What is blue marli?

Unfortunately, there is no such thing as a blue marli. It is possible that you may have meant "blue marlin", which is a species of billfish found in the Atlantic, Indian, and Pacific Oceans. Blue marlin are known for their distinctive blue-black coloring on their back and sides, and their incredible speed and strength as game fish. They can grow up to 14 feet long and weigh over 1,500 pounds. Blue marlin are highly prized by sport fisherman, but due to overfishing and bycatch in commercial fisheries, their populations have declined in some areas. Conservation efforts and regulations are now in place to protect these magnificent fish.