the disease, crop breeding process in order to avoid the damage caused by natural disasters. The awareness of farmers: FAO (2008) have shown that, in some cases, the lack of ability of aquaculture perceptions about aquaculture skill, protect and maintain the safety of water supplies and outdoor production aquaculture will lead to negative implications for productivity. Aquaculture habits according to traditional methods often powerful impact on the environment as inorganic chemical use too the dosage; after use, bottles, rubbish is processed and not throw away next to the indoor livestock, destruction of biodiversity. Well aware of this problem will minimize stress cultivation environment contamination, keep the safety for farming areas, thus limiting the risks of disease, increased productivity. Less environmental pollution level: aquaculture activities have two modes of the impact to the environment. First, that is how the aquaculture production directly affects the environment through the output, consume materials, inorganic chemicals. Second, is the method of aquaculture can indirectly influence to the natural environment, especially the intensive farming is only one type of animal or plant on the wide area, reduce the biodiversity, ecological imbalance, some biological community will be destroyed due to the loss of the food chain. The impact of disaster: the fisheries industry is one of the impact, especially the coastal aquaculture sector is heavily influenced from climate change. The manifestations of climate change, as rising temperatures, sea level rise, changes in rainfall and disasters have negative implications to aquaculture activities. Structure damage caused by natural disasters in the agricultural sector value average annual 781,764.11 million, accounting for 0.67% of the total GDP and accounts 54.03% compared to the total value of damage caused by all the agents of agricultural nghiệp5. Inorganic chemicals: in the study by Phillips, Michael (2000) have shown the use of organic fertilizers in raising carp fishery in shrimp and lime do not impact the harvest yield of two types. However, the use of antibiotics, vitamins and antibiotics, antibacterial as piscicides, chloramphenicol and malachite green has had a negative effect on the level of pollution of the water environment, land in farms, shrimp, fish. Although their effect is to kill the bacteria causing the disease for shrimp, fish and other creatures, but the toxicity of these chemicals are also
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