The ocean conservation film “An Ocean Mystery: The Missing Catch” will premiere on Earth Day, April 22, at the Smithsonian National Museum of Natural History at 6 p.m. and on the Smithsonian Channel at 8 p.m. or 11 p.m. ET/PT.

The film follows fisheries scientist Dr. Daniel Pauly as he investigates the amount of fish taken from the oceans and the speed at which this resource is declining.

The film calls on governments to take a better accounting of their fish stocks to avoid a global food catastrophe.