After second year of mass shark deaths in SF Bay scientists zero in on cause
Beginning in March, and for the second year in a row, hundreds of sharks have washed up dead or dying along the shores of the San Francisco Bay. Primarily the species that have been most affected are Leopard Sharks and Bat Rays. Mass elasmobranch die-offs have periodically been recorded in the San Francisco Bay since 1967, but scientists now think they are narrowing the possibility to one species of fungus that fatally infects the brains of these species.