Fish are predators of spawn and tadpoles and even small fish can cause
problems by competing with tadpoles for food in the pond. For this
reason we advise that you don't introduce fish to your wildlife pond. If
you would like to keep fish as well then you will need to create a
separate pond.
Frogs and toads can also cause problems for fish. During the breeding
season male amphibians grab hold of anything that vaguely resembles a
female - including fish, other species and other males. Usually the fish
is released unharmed but occasionally, if it's held by the gills or for
a long period of time, it can die.
More information:
What is the best pond design for amphibians?
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