A lonely damselfish behaved strangely, and looked oddly too: a belly swollen so badly the scale bristles, a white stringy something dangles at the cloaca.
I could not get an idea of what it might be, but first the European-Marine-Life.org expert team helped, expressing an opinion, that the fish is infected by parasites, then Pete Liptrot from the Bolton Museum wrote, that he is surprised I was able to find a specimen in the wild in that advanced, terminal state. The abdomen is swollen because of the oedema and the white stringy faeces indicate an internal problem as well.
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