What is the fine-grained topic of the following text: Vietnam’s shipment value of shrimp to the U.S. during January-May reached $249.3 million, rising 17.4 percent from the same period in 2015, according to data from Vietnam Association of Seafood Exporters and Producers (VASEP). Only return the topic.
Vietnam's shrimp export growth to the U.S. in January-May compared to the same period in 2015.