I based my comments on what your stated goal was...growth.
The lower priced feeds have usable nutrients and will by definition produce growth. The higher quality feeds are not priced based on Name Recognition or Reputation. They are more expensive due to using more expensive, highly digestible ingiedients.
IMO "cheap" feeds can cause less growth by getting fish to fill up on food they can't utilize as well as they would by eating naturally available foods.
If "cheap" feed takes 10 pounds of feed to produce 1 pound of flesh and a "better" feed takes 2 pounds of feed to produce a pound of flesh, it is simple math to realize the "cheap" feed actually cost you 5 times as much for that pound of flesh. Then it comes down to whether or not the "better" feed is 5 times the final price of the "cheap" feed if you want to campare apples to apples.
Additionally, Higher digestion of feed means less waste to pollute the water. This allows more pounds of fish that can be produced in the same amout of water.
Last edited by Rainman; 09/02/10 12:11 PM.