What secondary benefit do the crushed shell byproducts from the drum's hard-shelled diet provide to other fish species?

Answer

They can create useful spawning substrate for game fish

The crushed shell material resulting from the drum's constant bottom feeding can actually create useful spawning substrate, benefiting game fish such as smallmouth and largemouth bass.

What secondary benefit do the crushed shell byproducts from the drum's hard-shelled diet provide to other fish species?
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