ID please

[Cooper 2020]

Hi
Currently battling Amphidinium Dinoflagellates, now starting to see these perfectly round non moving brown dots on the sand samples under the microscope.
Please can someone ID these?
Thanks

 

[Flippers4pups]

@taricha,

Have you read this:

Dinoflagellates – Are You Tired Of Battling Altogether?

I don't know what percentage of folks had luck battling dinos with any of the methods in the old Dino thread but it's obviously a very low percentage, so I'd like refresh folks on the natural alternatives and lay out three areas of info: some of the factors that contribute to a dino outbreak...

www.reef2reef.com

 

[Cooper 2020]

@taricha,

Have you read this:

Dinoflagellates – Are You Tired Of Battling Altogether?

I don't know what percentage of folks had luck battling dinos with any of the methods in the old Dino thread but it's obviously a very low percentage, so I'd like refresh folks on the natural alternatives and lay out three areas of info: some of the factors that contribute to a dino outbreak...

www.reef2reef.com

Yes thanks I have , I’m more wondering what the round circles are as these are just starting to show up but they don’t move at all and are bigger than the Dinoflagellates under the microscope

 

[bobssecrtsn]

Hi
Currently battling Amphidinium Dinoflagellates, now starting to see these perfectly round non moving brown dots on the sand samples under the microscope.
Please can someone ID these?
Thanks

It looks like coolia to me.

 

[taricha]

Currently battling Amphidinium Dinoflagellates, now starting to see these perfectly round non moving brown dots on the sand samples under the microscope.
Please can someone ID these?

I don't know for certain what they are, but because we've seen them co-occur with amphidinium outbreaks that often have no other kinds of identifiable dino cells, I'm leaning toward the explanation that these are a resting stage or cyst of the amphidinium dinos.
There's almost no scientific lit on our problem kind of amphidinium, so info on their cyst or resting phase is totally absent. But other dinos often form cysts when conditions become unfavorable. So this could be a good sign. That's my best guess.

 

[Cooper 2020]

Thanks will have to see how things go, the words “good sign” I like