This video from Ireland says about itself:
8 July 2016
Common roach fish in freshwater
Common roach are small fish with an average size of 35cm, but some of them grow a bit more with a length of between 45-50cm. The common roach has red fins and a bluish silvery body with a white belly. The common roach has a big red spot in the iris and above and beside the pupil. The common roach lives in freshwater but also brackish water.
The common roach eats plant material and benthic invertebrates and also plankton. The common roach are native to most of Europe and western Asia. The common roach inhabit rivers, ponds and lakes and man-made canals. The common roach belong to the Cyprinidae family.
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