IN SAN FRANCISCO BAY.

JUST TODAY: THIS LARGE LEOPARD SHARK BEACHED ITSELF IN BURLINGAME.

NEAR THE COYOTE POINT RECREATION AREA.

SO — WHAT'S CAUSING THEM TO COME ASHORE? KPIX 5'S EMILY TURNER IS LOOKING AT THE SHARK DIE- OFF.

FROM TIBURON, WHICH — OF COURSE — IS SPANISH FOR SHARK.

EMILY: SCRAMBLING TO FIGURE OUT WHY.

TAKE QUICK SOT "ought to FIGURE OUT WHY.

TAKE QUICK SOT "ought to completely be involved.

" (MAP)THE CONCENTRATION OF DEAD LEOPARD SHARKS IS AROUND THE FOSTER CITY – REDWOOD SHORES AREA, ALTHOUGH NUMEROUS OTHERS HAVE WASHED UP IN ALAMEDA-MARIN- AND SAN FRANCISCO nats SEAN VAN SOMMERAN AND THE PELAGIC SHARK RESEARCH FOUNDATION HAS BEEN FOLLOWING THE SEVEN WEEK DIE-OFF.

TAKE SOT Sean Van Sommeran/pelagic shark analysis basis "its an issue as a result of.

THIS IS THE THIRD DIE OFF IN SIX YEARS.

CARREY WILCOX WITH THE RICHARDSON BAY AUDOBON SOCIETY REMEMBERS THE ONE IN 2011.

TAKE SOT kerry wilcox/richardson bay audubon society "sometimes you'll get a useless animal on the seashore however then we began seeing increasingly and plenty of of them appeared wholesome.

a few of them have been even alive then died throughout the day.

" THEN, NO ONE KNEW THE CAUSE.

BUT NOW U-S FISH AND WILDIFE IS ON THE CASE.

WITH THE HELP OF VAN SOMMERAN AND HIS TEAM, THEY'VE COLLECTED DOZENS OF THE DEAD PREDATORS AND SENT THEM OFF FOR TESTING.

THEY SHOW THIS- A VIRAL AND FUNGAL INFECTION THAT SOMEHOW MAKES ITS WAY INTO THE SHARKS BRAIN CAUSING IT TO SWIM ASHORE.

TAKE SOT "we hope" <<DIRTY RUNOFF FROM ALL THE RAIN MAY BE CAUSING THE PROBLEM BUT FISH & WILDLIFE HAS THE PROBLEM BUT FISH & WILDLIFE HAS YET TO CONFIRM — SIGOUT THE PROBLEM BUT FISH & WILDLIFE HAS YET TO CONFIRM — SIGOUT SCIENTISTS ARE ASKING PEOPLE NOT TO TRY TO PUSH BEACHED SHARKS BACK INTO THE WATER.

SINCE IT WON'T SAVE THEM.

INSTEAD, CALL FISH & WILDLIFE — SO EXPERTS CAN DO FURTHER STUDY ON THE ANIMALS.

NEW AT SIX.