FRANCIS MUSAKA PILES of dead Nile perch have been washing up on the shore of Lake Victoria in Uganda for no obvious reason, threatening the livelihoods of the surrounding communities, locals said. Teddy Nagadya, a fishmonger in Kigungu, a shoreline village in Entebbe town, told Reuters the dead fish have induced panic. "We do not know why Nile Perch are dying yet all the other fish are not dying," she said. Uganda's ministry of agriculture and fisheries said on Sunday that hypoxia - "a usual phenomenon" - may have led to the fish deaths, although fishermen in the area told…