Djibouti's most significant environmental problems are deforestation, desertification, water pollution, and the protection of its wildlife. Djibouti's forests are threatened by agriculture and the use of wood for fuel. The rare trees on Mt. Goda are protected within a national park. The water supply is threatened by increasing salinity. Underwater reserves have been established in the Gulf of Tadjoura to prevent overfishing of tuna, barracuda, grouper, and other species. As of the mid-1990s, six of 22 mammal species and three of 311 bird species were endangered. Three of the nation's 534 plant species were also threatened with extinction. No hunting of wild animals is permitted, but abuses continue.