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oyster on river bed

Native Oyster Ostrea edulis

The native oyster Ostrea edulis has an oval or pear-shaped shell with a rough, scaly surface. The two halves (valves) of the shell are different shapes. The left valve is concave and fixed to the substratum, the right being flat and sitting inside the left. The shell is off-white, yellowish or cream in colour with light brown or bluish concentric bands on the right valve. Image: Hans Hillewaert (Flickr).

Find out more: iNaturalist, Marine Life Information Network