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Since 1990 the brackish shrimp industry has been in development and now plays a vital role in Vietnam’s aquaculture sector. In the past 30 years, the brackish shrimp practice was remarkably thriving in both horizontal and vertical dimensions. The shrimp industry is more and more intensified: from extensive to super-intensive practices. The impressive results are thanks to changing technology, methodology and species that are compatible with the seasons, environmental conditions and market demand. There are many shrimp export companies, which have promoted shrimp products, accounting for an average of 43.9% of total aquaculture exports in recent years. During the recent years, the related authorities supported shrimp farmers through training courses where they can learn about environment fluctuation and diseases. However, an increase in density of stock and expanding area caused some uncontrollable problems such as disease outbreaks, polluted water resources and abuse of drugs and chemicals in shrimp practice. Overuse of drugs and chemicals is not only harmful to natural ecosystems but also affects customers’ health due to the residual ARTICLE INFO ABSTRACT Article History: Received: Jan. 5, 2021 Accepted: March 23, 2021 Online: April 30, 2021

Evaluating WTA (Willingness to Accept) a Subsidy for Getting a VietGAP Certificate in Shrimp Farming: A Case Study in Tra Vinh Province, Vietnam.