May 6, 2019 — A small African fish called the tilapia may be vital for meeting the future food needs of humanity, according to scientists, but they are also concerned that a killer disease discovered in recent years could wipe out the species. That, they warn, would have devastating social and economic consequences for China and the rest of the Asia-Pacific region.
Although its name may not be widely known, the freshwater tilapia is second only to carp as the world’s most widely farmed fish, and China is the largest producer. With global production of farmed tilapia reaching 6.3 million tonnes in 2018 and an estimated market value of US$9.8 billion, the little fish is big business. That’s because it is an essential source of protein, revenue and employment in the developing world.
An advantage of farming tilapia was once its resistance to disease, which is a constant problem in intensive fish farming. But a new virus has caught the industry off guard. Tilapia lake virus, or Tilapia tilapinevirus, was identified in 2014.
Scientists know little more about it, except that it has a morbidity rate of up to 90 per cent, depending on the strain, and is highly contagious. The first indication of the virus on a fish farm is lots of dead tilapia.