"High protein foods for most fish are naturally occurring in the wild. Such as insects, larva, and even other fish."
Which of course is incorrect - those natural foods, found in nature, are comprised or 70-90% water content, which unlike in dry foods (which are typically 5-10% moisture content), drives the value of crude protein percentage way down. As an example;
A typical analysis of freeze dried bloodworms.
Guaranteed Analysis
Min. Crude Protein - 55%
Min. Crude Fat - 3%
Max. Crude Fiber - 5%
Max. Moisture - 5%
A typical analysis of frozen bloodworms. (from the same manufacturer as above)
Guaranteed Analysis
Min. Crude Protein - 6.3%
Min. Crude Fat - 0.8%
Max. Crude Fiber - 0.3%
Max. Moisture - 91.2%
High protein? Not likely! High water content, most certainly.
I would love to see pics of all of these FH fed very high protein dry pellet foods, that lived very long lives. Even the most pampered designer fish, including FH, have relatively short lifespans, and are typically more prone to health issues, compared to non line bred, non-designer fish. Is is for this exact reason why I no longer keep FH.