Studies suggest that there may not be so many fish in the sea anymore, leaving aquaculture to be the best method to provide food for the growing population.
Cichlids, fishes from any of the 1,300 species under the family Cichlidae, are popular among casual collectors and scientists - with researchers like Jimena Golcher-Benavides focusing their work on these species.
A new study found that salmon returning to rivers in Alaska has grown drastically smaller in the past 60 years - and their time at sea appears to be the reason.