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These fish were lined up on their own. If I got close, they would skitter off into the stream. They would return after a bit and line up again.
Lovely and very interesting, can you give us more information? Thank you for sharing this great spotting.
I've worked in the fisheries field and done quite a bit of stream surveying. I've never seen this type of behavior before. The stream looks familiar but I'd like to talk with you about the location where you observed this.
Incredible encounter so rare!
They look like some kind of Cichlid interesting behavior.