Blue Shark Identification Guide
Recognize a Blue Shark by its slender build, deep indigo back, and unusually long pectoral fins.
Read the full Blue Shark encyclopedia entry →
Key identification features
- Slender, elongated body with a lean, streamlined build and a narrow head
- Vivid deep indigo-blue back that fades gradually to a crisp bright white belly
- Notably long, narrow, pointed pectoral fins that stand out compared to most other sharks
- Large eyes and a long, pointed conical snout
- Fine, saw-edged teeth adapted for gripping soft-bodied prey such as squid
Common look-alikes
- Mako shark: more robust, muscular body with brighter metallic blue color, shorter pectoral fins, and visible teeth even with the mouth closed
- Silky shark: bronze-gray rather than blue coloration, smaller eyes, and a low ridge between the two dorsal fins
- Oceanic whitetip shark: stockier build with rounded, mottled white-tipped fins rather than the blue shark's long, plain pointed pectorals
Where you'll see one
Blue sharks are highly migratory, favoring deep, cool offshore pelagic waters across temperate and tropical oceans worldwide, typically staying far from shore over open water and diving to considerable depths by day before rising toward the surface at night to feed.
Frequently asked questions
How do I tell a blue shark from a mako shark?
Check body shape and fin length: blue sharks are slimmer with much longer pectoral fins and deeper indigo color, while mako sharks are stockier, brighter metallic blue, and show visible teeth with the mouth closed.
What is the clearest way to recognize a blue shark?
Look for the striking contrast between a deep blue back and bright white belly paired with unusually long, slender pectoral fins.