And we keep a lot of Oncorhynchus mykiss in our aquariums. A commercial fish farm for Oncorhynchus mykiss has one goal in mind. Growing salable sized Oncorhynchus mykiss as quickly and cheaply as possible.
That study has basically no bearing on what is being discussed.
Many foods made for tropical fish are low in phosphates to prevent algae blooms when people over feed the fish.
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