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I've given it some thought, and I'm leaning towards ... Drakkosha.
Argument 1: Drakkosha is half-Dragon (scales) and half-Cat (cats, as everyone knows, love fish). It's very likely that the scales could belong to her.
Argument 2: Drakkosha is a well-known artist on the forum, and while shooting at Zubr at night, she could have easily forgotten a jar of water at the crime scene.
I think that, in the overall context, these are quite strong pieces of evidence that should be considered.