CAPITALIZE ON THE COOLER WEATHER THIS WEEKEND TO GET ALL THESE FIRES CONTAINED. >> BIOLOGISTS ARE NOW MONITORING THE WATER AT LAKE ELSINORE TO SEE IF FALLING ASH FROM THE AIRPORT FIRE MAY BE CONTRIBUTING TO A FISH DIE OFF AT THE LAKE. THOUSANDS OF THREADFIN SHAD HAVE BEEN FOUND DEAD IN THE LAKE IN RECENT DAYS. ASH FROM FIRES CAN ALTER PH LEVELS OF THE LAKE, AND IT'S NOT CLEAR WHETHER THAT MAY BE CONTRIBUTING TO THE FISH DYING OFF. ANOTHER FACTOR THAT MAY BE KILLING THE FISH, THE EXTREME HEAT WE'VE BEEN EXPERIENCING IN RECENT WEEKS. >> WHEN WATER HEATS UP, IT'S CARRYING CAPACITY OF OXYGEN DECREASES. SO THERE'S LESS DISSOLVED OXYGEN AT THE BOTTOM OF THE LAKE. AND SO THIS TYPE OF FISH HAS GOES INTO CRISIS KIND OF A STRESS. AND THAT'S WHAT WE'RE SEEING TODAY. >> LAKE ELSINORE HAS SET UP MONITORING STATIONS TO COLLECT MORE DATA TO SEE WHY THE FISH ARE DYING. MEANTIME, THE LAKE REOPEN