Black triggerfish

The black triggerfish or black durgon (Melichthys niger), called Humuhumu'ele'ele in Hawaiian, is a blimp-shaped triggerfish with bright white lines running along its dorsal and anal fins. From distance, it appears to be completely black. However, upon closer inspection with good lighting, one can see that it is actually mottled dark-blue/green coloration often with orange toward the front of the head. Black durgons are capable of changing color based on their surroundings.[1]

Black triggerfish
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Tetraodontiformes
Family: Balistidae
Genus: Melichthys
Species:
M. niger
Binomial name
Melichthys niger
(Bloch, 1786)

These are not to be confused with their cousins, the Indian triggerfish or black-finned triggerfish (Melichthys indicus), which are often mistaken as being black triggerfish within the aquarium trade. The Indian triggerfish has never been found near Hawaii, but bears a striking resemblance to the black triggerfish because of the similar shape and coloration.

Range

Circumtropical. Hawaii, up through Polynesia, westward to the East Indies and across the Indian Ocean. The black triggerfish is also located around the southern coast of Africa. Although, the black triggerfish is commonly found in the Indo Pacific and Red Sea.

Habitat
School of black triggerfish near Waikiki

This species is found in open waters, shallows, and exposed reefs, 5–35 metres (15–115 feet) Seems to prefer inland/shores in the Ascension Island region where they are strangely prolific.

Size

On average, 12 inches, although it can grow to be up to 18 inches.

Diet

Omnivorous. Feeds upon small fish and squid. Shrimp, zooplankton, algae, and other marine plant life.

A study conducted in the Fernando de Noronha Archipelago of the southwest Atlantic Ocean, revealed the feces and vomit of Spinner dolphins (Stenella longirostris) formed part of the diet of twelve species of reef fish from seven different families. The most prolific consumer was the black male, which could even discern the postures dolphins assumed prior to voiding and positioned themselves for effective feeding. All these offal eating fish species are recorded plankton eaters and it is considered that this type of feeding may represent a change in its usual diet, i.e. drifting plankton.[2]

See also

References
  1. Hoover, John P. Ultimate Guide to Hawaiian Reef Fishes. Mutual Publishing, 2008
  2. Sazima, Ivan; Sazima, Cristina & Silva, José Martins (2003). "The cetacean offal connection: Feces and vomits of spinner dolphins as a food source for reef fishes". Bulletin of Marine Science (abstract). Miami. 72 (1). Retrieved 26 April 2015.
  • Hoover, John P. (2008). The Ultimate Guide to Hawaiian Reef Fishes.
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