So what causes the daily fluctuation in the DO and Chl readings? Is that a tidal signature?

Tons of dead mullet, sheephead, and catfish in my CB canal.......some trout and reds, but maybe fish that mainly eat plants/algaE/ barnacles are dying first....... is it(THE DOODOO) in the plant life?

Oxygen fluctuates in response to production by plants during the day and uptake by everything else at night. Crazy thing about oxygen with this bloom is how much time it spent at >100% saturation in the lead up to the crash.

But it is normal in an algae bloom situation for dissolved oxygen to get really high during period of maximum photosynthetic activity during the day and then decline at night when the plankton respire.

Chlorophyll in the in continuous field samples is measured by flourescence. I don't know if that daily fluctuation is real or an artifact of flourescence changes. I think that fluorescence of the chlorophyll changes as photosynthetic activity changes. I've seen papers where fluorescence change is used to measure changes in photosynthetic activity. Sort of like when the chlorophyll is all charged up by the sun just before the sample gets pulled through the sensor then it fluoresces more than it does at night. If that is the case then the actual chlorophyll concentration isn't changing daily like that. Since chlorophyll is used as a proxy for phytoplankton abundance/biomass then I would expect that there is a calibration to correct for fluorescence changes. But plankton isn't my thing so maybe somebody that knows more about it can answer better.

falling off the front page here

(as well as the tv news, newspaper, etc etc etc)

what else is new?

Well, chlorophyll is returning to "high normal" - my term not an official one -

at the north IRL kilroys, around 40-50 ug/L.

Maybe the bloom is finally fizzling.  

Three months worth.

Long time to shade out the deeper seagrass.

We  took our little Proline center consol for a run out of Manatee Cove marina at Patrick Sunday evening and saw lots of mullet jumping,  large ones,  and some smaller fish pods that the pelicans were diving for.  Also saw a good sized gator(possibly cleaning up the remainder of the dead fish?) in the water by the water drain.  On the beach near the channel we saw some horseshoe crabs and although they were on their backs for some reason they were kicking their legs so they were alive.  Also noticed quite a few wading herons and egrets,  and saw pods of dolphin on the south side of the Pineda causeway chasing fish.  Saw manatees as well.  Maybe it isn't as grim as I had suspected.  At least there are still mullet around.  I am hoping they are the survivors and not the ones yet to die.