Backyard Aquaponics
A place to discuss aquaponics

Hi guys I am.new to this site and wasn't sure where to.post this subject. I have attached a photo of one of my yabbies in my tank at home. Only just noticed this on his tail, I have a filter running constantly and other yabbies and guppies also. If any one has any information on what it is I would be greatly appreciative. Thanks in advance!

I don't know what it is but I'd definitely be quarantining it from the other yabbies.
It may be fighting damage in which case it will be cured at the next moult.

could be worth sending the photo to the Department of agriculture they might
Identify it for you if no-one else here can help
http://www.agriculture.gov.au/general-inquiries?query=aah