Oxygen levels, seasonal temps and the amount of waste created are the biggest factors what dictates fish numbers
It won’t matter what species of trout you stock they will target future fry numbers. When I owned an aquaculture outfit raising rainbow I kept my sizes separated for good reason. I have seen rainbow eat fish half there body length
350 is a very reasonable number for the information you provided. The truth is the higher you push the numbers the higher your risk is and added maintenance can be a factor
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