"We started finding mud crabs in the rings, drawn by the reef," says Chowdhury. "Mud crabs have immense export value. 1kg can be sold for $10 [£7.30]. Two to three families can easily make a livelihood off a small oyster reef by adding traps," Chowdhury says. Other species the research team found included barnacles, sea anemones, gastropods and polychaetes (marine worms) – all of which can attract fish.

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