Native British pond fish

[Dogghound]

Yes I think the only fish that would naturally occur in a small pond in the UK would be perch, eel and stickleback. It is not natural for fish to exist in small ponds. Most natural small ponds are ephemeral wiping out any fish, this can be each year or once every 5 or 10 years, fish which do survive have several limiting factors such as limited oxygen, not enough depth to over winter, not enough food, to much exposure to predators etc. This results in very few natural fish colonisations of ponds. As has been said human introductions tend to be the key to fish being present in ponds. Although for the sake of a story I would add the whole lot im sure nobody will look to much into it.