Preparation of project stories Studies on the growth of the fungus in Rhodopseudomonas sp, fresh water and salt water. The objective is to study the growth of pathogens. Rhodopseudomonas sp., in fresh water and salt water to be used in the field of agriculture and fisheries, the most benefit. By studying and comparing the Infections for 30 days by Rhodopseudomonas sp. culture and sampling every 3 days, and then bring the dry cell weight comparison fungal growth. Rhodopseudomonas sp., in fresh water and salt water, which would cause the fuel to learn that Rhodopseudomonas sp thrive in fresh water or salt water is better.