How to Identify Porbeagle

To identify Porbeagle (Lamna nasus), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

Dark bluish-grey to blackish on the dorsal surface, fading to white on the ventral side. The demarcation between dorsal and ventral coloration is usually sharp. A distinctive white patch is often present on the posterior margin of the first dorsal fin.

Scale type

placoid

Mouth position

terminal

Distinctive features

Robust, spindle-shaped body, Conical, pointed snout, Large, crescent-shaped caudal fin with a prominent keel on the caudal peduncle, Small secondary keel below the main caudal keel, Large, blade-like teeth with small cusplets at the base, White patch on the posterior free tip of the first dorsal fin (often present, but can be absent in some individuals or populations)

Dorsal fin

Two dorsal fins. The first dorsal fin is large, triangular, and originates over or slightly anterior to the pectoral fin axil. The second dorsal fin is much smaller, originating over the anal fin.

Tail fin

Large, crescent-shaped (lunate) caudal fin with a distinct double keel on the caudal peduncle.

Pectoral fin

Long and narrow pectoral fins.

Distinctive fins

The presence of a small secondary keel on the caudal peduncle below the main keel is a key diagnostic feature. The white patch on the first dorsal fin is also highly characteristic.

Identification Tips

1. 1

   Body Shape

   Look for a stout, torpedo-shaped body, indicative of a fast-swimming pelagic shark.

2. 2

   Dorsal Fin

   Observe the first dorsal fin. If it has a distinct white patch on its posterior free tip, it is very likely a Porbeagle. Note that this patch can be absent in some individuals.

3. 3

   Caudal Fin and Keels

   Examine the tail. The Porbeagle has a large, crescent-shaped caudal fin and a prominent primary keel on the caudal peduncle, with a smaller, secondary keel located below it. This double keel is a crucial identifier.

4. 4

   Teeth

   If possible and safe, observe the teeth. Porbeagle teeth are blade-like with smooth edges and typically possess small, pointed cusplets at the base on either side of the main cusp.

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