The focus of this study is upper Gulf off the mouth of the Chao Phraya River of Samut-prakarn province in Thailand. Chaopraya river is characterized by a major potential for material recycling and producer goods. This river is connected to a ocean inlet. source of the pollution is fossil oil release from the ship because Chaopraya river is main port city. Therefore, some of fuel oil might be contaminated to the river and also flow into gulf of Thailand mostly concentrated. Another source of pollution is the urban seawage from the city located adjacent to shores of river, and discharge from a number of small cities along it.
This study selected shrimp because shrimp is greatest importance to upper Gulf off the mouth of the Chao Phraya River . It is the major protein-yielding food source for the regional population