostrea glomerata (Sydney Rock Oyster).

He spoke of its cultivation from the early days in 1880’s: when stone was cut, and laid around the estuary to capture spat; and the rack method where oysters were suspended above the mud to avoid the mud worm.

As the production and the demand for oysters increased, this sustainable industry supported many farmers for generations. Then the troubles began with E. coli infection from water pollution; TBT (antifouling paint) influence on shellfish; introduction of rogue Pacific oyster; and the death knell itself – QX in 1994. This parasite ruined the oyster industry in the Georges River and the livelihood of many local farming families.

The humble oyster spends its entire life protected by its sharp shell feeding on the nutrient provided by the healthy River. But as our city continues to grow unabated, and our sewerage and drainage infrastructure buckles, our precious river engorges on a toxic cocktail and the humble oyster is stuck between a rock and a hard place.


neverfail-bay-oyster-lease-remnants Neverfail Bay Oyster Lease Remnants oysters-on-shell-bed Lime Kiln Bay Oyster Shell Bed tray-cultivation-oatley-pk Oatley Park Tray Bed Cultivation oyster-trays Pulling up Oyster Trays






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