Most fish carry the parasites that cause HITH but it doesn't affect them unless something weakens the fish. eg: old age, another disease, poor water quality, some sort of stress related issue. Then the pathogens get out of control and over-run the fish's immune system causing the signs associated with the disease.
It's a bit like when people catch the flu virus, they normally fight it off without a problem. But if the infected person is old or suffers from other ailments (diabetes) then there is a chance the flu virus in conjunction with the other problems will over-run the person's immune system and potentially kill them. Secondary bacterial infections can occur and respiratory problems may coincide to cause serious problems.
But if you're really concerned then take it to a specialist fish vet, or ask emmsy on here what she thinks it is. She is a vet that keeps fish. She might know. Her profile is below.
http/www.fishforums.net/user/41156/View-Member-Profile/
It's a bit like when people catch the flu virus, they normally fight it off without a problem. But if the infected person is old or suffers from other ailments (diabetes) then there is a chance the flu virus in conjunction with the other problems will over-run the person's immune system and potentially kill them. Secondary bacterial infections can occur and respiratory problems may coincide to cause serious problems.
But if you're really concerned then take it to a specialist fish vet, or ask emmsy on here what she thinks it is. She is a vet that keeps fish. She might know. Her profile is below.
http/www.fishforums.net/user/41156/View-Member-Profile/