sentences:  The mangrove systems on the eastern margins are areas of high primary productivity feeding and restocking both the Gulf and the nearby Ningaloo Reef.A proposal for a system of solar salt evaporation ponds stretching more than along the gulf's south-western coast has given rise to heated debate on possible environmental impacts on the area.The Gulf and off-shore waters beyond the Ningaloo fringing reef are home to some of Australia's more significant sport fish including marlin, Spanish mackerel, and several sub-species of tuna.