With mid-October behind us, the air in the mornings and evenings has become much colder.The ranchu goldfish and medaka I ...

It might seem like a fish needs a car like — well, like a fish needs a bicycle. But a new experiment suggests that fish actually make pretty good drivers. In the experiment, several goldfish learned ...

Currently, swimming in my home tank are an Arowana, a Polypterus, and a Datnoid.The tank is 120x60x45cm. I previously had ...

Goldfish are a common fish found in the wild, in pet stores, and in households worldwide. Since the 1600s, when these fish were initially introduced to the United States, they have become common ...

Goldfish are everywhere: in classrooms, home aquariums and backyard ponds. They’re seen as low-maintenance pets, even markers of childhood. But a new body of research warns that when these fish end up ...

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The little fish couldn't swim upright due to a bladder problem. He spent most of his time stuck upside down on, or near, the bottom of the tank. This made it hard to eat and the fish's side was ...

My favorite story I wrote in 2019 was about a research study that taught rats to drive, an activity that the rats appeared to enjoy. Today, we have another tale of lab animals getting behind the wheel ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. A video about a 23-year-old goldfish struggling to swim has gone viral ...

Koi fish are colorful patterned common carp that are now celebrated in annual koi shows and kept in ponds all over the world. Some are worth millions.