Bluefin refers to a group of large tuna species, primarily the Atlantic Bluefin Tuna, Pacific Bluefin Tuna, and Southern Bluefin Tuna. These fish are known for their impressive size, with some individuals weighing over 1,000 pounds. Bluefin tuna are highly valued in culinary markets, especially in sushi and sashimi dishes, due to their rich flavor and fatty texture. These fish are found in both temperate and tropical oceans, often migrating long distances. Bluefin populations have faced significant decline due to overfishing and high demand, leading to conservation efforts aimed at protecting their habitats and ensuring sustainable fishing practices.