A pet owner trained his pet fish to respond to the dinner bell ringing. Amusing footage shows how the little koi fish ...

If you see a lone tetra hanging by the side of the tank or swimming on its own outside the group, it is likely sick or injured. Just as you might suspect, your pet fish may be feeling unwell if it ...

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 ...