- Midway Atoll. 30 ft.
are an unusual and sometimes comical-looking group of fishes found
in subtropical and warm temperate seas. Their high, laterally compressed
bodies are typically marked with bold black diagonal bands and their
small mouths have thick fleshy lips. Bony knobs often protrude in
front of the eyes. Morwongs are related to hawkfishes, and, like hawkfishes,
many species have thickened pectoral fins which allow them to sit
upright on the substrate. They typically feed on small crustaceans
and other invertebrates found in sand. Occurring from South Africa
to the Pacific coasts of Peru and Chile, morwongs attain their greatest
diversity in the cool waters off southern Australia (hence the distinctive
aboriginal name). Above the equator they occur in Japan, Korea, China,
and, of course, Hawai`i. This type of distribution, known as "anti-tropical,"
is characteristic of a number of Hawai`i's fishes. Although morwongs
were formerly placed in their own family Cheilodactylidae, ichthyologists
have recently combined them with the trumpeters (a small group of
exclusively south Australian fishes) into the single family Latridae.
During this shakeup, they changed some genus names as well, including
that of our Hawaiian species, which used to be Cheilodactylus vittatus.
Hawaiian Morwong - Midway Atoll. 30 ft.
Goniistius vittatus (Garrett, 1864)
These odd fish have thick reddish
lips and bold diagonal black stripes which may serve to disrupt
their outline or to make them appear extra-large to predators. Bony
lumps and bumps adorn the front of the head. They often prop themselves
on the bottom with strong pectoral fins, somewhat like hawkfishes.
Unlike hawkfishes, however, they appear to be nocturnal and are
probably resting rather than waiting to ambush prey. They feed by
pressing their thick fleshy lips to the bottom, sucking in sand
and detritus, and filtering out the small invertebrates it contains.
(While feeding this way, some morwong species are known to almost
stand on their head!)
Although common at Midway and other cool, subtropical Northwestern
Hawaiian Islands, morwongs are rare in the main islands. Divers
on Kaua'i and along O`ahu's north shore have perhaps the best chance
of seeing them. (I like to tell people that if they see a morwong,
they will enjoy one year of good luck!) The Hawaiian Morwong is
now considered endemic. Previously it was lumped together with a
similar species from the subtropical South Pacific islands of New
Caledonia and Lord Howe. Morwongs share their Hawaiian name ("strong
kapu") with several butterflyfishes. The species name
means "striped." To 16 in.
are two of the very few Hawaiian Morwongs I have seen in the main
Hawaiian Islands.The one above was at snorkeling depth inside the
reef at Hanauma Bay, sitting under ledge in the area known as "Sandman's
Patch." It stayed in the vicinity for a few weeks and then disappeared.
Below is a cute baby about 3 in. long, seen in about 3 ft. of water
at Lydgate State Park, Kaua`i.
a morwong altercation at Midway. The bottom fish appears to be chasing
the top one. Note how several of the black bands have paled near the
top of the head of both fish, revealing a spotted pattern. This appears
to be morwong-speak for "get out of my territory" or "leave
me alone." But who knows? Perhaps it means "Come here my
darling." We need more divers observing morwongs.