The blue shark is a slender, fast-swimming predator found in deep, temperate, and tropical waters around the world. Known for its vibrant blue coloration on the upper body and white underside, this shark can grow up to 3 meters in length. Blue sharks are highly migratory, traveling long distances across oceans in search of prey, which mainly consists of squid, fish, and small invertebrates. Despite their predatory nature, blue sharks are generally not dangerous to humans. They play an important role in marine ecosystems, helping to maintain the balance of species in their habitats. However, blue sharks are vulnerable to overfishing, particularly as bycatch in longline fisheries, leading to concerns about their conservation status.