Biev
New member
There are visible differences. They both look a cottony in the early stages, little patches of necrotic tissue typically on the head and gills, but saprolegnia turns hairy and puffy, almost like a dandelion puff. It spreads out like a sphere, whereas columnaris runs along the skin. It makes these raised areas where the skin is infected with bacteria but not yet necrotic (the fuzzy white bits around the gills in these photos are the necrotic bits). In a pale axolotl you should see redness in those areas, they are inflamed. I'm pretty sure the skin is attempting to encapsulate the bacteria to contain them (hence all the little bumps). Also the necrotic regions are white (until they get dirty with debris), but the bacteria that cause columnaris are yellow rods. They stack up like little haystacks, and you can actually see them in these pictures, in between the white spots, they stick out like mini spaghettis. (By the time you can see them with the naked eye, there really are a ton of them!)
I should specify again, I'm not a vet, just an animal care technician and my specialty is fish, not amphibians. This does look very similar to what I would expect to see in a scaleless fish with columnaris, though.
Oh, one thing I didn't mention is that hydrogen peroxide gently applied to the skin with a cotton swab while the animal is (briefly) out of the water also works to kill the bacteria. Draining the tank, cleaning it with peroxide and rinsing well would work to disinfect it.The only thing is, I don't know how axolotls react to peroxide. I know they handle the antibiotics, though, because I treated mine this way.
I should specify again, I'm not a vet, just an animal care technician and my specialty is fish, not amphibians. This does look very similar to what I would expect to see in a scaleless fish with columnaris, though.
Oh, one thing I didn't mention is that hydrogen peroxide gently applied to the skin with a cotton swab while the animal is (briefly) out of the water also works to kill the bacteria. Draining the tank, cleaning it with peroxide and rinsing well would work to disinfect it.The only thing is, I don't know how axolotls react to peroxide. I know they handle the antibiotics, though, because I treated mine this way.