I'm not one of the biologists, but maybe you could give them more info on the size of lake you are referring to, maybe the overall health of the lake and the fish in it. Are the crappie stunted, and all the same size? Are there any bass, catfish, bream and are they healthy? Is there a population of shad? They may not want to give an answer without knowing the full story here. When the biologists make recommendations on harvest, they usually visit the lake several times/year doing electrofishing to sample populations, the ratio of the different species, presence/absence of forage, etc.