I don't think it's a pure question of what produces more protein, but rather what produces more usable protein for the size of predators that are in your pond? FHM are a good starter source of protein for the smaller sized fish, but the GSH will be there longer, and will feed larger sized fish.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).