How many Arc-eye Hawkfishes can you fit in a head of Cauliflower Coral? I count six here, though there could be more, and who knows what else besides. Corals like this offer vital shelter for small fish and other creatures seeking to avoid the many predators out hunting.
Yesterday, I posted photos of a manta ray encounter (here), noting that, if fins are seen in the water, manta rays are one likely reason. After the post went live, I went for a swim. I didn’t see anything unusual and was heading back in when I turned and saw fins in the water. This time, they were clearly dolphin fins.
Sometimes, the dolphins zip by as if they’re late for an appointment, but these were proceeding in a very leisurely fashion, so I thought I’d swim back out a ways and see if any came to check my out. As I swam, I’d pop up to see what was going on. Quite a few dolphins went by in small groups, but I saw more were following.
Luckily, one of these groups was traveling closer to shore than the others and as I ducked my head underwater, I saw them approaching. The lead dolphin did veer in my direction, but carried on its way, followed by a trio that maintained impressive formation as they passed. The whole encounter lasted just a few minutes, but I was thrilled to see them and happy to get a few decent photos.
A couple of days ago, my wife and I arrived at our usual snorkeling spot and, when we got out of the car, she spotted fins in the water. Fins generally belong to dolphins, sharks or rays. Each has a different look and these had the look of manta ray wingtips. We could see that there were at least two mantas in the bay. Sometimes, especially with dolphins, the fins will be on the move as the bearers move along the coast. These mantas did not seem in a hurry to go anywhere, but were just puttering around the bay. We hustled down to the water and swam off in the general direction of where we’d seen activity.
We were swimming along when I saw the first manta heading towards me. I stopped and started taking photos. It came fairly close before veering away and heading back the way it came. Then it turned, came back past us and continued on its way.
When it became clear it wasn’t coming back we continued on our way. A little farther along we saw the second manta. It was doing barrel rolls and then came our way. Again, we stopped and watched. This one was more curious, passing by quite close and then looping around several times. Sometimes it went a fair distance away and we’d pop up and follow its progress when it was close to the surface.
Eventually, it seemed to head off in the general direction of the other manta. We lost track of it and popped up in the water to decide what to do next. When I ducked under the water again and turned around I saw the manta again. It made a couple more passes before heading out towards deeper water.
I saw this Undulated Moray Eel out in the open recently and, rather than dart for shelter, it remained where it was opening and closing its jaws. While this looks threatening, it’s typical of most eels, the purpose being to push water over its gills, the equivalent of breathing. However, that’s not to say it’s a good idea to dive down and interact with the eel.
My fish book describes the Undulated Moray Eel as “one of the nastiest.” Its narrow jaws hold three rows of teeth, one running down the middle of its mouth. It’s usual prey includes small fish, but this eel was accompanied by a changing group of fish, and neither seemed too bothered about the other.
In Hawaii, this eel is often called the chainlink eel, for obvious reasons.
A tangle of floating fibers creates an abstract pattern in the water.
I spotted this Jeweled Anemone Crab scuttling over some very uneven rock and coral, but it was still able to move at a pretty good pace. The Jeweled Anemone Crab is a hermit crab, meaning it lives in a snail shell, either one it found unoccupied, or one from which is evicted the current tenant.
This one looks to have found a colorful shell, but looks are deceiving. The shell isn’t visible at all, because it’s covered by at least four large anemones! These are Calliactis polypus anemones. They give the crab some protection because, if disturbed, they shoot out stinging threads. In return, they get transportation and possibly scraps of food from the crab.
I was snorkeling recently when I saw this strange tubular stringy thing. That’s not a scientific term. My first thought was that it was a Chained Salp, a tunicate that is a colony of individual Salps. But this one seemed a bit different. There was the main tube, but also thinner strings hanging off it.
I started taking photos, which was a bit of a trick in the lumpy swell. I wasn’t worried about getting too close since Chained Salps are harmless. I wasn’t worried until I got too close and realized I’d been stung on the hand by some those tendrils! That was enough for me and I headed to shore.
Back at the house, I couldn’t identify it in my book so I emailed a fellow snorkeler who is well-versed in these sort of things. She had encountered these before and identified it as a Siphonophore (Thanks, Wendy.). Like the Chained Salp, this is a colony of individuals, but unlike the harmless salps, siphonophores have stinging tentacles which they use to catch prey.
Possibly the best known Siphonophore is the Portugese Man-Of-War, one of which had stung a fellow snorkeler just a few days earlier. His wounds were very painful, but I got off easily, with just red welts and a mild burning sensation for a couple of hours.
A pair of Fourspot Butterflyfishes disturbed a pair of Arc-eye Hawkfishes perched in a head of Cauliflower Coral, as they often do. The coral head is doing OK, but areas of it have died off, probably during one of the coral bleaching events that have happened in the past few years, where the water gets too warm.
I can get chilly fairly easily when I go swimming, but for me, it’s more distressing when the water feels oddly warm because I know this is bad news for the corals.
Graham's Island 