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Here's one possibility
Question - When your fish breached, was there a storm front or low pressure system moving into your area within the next 24 hours?
The reason I ask is that over the years, and on que, when a weather front begins to move into my area, I notice that the barometric pressure of a low pressure system compresses the water and can irritate the fish via their lateral lines. They have a sense of being incomfortable. It seems to make them act like they just put a new coat on that doesn't quite fit right (if that makes sense). This has been going on for many years.
As far as your shiro showing signs of stress, it could be related but it could also be related to recent rain water that got into the pond with some funny stuff in it. I also notice that occurs with my shiro and my tancho showa. Right after a storm, their skin shows stress. Once I do a water change and wait 24 hours, they go back to their normal clear shiroji on the shoulders.
Hope this helps. Just something most people don't look for but seems to be right under our noses.
Mike
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