The same could be said for myself. [Bugs? Easy peasy. But he can speak about fish as much as he can about dogs. Not any more than the average person. So consider this a warning that he won't exactly be of much use. There are diseases and types of fungus, but he's never heard of one with shimmering as a symptom.] The reason is that they are not my specialty.

[Since Xiaoqiao is letting him take a look, he'll move in a little closer. Of course he's not going to be prodding at the fish. Only looking down at the poor thing. Hello there, Xiao'yu.]

It seems different from what is known as a "shiny" pokemon... [thank you for that helpful contribution, Shino.]