8 May 2014 Last updated at 21:57
More than 1,000 native white-clawed crayfish have been released into a river in Powys in a bid to "save the species from extinction".
Natural Resources Wales (NRW) has reared and released over 2,700 captive reared crayfish into the wild in the last three years.
The latest juvenile batch were released in a river tributary near Builth Wells.
Native crayfish numbers have been affected by non-native American signal crayfish and pollution, say officials.
They have been released into specially selected "ark" sites on a tributary of the River Irfon after being reared at NRW's Fish Culture Unit with help from local ecology charity the Wye and Usk Foundation.
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