This lump is pretty hard, 2 out of 20 sampled trouts were affected by this strange mass in the ventral area (also the fin is strangely red). When I dissected the trout, the inside of the excrescence looked red.
Hallo,
in general, disease differentiation based on pictures only is extremely difficult and impossible. Therefore only a few ideas. Such phenomena as shown can originate from an intensive furunculosis infection, but a lot of other reasons may be possible also. My suggestion is to contact a local fish vet, who is able to differentiate the infection.
Furunkulos, i.e. the bacteria Aeromonas salmonicida salmonicida can cause bleeding around the fin bases. But I agree, the best is to contact a fish vet for a better answer.
may be this was atypical Aeromonas salmonicida ssp.salmonicida at the beginning of disease . Because for this disease ulcears or sores on the body are more suitable signs.
But may be this is Vibrio vulnificus,it causes haemorrhages and reddening on fins, I met with such cases in fish. You have to make bactriological tests.
Dear Riccardo,
You can ask your question directly with my colleague Dr. Jalil Zorriezahra at the following email. He is an expert in this field.
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