Blackchin tilapia

The blackchin tilapia (Sarotherodon melanotheron) is a species of cichlid native to coastal west Africa. It is a paternal mouthbrooder which has been introduced to Asia and North America.

Quotes

 * The fisheries for this tilapia sustained lots of fish and they had a good time and they earned more than average in Ghana. When I went there 27 years later, the fish had shrunk to half of their size. They were maturing at five centimeters. They had been pushed genetically. There were still fishes. They were still kind of happy. And the fish also were happy to be there. So nothing has changed, but everything has changed.
 * Daniel Pauly, The ocean's shifting baseline (April 2010) Ted