A small fossil reveals that the largest freshwater fish, Otophysans, emerged in the sea, not in rivers, changing the ...

No problem! From garden ponds filled with Koi Carp to the humble goldfish bowl (although, as we’ll find out later, goldfish need far more space than a bowl can offer) –Britain is a nation of fish ...

The colourful Neon Tetra is probably the world's most popular pet tropical fish, and for good reason. It's a peaceful fish ...