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 challenge faced by staff at a Japanese aquarium when they noticed their sunfish ...

As a last-ditch measure to save the popular fish, its keepers hung their uniforms and set up human cutouts outside the tank. The next morning, the sunfish ate for the first time in about a week ...