is this from abrasion??

clarimore · May 5, 2022

I bought 3 chromis, and a tiny scooter blenny sunday ( 4 days ago) put them in my qt tank running .25 copper at the moment. they looked good, except i spectinf them in the bag before i vought them the one had a small spot on it.. but I've seen that happen when you catch fish w a net. it is looking way worate and bigger, plus another one has an odd dark coloring on both sides down one the bottom edge of it. of the three, one is Def bigger.. that one has no marks. chromis are not aggressive, except now that the one looks bad it is getting g chased a bit

Sharkbait19 · May 5, 2022

#fishmedic
It’s possible it’s from injury, but it also looks suspiciously like the lesions associated with uronema, which is extremely common in chromis.

HuduVudu · May 5, 2022

@clarimore

Urinoma. Chromis are notorious for this. It is a killer.

@Jay Hemdal

clarimore · May 5, 2022

HuduVudu said:
@clarimore

Urinoma. Chromis are notorious for this. It is a killer.

@Jay Hemdal

will the tiny blend end up w it?

Jay Hemdal · May 5, 2022

clarimore said:
will the tiny blend end up w it?

Uronema can’t really be treated when it is internal like this, but it also isn’t super contagious to other fish.
I was curious though - what copper product are you running? 0.25 ppm doesn’t match up to an dose I’m familiar with.
Jay

HuduVudu · May 5, 2022

Jay Hemdal said:
Uronema can’t really be treated when it is internal like this, but it also isn’t super contagious to other fish.
I was curious though - what copper product are you running? 0.25 ppm doesn’t match up to an dose I’m familiar with.
Jay

Jay what causes it?

Also why does it seem so pervasive if it isn't really that infectious?

Jay Hemdal · May 6, 2022

HuduVudu said:
Jay what causes it?

Also why does it seem so pervasive if it isn't really that infectious?

There seems to be at least two types of "Uronema" - external and internal. External is seen in seahorses and seadragons, and responds to formalin and some other treatments. Those lesions start on the outside of the fish. The internal "Uronema" is a protozoan that gets inside the fish (I don't know how) and begins to consume the muscle tissue. Eventually, the lesion breaks through the skin, making it seem external, but it has actually be growing internally for quite some time. There may even be other species of protozoan involved. In general, these are all Scuticociliates, I can't tell them apart, and many species are free-living and feed on bacteria and organic matter.

The species type and collection/transport factors all seem to play a role in its transmission. The commonly affected fish are; green chromis, yellow coris, Anthias and sometimes butterflyfish. They almost always show infection in the first 40 days following importation - that implies something happening in the supply chain. Additionally, during Covid, when the supply chain was so disrupted, Uronema seemed even more common.

Somebody shared a video with me of a veterinarian injecting a clownfish with metronidazole as a treatment. Trouble is, I don't have anything more than that to go on, and to be honest, I question the diagnosis, as I've never seen internal "Uronema" in a clownfish.

I wish I had the time/resources to study this further, there is so much I don't know about it!

Jay