Fishermen sit inside a wooden fishing boat in the Mauritanian port city of Nouadhibou, March 12, 2006. Mauritania's shores, where the Sahara meets the Atlantic ocean, are home to one of the world's largest concentrations of fish, crustaceans and molluscs, as well as hammerhead and tiger sharks, dolphins, turtles and rays. Despite its natural wealth and population of just three million, the Islamic Republic, which straddles Arab and black West Africa, is one of the world's poorest nations. To match feature MAURITANIA FISHING REUTERS/Juan Medina