Two Kenyan fishers land their canoe on the edge of Lake Naivasha, tipping their silver catch on the grass under the eager eyes of their employer. The meagre haul of 20 bass - worth 800 shillings ($10) - is a far cry from what fishers working for Stanley Mungai would have netted a few years back. Mungai, like many living near the shore, blames the environmental impact of 30 or so flower farms that have been set up around the lake in the past decade.