Finding Dory and saving the seas

It looks like "Finding Dory" is a whale of a hit.  Great news for a warm, funny family film, not so good for the real fish.  Conservationists fear a repeat of the zoom in demand for clownfish 13 years ago, which basically wiped out some local populations.  Saltwater aquarium owners are being warned that blue tang are hard to keep healthy and are not a hardy species: people are asked to make sure their Dorys are captive-bred.

Danger for the Blue Tang

Regal blue tang (copyright unknown)