When I was fishing, all the salmon groups in the area slowly swam to the surface and one sat breaching the water surface and the group stopped moving. This might happen with other fish, but I only saw it with Cod. The screenshot below shows 3 fish groups with one out of each breaking the surface of the water and staying like that for about 20-30 seconds.
Environment
River biome between a plain and a birch forest/ jungle biome
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