You might find this paper to be an interesting read.
http://rdo.psu.ac.th/sjstweb/journal/34-5/0475-3395-34-5-487-494.pdf
Especially this part.......
3.6 Susceptibility of other fish species
No mortality or sign of disease was observed in goldfish, guppy and platy fish injected with S. vortens or any of the control fish. Although lethargy of guppy and platy injected with S.vortens was recorded, all fish recovered within one day post injection. No S. vortens was detected in survived fish examined at the end of experiment.
Thanks RD, very useful but the complete conclusions simply says:
In this study, no mortality was observed in goldfish, guppy and platy fish injected with S. vortens indicating that these experimental fish were resistant to artificial infection
To me this just means they were not susceptible to being infected in the method they used..
Also, in regards to the platy, guppy and goldfish group I find their explanation a bit confusing.....
They say at first
Tissue samples from all dead or survival fish were aseptically collected and examined to confirm diplomonad flagellates as the cause of death.
Then further down below:
No mortality or sign of disease was observed in goldfish, guppy and platy fish injected with S. vortens or any of the control fish. Although lethargy of guppy and platy injected with S.vortens was recorded, a
ll fish recovered within one day post injection.
No S. vortens was detected in survived fish examined at the end of experiment.
How do they know all fish recovered within one day post injection?....?
What do they mean by "survived" fish. They are saying that no mortality was ovserved....and at the same time they collected tissue samples from "dead or survival" fish..
Or perhaps they simply mean that since there was no mortality or sign of the disease in guppy, platy and goldfish, they weren't tested for it straight way unlike the anglefish group who exhibited symptoms and high mortality rates. I understand that at the end of the study they did test the fish for S.vortens but is that after they treated them or before? Were live platies (since there was no mortality) tested for S.Vortens at any stage post infection and before administering meds...? It's not clear to me at all....
All I know is that my fish recovered by treating with Magnesium sulphate soaked food and nothing else! So perhaps that study has some truth to it, that platies do not die within 14 days unlike angels.....It affects them over months and they do recover from it but only if treated!
I took pictures at the time of the severely affected platy I had left for dead....
Here it is before treatment next to a healthy platy of same age!. (It was healthy in appearance but had stringy white poop, all of them did)
Not all of them at once or for all the fish but symptoms included emaciation, loss of body mass, stringy white poop and hook like appearance at late stages....or just stringy white poop....They do recover from it by treating for hexamita, so it can't be mycobacteria....None other fish were affected, only the platies.
My test subject and basis for efficiency of the magnesium sulfate soaked food was the obviously emaciated platy on the picture below as if she made it, the healthy looking platies that had no visual signs besides stringy white poop should have also recovered....
And my sickly platy made it....This is several months later after the treatment. Trust me the recovery was slow but its belly visually started filling out within 2-3 weeks after which I was almost certain the treatment worked but was not sure if the recovery would last.. It did....But as you can see, this several years old platy never grew to the size not severely affected platies did.
