Without its usual crowd of spectators, Kaikyokan’s sunfish essentially started to fall into a deep-sea depression.

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 ...

Staff members believe the sunfish stopped eating when the aquarium was temporarily closed because it was lonely.

Fish have feelings too – at least if a lonesome sunfish in a Japanese aquarium is anything to go by. Animal caretakers at the ...