BBC News
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Oysters have been reintroduced to the Firth of Clyde as part of a restoration project to bring them back from the brink of extinction.
Some 1,300 native oysters have been suspended below pontoons in Largs Yacht Haven and Fairlie Quay Marina.
The native oyster (Ostrea edulis) is a marine bivalve mollusc found in Scotland mainly on the west and north coasts.
Populations have declined 95% since the 1800s.
The oysters have been impacted by pollution, climate change and shellfish harvesting.
This means the benefits that the native oyster provides to the ocean - including each oyster filtering 200 litres of water each day and acting as an important habitat for marine wildlife - have been lost.