D Kat wrote:
It is important to distinguish between a 'waterway' or any body of
water that leads into a natural habitat and an artificial pond that
has no natural input or output. If it is the local artificial
suburban pond, then if permission is granted, there should be no
issue. snippy

You simply wouldn't get permission......simple as that. The law here is very
strict on that account.

"It is an offence under the Wildlife and Countryside Act 1981 to release, or
allow to escape, any non-native animal to the wild in Great Britain except
under licence. The same offences apply in respect of certain non-indigenous
species, which have established resident populations in Britain and which
are listed in Schedule 9 of the Act."

The Signal Crayfish has decimated many rivers here, to the extent that
native varieties are in danger of disappearing. They have also badly damaged
the habitat of other river inhabitants.
--
Pete C
London UK