Wekeʻa: The Square-Spot Goatfish of Hawaiian Reefs

Pronunciation: Wekeʻa, approximately “weh-keh-ah,” with a brief catch before the final “ah.”

Meet the Wekeʻa

A silvery fish with a yellow stripe and a dark spot along its side, wekeʻa has more than one useful English name. The square-spot goatfish and yellowstripe goatfish are the same species, Mulloidichthys flavolineatus. One name highlights its dark marking; the other points to the stripe running along its body.

Look beneath the chin and you will find another important feature: two barbels that help the fish locate food. Those whisker-like structures are the reason goatfishes have their English family name, and they offer a clue to how these fish make a living around sandy reef habitats.

Square-Spot or Yellowstripe?

Both names describe this species. FishBase and Fishes of Australia list square-spot goatfish among the common names for the yellowstripe goatfish. Waikīkī Aquarium identifies wekeʻa as Mulloidichthys flavolineatus.

Common names can make fish identification feel more complicated than it needs to be. In this case, the two English names are not competing identifications. Keeping the scientific name alongside them helps connect different books and fish guides to the same animal.

How to Recognize Wekeʻa

Look for the combination of a slender, pale body, a yellow stripe running along the side, and a dark blotch within that stripe beneath the first dorsal fin. Two chin barbels and a forked tail round out the picture.

Body: Slender and pale, with a silvery appearance.
Stripe: Yellow, extending along the side from near the eye toward the tail.
Spot: A dark rectangular or oval blotch within the stripe.
Chin: Two barbels used to help locate food.

The Reef Environmental Education Foundation notes that the dark spot can fade or become more pronounced. A faint spot does not automatically rule the species out. Use the body shape, stripe, and barbels together rather than depending on one marking.

What Are Those Chin “Whiskers” For?

Goatfishes are bottom-feeding carnivores. Hawaiʻi’s Division of Aquatic Resources explains that their paired chin barbels help them locate food and can tuck along the sides of the jaw when not in use.

That tucked-away position is worth remembering. A fish hovering above the bottom may not show its barbels as clearly as one actively searching the sand. Watching behavior can reveal an identification feature that a quick glance misses.

Where Wekeʻa Live

Yellowstripe goatfish use sandy and silty areas around reefs, including sheltered reef habitats and outer reef slopes. Fishes of Australia also records juveniles in estuaries and harbors.

Rather than searching only among coral branches, look at the open bottom beside the reef. Sand can seem empty compared with a coral head, but for a bottom-feeding fish it is a place to search for a meal.

What Do Wekeʻa Eat?

Hawaiian educational sources list crustaceans and worms among the foods eaten by wekeʻa. Their barbels help them investigate the bottom for these small animals.

This is a different feeding strategy from that of algae grazers such as Lauʻipala, the yellow tang. Both may use habitats around the reef, but they are looking for different kinds of food.

Schooling by Day, Searching by Night

Reef Life Survey describes yellowstripe goatfish gathering in large, relatively inactive schools during the day before moving out to forage at night. Seeing a school resting above the bottom therefore gives a different view of the species from watching individuals feeding.

Schools can also contain similar-looking species. Reef Life Survey notes that yellowstripe goatfish sometimes school with goldstripe goatfish, Mulloidichthys vanicolensis. The latter lacks the yellowstripe goatfish’s characteristic black side blotch, making that marking especially helpful when visible.

Look Closely, Give Them Space

Observe without chasing or feeding fish, and avoid disturbing the bottom to make them move. A little patience gives you a better chance of seeing the barbels, the changing prominence of the dark spot, and the way fish position themselves within a school.

Meet the Fish Behind the Cards

Wekeʻa appears on the king of clubs in our Hawaiian Reef Fish Playing Cards. Watercolor illustrations paired with Hawaiian and English names bring marine discovery to the table. Explore the full deck to meet more fish behind the cards.