Diving the Kona Coast: Honaunau Bay

Showing posts with label Honaunau Bay. Show all posts

Thursday, May 28, 2015

Swimming Nudibranch

Nudibranchs are the marine equivalent of a garden slug. However, unlike terrestrial slugs, nudibranchs can often be quite colorful and attractive. The largest of the Hawaiian nudibranchs is the Spanish dancer (Hexabranchus sanguineus) which can sometimes achieve a length of over one foot.

While most nudibranchs crawl across the substrate, the Spanish dancer, when alarmed, can swim through the water column by flexing and extending its body in an undulating fashion. In doing so, its extended mantle waves rhythmically much like a flamenco dancer's skirt!

Thursday, May 21, 2015

Sleeping Sharks

There have been a lot of whitetip reef sharks (Triaenodon obesus) in Honaunau Bay over the last couple of months. One morning I found eight of them crammed tightly together under a small ledge in shallow water. In addition to the shark's head in this photo, you can see the back of one and the tail of another.

Sunday, May 17, 2015

Commerson's frogfish seen at Honaunau

A few months back I encountered this medium-sized Commerson's frogfish (Antennarius commerson) at the north end of Honaunau Bay. I was able to get some decent photos including this one of it swimming.

Frogfish aren't built for swimming but are wondrously well adapted for sitting still, so to see this one swim for a short distance was interesting. While sorely lacking in either speed or endurance, the frogfish has an ingenious form of propulsion wherein it forces jets of water from ducts under its "arms" (pectoral fins) to give it an extra boost.

Also kind of cool (to me) is this final shot where you can see the thin spine sprouting from the forehead with a bushy "lure" at the end. The lure is called an esca and is jiggled by the frogfish to lure unsuspecting prey close to its generously-sized mouth. And thus, the Circle of Life remains unbroken. Hakuna Matata!