Postcard from the Reef – Bigeye

Common Bigeye (Heteropriacanthus cruentatus)
Common Bigeye (Heteropriacanthus cruentatus) in a cave on the Kohala Coast
Shine a dive light into any small cave along a Hawaiian coast and you will see a swirl of red fish… Soldierfish, squirrelfish and bigeyes. They are all some shade of red and all possess large eyes for foraging in the night. During the day these fish shelter in caves, crevices and overhangs. There are a couple dozen species, identifying each is a bit of a challenge…

Postcard from the Reef – Leaf Scorpionfish

Dave spotted it, what appeared as a piece of debris lying in the coral. A closer look showed this ‘debris’ has fins. It is a Leaf Scorpionfish crouching low in the coral. I have seen a few members of this interesting family lately, often challenging to spot.

Leaf Scorpionfish
Leaf Scorpionfish (Taenianotus triacanthus) crouched in finger coral

Postcard from the Reef – Fine-Spined Urchin

Fine-Spined Urchin (Leptodiadema purpureum)
Fine-Spined Urchin (Leptodiadema purpureum) in a cave at 30ft depth, Kohala Coast

A pretty urchin found in a cave. Apparently this is the rule for these urchins, found under rock and rubble when small, larger individuals found in caves or deep crevices with an active aversion to light. Most urchins move pretty slowly, the motion barely perceptible. This echinoderm was moving, tube feet furiously propelling it along the cave roof as it tried to avoid our lights.

Postcard from the Reef – Caving

the Kona Coast is riddled with caves, old lava tubes, wave carved openings in ancient sea cliffs, or simple small openings in the coral. The caves are high on many diver’s priority lists when exploring the reef. In these caves you find many species that hide during the light of day, lobsters and night active fish. The larger caves offer a sheltered environment, safe from the pounding winter surf. The walls are covered with colorful sponges and the nudibranchs that feed on them.

If there is a cave, you will probably note my fins disappearing into it.

Caving
Olivier Martin exploring a cave at O’oma

Postcard from the Reef – Hawaiian Spiky Sea Cucumber

These sea cucumbers are well known to divers and can be found in the local guide books. There is no scientific name, the species has never been properly described. An odd state of affairs for a relatively common critter. As for the name? I could come up with a few other common names that seem to describe the appearance. However, naming a species after a pile of doo-doo is not generally acceptable.

Hawaiian Spiky Sea Cucumber
Hawaiian Spiky Sea Cucumber (Stichopus sp.) at 100ft depth off O’oma, the species is well known but undescribed in the literature