Unknown fungus

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Hi.

Can anyone identify what my goldfish has and advise how it should be treated. See picture.

I can't find anything similar in all the searching I've done.

It's in a 4500 litre pond with 20 other fish (isolated it now obviously). All water parameters are zero (including nitrate). No other fish in the pond has this. It is 2 weeks since I found and isolated it. I've been treating it with a malachite green solution (can't remember the brand) and it has had no effect. The 'fungus' does not seem to move so I don't think it is a parasite - but perhaps someone else can tell me?

Thanks in advance
20171008_170340.jpg

Matt
 
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Meyer Jordan

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Formalin is recommended for treating severe fungus issues of fish. I would give this a try. Must be administered in an isolation tank.
This fish also has fin rot which is indicative of fungal infection. The darker color may be caused by cyanobacteria (blue-green algae) growing on the fungus.
 
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j.w

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That is strange, it almost looks like he stood still too long and moss started growing on him. Poor thing. Hope you can fix him up.
 
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Formalin is recommended for treating severe fungus issues of fish. I would give this a try. Must be administered in an isolation tank.
This fish also has fin rot which is indicative of fungal infection. The darker color may be caused by cyanobacteria (blue-green algae) growing on the fungus.
I'll try it out. Thanks
 

Meyer Jordan

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Would it not be best to try remove it first then treat?
Yes, if one has the capability to anestheticise the fish first. Attempting to remove any growth while a fish is actively resisting will not only severely additionally add stress to the fish but may also risk more damage to the area where the growth is attached.
 
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