Marine animal is important part of environment and local folk lore, but fishing communities hunt them for great profit
Mayor says this year's theme is peace and reconciliation
Youssou Ndour brings own version of talent show 'American Idol' to Dakar
Government spends $1 per prisoner, sum among lowest in world
Super Vegetable Gardens addressing issues of food security, poverty, climate change
But cities don't often have viable work alternatives for these migrants
