One last poke lol

[Hanover Koi Farms]

Yes you can mix salt with F&MG . Doesn't matter if the FMG is 22% or 37% formaldehyde, and you can treat in situ with salt at any level we use for koih. Daily here at the farm we mix the two with up to .6% salinity and have for 30 years.
Anyone that thinks otherwise has most likely fallen into the rumor and speculation trap of all the misinformation out there. Others that state they has a " burning" of the fish from the mixture simply misdiagnosed the true reason for this "burn" that they experienced, but I can assure you it was not due to mixing salt and fmg.


This includes the manufacture of certain fmg products that state not to mix the two. They just put that on the label due to all the talk amongst certain hobbyists

John Fornaro

[aquaholic]

Salt or not, it's very easy to burn fish with FMG as formalin/formaldehyde is a pickling agent and unfortunately burnt tissue doesn't show until a day or two later when the damage is done. Gills and more delicate finnage areas are more prone.

[kdh]

Salt or not, it's very easy to burn fish with FMG as formalin/formaldehyde is a pickling agent and unfortunately burnt tissue doesn't show until a day or two later when the damage is done. Gills and more delicate finnage areas are more prone.

Can you post where you found this information? Have always found it to be safe with no issues.

[Hanover Koi Farms]

If you burn any fish with the standard treatments that were dosed properly, most likely you are treating fish with little to no slime coat. In this case even salt alone will burn them.
Before treating fish you must determine the slime coat integrity. Too little, excessive, or normal slime. This determines when to treat, what to use, and AR what dosage.
In the case of fish with little to no slime you must give them time and build their slime coat with low dose salt alone. Once they have a slime coat you can treat. Reverse this for excessive slime. If too much slime treatments will fail. In this case we reduce slime with pp, but this is tricky.
So before treating any fish you must determine slime coat integrity. There are more details on our website

[Hanover Koi Farms]

For example, when we pull fish from the mud ponds we look at certain variables before treating. Slime coat integrity, type of parasites and their degree of infestation, and if any bacterial issues are present. These observations tell us how soon to treat, and at what dosage. The worst scenario are fish that are heavily infested and they have little to no slime. We must build slime quickly and treat enough before the bugs kill the fish. This can be tricky.
It does not matter what else formalin is used for. We never treat with straight formalin alone. We always use FMG at either 22% or 37% formalin. Again it depends on those observations mentioned previously.
The main point is that you MUST evaluate the slime coat integrity before ANY treatment. Salt starting at point one percent is always utilized in every case. To what level we take it and how fast is the only thing that changes, again depending on the observations.
Failure to properly interpret slime coat integrity is the difference why some people burn fish as well as treatment failures. Again thete are more details on our website

[aquaholic]

Can you post where you found this information? Have always found it to be safe with no issues.

Increase in temperature will increase toxicity (effectiveness) of formalin and all the usual precautions of oxygen depletion for fish, premixing and wide distribution to avoid "hot spots" of higher concentration, carcinogenic inhalation to humans etc should always be kept in mind.

All my experiences have been hard learnt, I've killed and burnt lots of fish unfortunately.

Microscope before and after treatment is always a good idea as parasites quickly build resistance if dosages are not effective. I switch between copper and FMG treatments alternately.

[Hanover Koi Farms]

It is not possible chemically or biologically for parasites to become resistant to FMG because of how it kills them. Many folks talk about parasites becoming resistant, but in many, Not all cases, it's not possible. They can become resistant to things like salt however