Sturgeon are large, ancient fish known for their distinctive elongated bodies and bony scutes instead of scales. They inhabit freshwater and saltwater environments, primarily in the Northern Hemisphere. There are several species of sturgeon, some of which can live for over 100 years. These fish are famous for producing caviar, a delicacy made from their eggs. Sturgeon populations have declined due to overfishing, habitat loss, and pollution, leading to conservation efforts aimed at protecting these unique creatures. They play a vital role in their ecosystems and are considered a symbol of biodiversity.