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![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/72/Rhodeus_sericeus.jpg/80px-Rhodeus_sericeus.jpg)
The bitterling, a small fish of the carp family, parasitizes freshwater mussels by laying eggs inside them.
The bitterling, a small fish of the carp family, parasitizes freshwater mussels by laying eggs inside them.