In article , Gandalf
URL:mailto:Gandalf.not@home wrote:
HI Everyone,

Any one know of a good site to find what a strange marking on fish was, I
think it is an illness as it was perfectly round with the outer edge being
like half a tyre and about 10 mm across with an inner section looking like
an ulcer. It was on a 3 lb breams gill cover.

Any ideas anyone.

Without a sample of the tissue I doubt you'll ever know. If the surrounding
tissue was swollen, ie. there was some sign that the fish was
fighting/healing the damage then I'd tend to agree with Pete that it was
most likely an infected wound - 'though I couldn't suggest a cause. The
inner section was probably secondarily infected by bacteria/fungus.

Think about an ulcerated boil on a human - if untreated it can turn into a
similar form and might lead to systemic poisoning and even death.

One case is probably nothing to worry about, several should be a signal for
further action.

Cheerio,

--
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