It’s a well-known fact that Britain is a nation of animal lovers and is particularly obsessed with its wildlife. However, there is one group which often gets overlooked – our piscatorial friends the freshwater fish. Currently there are 54 species of freshwater fish swimming around the United Kingdom, including species like the mullet and flounder which, despite just visiting the estuarine parts of rivers, can be found surprisingly far up from the sea! Non-native species such as the wels catfish, which resembles a giant tadpole, and the topmouth gudgeon are also present in the UK. Despite the UK not suffering from the presence of non-native species as much as other countries such as Spain, the tiny topmouth gudgeon does still cause big problems by outcompeting native fish and spreading disease.
In recent years, the number of native European eels has declined by around 95%. However, 2013 was recorded as one of the best elver runs in recent years, with millions making their way up the Severn. Whilst many may think that floods are not good for fish, flooding helps the European eels get into ponds and lakes where they can grow before returning to the Sargasso Sea with the next floods.
There are many other native freshwater fish species which are less well known to the general public and even wildlife enthusiasts (I bet most birders in the UK have never heard of a spined loach or allis shad, for example). One such species is the Arctic charr, a cousin of the trout, which lives in deep glacial lakes mostly in the Lake District and Scottish Lochs. The Arctic charr can also be found in Iceland where it reaches much larger sizes of up to 20lb and, unlike the British populations, goes out to sea like a salmon.
So next time you’re walking by your local canal or river, take a look and see what you can spot - you’ll be surprised by the wealth of fish life beneath the waterline in British waterways.
Video showing 28 species filmed by me: http://www.youtube.com/watch?v=mjAIUKfYtHA
Jack Perks Photography – Underwater & Wildlife Photographer