What is arrowhead shark?

There is no such thing as an arrowhead shark. It is possible that you may be referring to the arrowhead stingray or arrowhead dogfish. Below is some information on both species:

Arrowhead Stingray:

• Found in the Indo-Pacific region
• Can reach up to 1.5 meters in length
• Has a disc-shaped body with a protruding snout
• Has dark brown or grayish-black coloration with a distinct arrowhead-shaped marking on its back
• Feeds on small fish, crustaceans, and mollusks

Arrowhead Dogfish:

• Also known as the piked dogfish or northern spotted dogfish
• Found in the northern Pacific Ocean
• Can reach up to 1 meter in length
• Has a slender body with a pointed snout and large eyes
• Has a dorsal fin with a distinct arrowhead shape
• Feeds on small fish and squid.