National Geographic : 2005 Feb
bordering on collapse Killed by oxygen-depleted water, rotting tilapia carpet the sea in 1999, one of many die-offs that have decimated the sea's fish in recent years. Birds often share a similar fate. Avian botulism felled some 10,000 pelicans in 1996, bringing wide attention to the sea. Biologists now capture sick birds (below) for rehabil itation. A salt-covered car (opposite) shows another threat: Rising salinity may wipe out fish and the birds that eat them.