Via the South China Morning Post: Tilapia, a fish to feed the world, and the deadly virus that may destroy it. Excerpt and then a comment:
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.
“It’s definitely alarming,” says Mohan Chadag, principal scientist (aquaculture) for World Fish, an international non-profit organisation that supports fishing and aquaculture research, and is headquartered in Penang, Malaysia.
The tilapia lake virus was discovered in Israel and Ecuador. It has since been reported in 12 other nations and regions, including many in Asia: Thailand (2015), Indonesia and India (2016), the Philippines, Malaysia and Taiwan (2017). Mexico reported its first cases in 2018.
Widely regarded as the “poor man’s fish”, tilapia grows quickly, and worldwide production is almost double that of Atlantic salmon. It has rapidly become a vital source of cheap protein for growing populations in the developing world as wild fish stocks dwindle.
About 42 per cent of all fish the world consumes is farmed, and that proportion is set to rise to more than 50 per cent within a decade, according to the UN Food and Agriculture Organisation.
Tilapia is key to this growth, and it’s not just poor nations that eat it – it’s the fourth most consumed fish in the United States.
Tilapia production is undertaken in 87 countries and it’s particularly big business in Asia, which produces more than 70 per cent of the total.
China, which so far has not reported a single outbreak of the killer virus, is the world’s top producer, at 1.8 million tonnes in 2016, according to the China Fishery Statistical Yearbook 2017, and has probably risen since. Other major producers include Indonesia, Egypt, Bangladesh, Vietnam, the Philippines, Brazil and Thailand.
I wrote about tilapia in The Tyee back in 2011, when it seemed to be a far better alternative for fish farms in British Columbia than Atlantic salmon; our fish farms have materially damaged the wild stock, but our politicians continue to support them.
At least as alarming is China's reliance on tilapia.
African swine fever is already panzootic across China, posing no direct threat to humans but killing almost every pig it infects. (See Mike Coston's
Avian Flu Diary for the details: he's recorded its horrifying spread province by province.)
If China runs short of protein, we all run short. China can buy what it needs elsewhere in the world, but that could deprive scores of nations around the world by pricing them out of the market, just as England imported tons of food from Ireland in the midst of the potato famine of the 1840s.
Food insecurity leads to political insecurity, which inevitably leads to war, population displacement, and yet another demonstration of the "advanced" nations' selfish refusal to be inconvenienced by others' needs.
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