I am 100% confident nothing like this has ever been added, the closest being a golden tench. This leads me to assume that it may have been added whilst it was an egg either by frog or bird. Also ten years ago pond weed was added from a nearby mill pond but does anyone know of them being found in such places? Any possible answers would be appreciated to tame my confusion
Yes, it is possible to transport fish on pond weeds as either eggs (most likely) or as baby fish (weeds would most likely be transported in some water). Here is a link to the species list here at Loaches to the fish found in many places in Europe, and a link to the very similar Cobitis. You can check the other species of Misgurnus and related species such as Cobitis to see if they might be your fish.
https://www.loaches.com/species-index/m ... s-fossilis
Here is a link to Fish Base that includes a lot more of the genus Misgurnis. You can do more research to see if any of these are found in your area.
http://www.fishbase.org/Nomenclature/Sc ... chList.php?
Note also that careless aquarium or pond keepers can allow fish to escape either accidentally or on purpose so that fish not native to your area may survive and even breed in areas that suit them.
Happy fish keeping!
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