You have to introduce it, and that's where a lot of goldfish owners slip up because you can't just buy a fish the same day you get your tank. The process of growing bacteria takes patience.

Fancy goldfish in particular are frequently afflicted ... by the way): Always wash your hands well after touching fish or aquarium water. Wear latex gloves when handling fish (you may have noticed ...

Scientists have decoded the secrets behind a goldfish's ability to survive in ice-covered lakes. They've worked out how and why the fish turn lactic acid in their bodies into alcohol, as a means ...

Tropical fish are a colourful addition to many households, but they may not be as innocent as they appear. They could contribute up to 12.4% of the UK's annual average household CO2 emissions and ...