The Lake Sturgeon (Acipenser fulvescens) is one of the oldest and largest freshwater fish species in North America. They can grow over 6 feet long and weigh several hundred pounds. With... The Lake Sturgeon (Acipenser fulvescens) is one of the oldest and largest freshwater fish species in North America. They can grow over 6 feet long and weigh several hundred pounds. With their shark-like bodies and rows of bony plates, Lake Sturgeons are bottom-feeders, using their vacuum-like mouths to suck up small invertebrates and fish from the sediment. Due to overfishing and habitat loss, they are now considered threatened or endangered in many areas.Click here to read more about Lake Sturgeon.