 Because their diet consists of mollusks that can cause paralytic shellfish poisoning (PSP), in addition to other bottom-dwelling organisms such as grass shrimp, marine worms, isopods, and amphipods, their unique feeding pattern possibly reflects an adaptation to prevent PSP that coincides with higher rates of algal blooms in summer.Juvenile Gulf sturgeon remain in the spawning river until roughly two years of age, eating there.Thereafter, they join the adults in their anadromous migrations and eating habits.