How do you perk up a lonely fish? This may sound like the start of a particularly silly joke, but it was a very real ...

researchers noticed several instances of deep-sea fish seemingly swimming backward. Were they seeing that right? For years, scientists assumed that, “in the darkness and relatively featureless ...

Note – a larger tank (at least 20 gallons) is often better for tropical fish, as it provides more swimming room and makes it easier to maintain stable water conditions. Make sure you position ...

An aquarium in Japan closed Dec. 1 for renovation work, much to the apparent dismay of a lone sunfish. It missed people and stopped eating.

Four zebrafish spent 43 days in orbit aboard the Tiangong space station, breaking records and advancing space biology. In ...