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Shark Info 1 / 01   (03-15-2001)

Author

  Intro:

Communicating with Sharks

Shark Info

  Main article:

Communicating with Sharks

Dr. E. K. Ritter

  Article 1:

Sharks seen through the eyes of filmmakers

John McKinney

  Article 2:

Whale shark tourism in the Philippines

Shark Info

  Article 3:

GIMEC Meeting in New Orleans

Dr. E. K. Ritter

  Article 4:

Successful launch of the Shark Exhibition in St. Gallen

Shark Info

  Fact Sheet:

Smalleye Hammerhead Shark

Dr. E. K. Ritter


Fact Sheet: Smalleye Hammerhead Shark

S. tudes

The smalleye hammerhead shark Sphyrna tudes, often called golden hammerhead because of its golden coloring.

Compagno

The smalleye hammerhead shark, or golden hammerhead as he is called in the only documentary film ever made of him, belongs to the rare species of hammerheads. The "film name" is attributed to its colorful appearance.

Biology of smalleye hammerhead (Sphyrna tudes)

Not much data is available on smalleye hammerheads because they have not yet been scientifically researched. As with all other hammerheads this species also has the prominently formed hammer-like head.

Description

The most important characteristic of this hammerhead species includes its striking head shape, golden coloration and - compared to its relatives - very small eyes which also account for its name. Compared with other hammerhead species, this shark has a prolonged second dorsal fin and anal fin.

Size

The maximum size of these animals is about 1.5 meters long, relatively small when compared to the largest representative of its family known as the great hammerhead (Sphyrma mokaran) which can reach lengths up to 6 meters.

Feeding

It seems that smalleye hammerheads prefer to feed on small fish, however, a few stomach analyses have shown that they apparently also eat newborn scalloped hammerheads (Sphyrna lewini) in addition to softshelled animals.

Reproduction

Although its reproductory habits are relatively poorly researched, we do know that, as with other hammerheads, they are viviparous and have a yolksac placenta. Females reach sexual maturity after reaching a length of approx. 120 cm, males at 110 cm. The smallest pups seen to date were 30 cm long as they were captured, which presumably is their approximate size at birth.

Distribution

Smalleye hammerheads prefer the flatter regions (up to 12 m) of the Continental Shelf in tropical and subtropical regions. Their populations appear to be limited to the East coast of South America, from Venezuela to Uruguay.

Behavior

Once again we do not know enough about this species. Earlier research results turned out to be misleading because the initial description better matched the very similar species known as the whitefin hammerhead (Sphyrna couardi) rather than the smalleye hammerhead.

Encounters with humans

Smalleye hammerheads pose no threat to humans because of their size.

May be published only by indicating the source: Shark Info / Dr. Erich K. Ritter



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last change: 06-04-2016 10:48