2019/01/12 · If Thailand and China are added, I shall run out of numbers. As the example, this is solely the White legged Shrimp industry in Vietnam-. 97,000 hectares of White Legged Shrimp (WLS) total farmed area. 427,000 metric tonnes of WLS per annum in 2017. WLS are worth US$ 2.5 billion per annum. Forecast growth of 29% in 2018.