Abstrack:
Yogyakarta only has one artificial lake, which is Sermo reservoir. Sermo reservoir has many functions, among others, is to provide raw materials of drinking water, irrigation, agriculture, fisheries, and tourism. Sermo reservoir fisheries used to be very beneficial for the local people. After the emergence of invasive species, Red Devil, the yield of the fisheries declined dramatically. This study aims to assess the ecological threat of invasive fish species in Sermo reservoir and the potential economic value gained from local people of this fish. The information about ecological threat and economic value from this fish is assessed using indepth interview with local people and secondary data from other sources. The results indicating that fishery in Sermo were very beneficial for the local people in the past. Around 1995, Red Devil fish accidentally entered to the Sermo Reservoir and dominating the system. The Red Devil prey on other commercial fish. The impact of inclusion Red Devil fish in Sermo reservoir is the number of fish obtained by local people has declined. Red Devil fish is lucrative for sale, so the local people using this fish for feeding duck. In addition to the ecological threat caused by Red Devil fish, the fish was also bring economic benefits to the home industry of local people. Local people take advantage of this fish for making crispy-fried fish. These efforts have constraints in marketing. Therefore the role of government is necessary in helping the home industry in order to optimize profits for local people.
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