FAO warns of lethal virus spreading among tilapia fish 

ROME, (Xinhua) — A highly contagious disease is spreading among farmed and wild tilapia, one of the world’s most important fish for human consumption, the UN Food and Agriculture Organization (FAO) said on Friday.
The Rome-based UN agency said the outbreak should be treated with concern, and countries importing tilapias should take appropriate risk-management measures, including intensifying diagnostics testing, enforcing health certificates, deploying quarantine measures and developing contingency plans. According to a Special Alert released by FAO’s Global Information and Early Warnings System (GIEWS), Tilapia Lake Virus (TiLV) has now been confirmed in five countries on three continents: Colombia, Ecuador, Egypt, Israel and Thailand. While the pathogen poses no public health concern, it can decimate infected tilapia population. In 2015, world tilapia production, from both aquaculture and capture, amounted to 6.4 million tons, with an estimated value of 9.8 billion U.S. dollars, and worldwide trade was valued at 1.8 billion dollars. The fish is a mainstay of global food security and nutrition, GIEWS said.
The FAO also said tilapia producing countries need to be vigilant, and should follow aquatic animal-health code protocols of the World Organisation for Animal Health (OIE) when trading tilapia. They should initiate an active surveillance program to determine the presence or absence of TiLV, the geographic extent of the infection and identify risk factors that may help contain it.  According to the food agency, actively TiLV surveillance is being conducted in China, India, Indonesia and it is planned to start in the Philippines. In Israel, an epidemiological retrospective survey is expected to determine factors influencing low survival rates and overall mortalities including relative importance of TiLV. In addition, a private company is currently working on the development of live attenuated vaccine for TiLV.  It is not currently known whether the disease can be transmitted via frozen tilapia products, but “it is likely that TiLV may have a wider distribution than is known today and its threat to tilapia farming at the global level is significant,” GIEWS said in its alert. FAO data show, China, Indonesia and Egypt are the three leading aquaculture producers of tilapia, a fish deemed to have great potential for expansion in sub-Saharan Africa.