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It is estimated that Water area of Limboto Lake will disappear before 2030. Groundwater is also decreasing. Those phenomena affect biological environment of lake. Lotus that perennial plant disappeared because water depth is falling 15cm/year and water hyacinth that brought by river multiply from around 2000. Those rapidly environmental change and fish farming from 1995 influenced that fishes are small and few than past. And flood is happen every rainy season. People who live around lake choice modern style house and filled 1m depth water flood. It is thought that their economic condition might relate to their choice. Fisher’s earning is approximately Rp.51-16million/year, farmer’s one is Rp.10-17million/year. Their income is not much at all. The possibility that their economic conditions worsen more is very high in situation of rapidly environmental change. It is necessary how to develop new sustainable work under the present conditions.

Prior Study for the Biology and Economic Condition as Rapidly Environmental Change of Limboto Lake in Gorontalo, Indonesia