"Gulf sturgeon are bottom feeders, and eat primarily macroinvertebrates, including brachiopods, mollusks, worms, and crustaceans. All foraging occurs in brackish or marine waters of the Gulf of Mexico and its estuaries; sturgeon do not forage in riverine habitat."
(Office of Protected Resources, http://www.nmfs.noaa.gov/pr/species/fish/gulfsturgeon.htm)
Atlantic sturgeon are benthic feeders and typically forage on "benthic" invertebrates (e.g. crustaceans, worms, mollusks) (Office of Protected Resources, http://www.nmfs.noaa.gov/pr/species/fish/atlanticsturgeon.htm).
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