Study of Fishery Building Capacity in Sutami-Lahor Reservoir

Abstract

Sutami and Lahor reservoirs are man made reservoirs in East Java Province, Indonesia with multiple functions: flood control, irrigation, power plant, tourism and aquaculture. Based on measurement in 2014, the storage volume of Sutami and Lahor reservoirs were approximately 158,600,000 m3 and 29,060,000 m3 respectively. Fishery activities with floating net, trawl, and fishnet separator in Sutami and Lahor reservoirs held by society living nearby the reservoirs. Those activities produce wastes that create higher pollutant load in the reservoirs. Study of fishery load capacity in Sutami and Lahor reservoirs was conducted using chlorophyll-a method and intended to preserve the sustainable benefits of reservoir water resources. Measurement and steps to determine the fishery potential in Sutami reservoir started with the calculation of chlorophyll-a concentration in unit area (mg/m2), calculation of primary productivity through Beveridge Equation, unit value adjustment of result primary productivity with unit value of primary productivity in Beveridge Table, calculation of conversion result from productivity primary value to fish weight, and calculation of fish production based on width of Sutami reservoir. The right system to manage fisheries is sowing fishing with zoning system, which means dividing the territorial waters of the reservoir surface based on their physical and biological to organize the reservoir fisheries pattern based on reservoir priority function. The results showed the average potential of fishery in Sutami reservoir in range of 73.18 - 166.85 tons/year and 10.70 - 16.64 ton/year in Lahor reservoir. Keywords: Chlorophyll-a, Fishery, Sutami-Lahor Reservoirs, Zoning.