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Two of the main threats to goldfish kept outdoors are herons and otters. In mid May 2022, one of the Bristol Aquarists' Society's breeders suffered a devastating raid by otters on his outdoor ponds where he overwinters and brings on fish, in Bristol. Fishkeepers are used to the threat from herons, but remember to consider the threat from otters as well.
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Outdoor rearing trough (left) before countermeasures against otters, and wire mesh screens being prepared (right).
Vertical barriers
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Hinged wire mesh screens