▁ 4 ▁M W ▁capacity ▁hydro - elect ric ▁power ▁station , ▁which ▁is ▁now ▁operating . ▁ ▁Fish eries ▁The ▁non - ind igen ous ▁til ap ia ▁fish ▁was ▁introduced ▁here ▁in ▁the ▁ 1 9 5 0 s ▁and ▁subsequently ▁this ▁res er voir ▁had ▁highest ▁fish ▁yield ▁in ▁the ▁state ▁by ▁the ▁ 1 9 7 0 s . ▁T il ap ia ▁now ▁accounts ▁for ▁a ▁major ▁portion ▁of ▁the ▁catch ▁in ▁the ▁res er voir . ▁Cast ▁n ets ▁are ▁commonly ▁used ▁for ▁subs istence ▁fish ing . ▁Norm ally , ▁an ▁individual ▁fish erman ▁can ▁catch ▁more ▁than ▁ 2 0   kg / day ▁of ▁fish ▁in ▁the ▁res er voir . ▁ ▁The ▁Fish eries ▁department ▁normally ▁expects ▁a ▁yield ▁of ▁ 1 1 0 ▁t onnes / year ▁of ▁fish ▁from ▁the ▁res er voir . ▁In ▁ 1 9 7 2 , ▁a ▁fish ▁yield ▁of ▁ 1 6 8   kg / ha / yr ▁( 1 6 8   kg / yr ▁x ▁ 9 3 1 ▁ha ▁= ▁ 1 5 6 , 4 0 8   kg / yr . ▁= ▁ 1 5 6 . 4 0 8 ▁t onnes / yr .) ▁was ▁reported . ▁ ▁The ▁Fish eries ▁Department ▁has ▁formed ▁the ▁Am ar av ath i ▁Nag ar ▁Trib al ▁Fish erm en ▁Cooper ative ▁Society ▁to ▁give ▁trib als ▁fish ing ▁rights ▁in ▁the ▁Am ar av ath i ▁Res er voir .