07-13-2012, 09:41 AM
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Yes...check the ingredients. Many fish foods use lower quality fish meals which require copious amounts of starch (wheat, oat, soy, rice flours) as a binder. In some cases, the starches are the first (largest) ingredients and used as fillers to increase the crude protein value.
New Life Spectrum uses a higher quality fish meal made from whole fish (I believe Herring and Krill).
I think the best foods are made from fresh fish as less starch/binder/filler is required. Omega One claims to use fresh fish and kelp.
Ed's Almost Natural Tropical Fish Food is made from fresh food grade (the same fish you or I would serve at the table) fish.
API is marketing foods made from more sustainable proteins and may also be worth a look.
Note: Higher quality foods result in healthier stock with less fish waste (as much of binders/fillers just pass through).