Thieves stole 10 Koi Carp from a garden in a Norfolk village earlier this month.
The fish were stolen from a house in Crown Road, Old Buckenham sometime between August 3 and August 6.
Police believe the fish were stolen during more than one incident. The water was found to be murky and fish scales were seen around the pond.
The Koi were imported to the UK from Japan and are not common to conventional UK sellers.
Anyone with information in relation to the incident should phone PC Kate Waton quoting crime number CR35540/12 on 101, or Crimestoppers anonymously on 0800 555111.
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