It is a sad thing to think about. But 70somthing percent of the earth is water, these fish inhabit about 5 percent of it are over a million times more evolved then us humans are, Im sure over collection isnt going to be much of an issue. Even all the surveys are 95% done by someone riding around in a plane. Stuff like less algae or a mass predators maybe, only because somthing like that can drastically reduce the population and even then i dont see it much of a problem. The one thing i sorta do agree on with this short film, is the fish often arent kept for over 5 years, for them to be bounced around and you know where that leads too =/