esshup,

I misread the tamu article. The percentage dry weight of phosphorus in feed is <1.5%. Semicolons and commas flustered my reading of the allocations. See an excerpt below:

Quote
Most fish farmers use complete diets, typically made up of the following components and percentage ranges: protein, 18-50 percent; lipids, 10-25 percent; carbohydrate, 15-20 percent; ash, <8.5 percent; phosphorus, <1.5 percent; water, <10 percent; and trace amounts of vitamins and minerals.

This is in the lower range for whole fish on a dry weight basis:
[Linked Image from researchgate.net]

Correct the equivalent feed rate of 2.25 lbs phosphorous per acre from 26.50 lbs feed/acre to 150 lbs feed/acre. That's a pretty big difference. Still its there and one cannot feed without increasing the nutrient load. Of interest, the vast majority of phosphorous in fish is in the skeleton, the fins, and scales. The rest is concentrated mostly in organs. Phosphorous is essential to the growth of fish and insufficient quantities in the feed can lead to low growth (basically due to not having sufficient nutrients to grow bones, fins, and scales)

It isn't what we don't know that gives us trouble, it's what we know that ain't so - Will Rogers