Category Archives: Activities

A maritime mystery

A Saildrone research vehicle collecting data off the coast of Hawaii

Back in May, I saw this orange boat a fair distance from shore, off the South Kohala coast. I knew it wouldn’t be a good photo, but I thought I’d be able to identify what it was from it. I was mistaken. I did some searching but turned up nothing. I put it to the side and kind of forgot about it.

Then, late last month, I was on the BBC website and there was a photo of a craft so similar, it had to be connected. The article (here) was about how seafaring drones are being used to collect data to help scientists figure out why some hurricanes become so dangerous, so fast. These drones operate without crew and are equipped to gather data from both the ocean and the atmosphere.

The company making the drones is called Saildrone, and I emailed them to ask about what the vessel I’d seen was up to. I received an unbelievably prompt response saying that the University of Hawai’i at Mānoa was using three drones around the state to collect information about climate change and ocean acidification and its effect on the health of the waters around Hawaii (here). It was also pointed out that since the drones carry no cargo or crew they are more properly called vehicles rather than vessels!

Spotted Coral Blenny and Stocky Hawkfish

A Spotted coral blenny and stocky hawkfish in the waters off Hawaii

These are a couple of fish that spend a good deal of their time sitting, stationary, on coral or rocks. The similarity ends there.

The hawkfish is a predator, waiting for small fish or crustaceans to come within range. The blenny feeds solely on living coral. And while this blenny is probably an adult at about 6 inches long, the hawkfish can grow to twice that size.

Not all it’s quacked up to be

A decoy duck in the waters off Hawaii
Marine growth on a decoy duck in the waters off Hawaii

On a recent swim, the most notable sighting was this duck, bobbing serenely in the water. It took a while to realize that its calm demeanor owed nothing to its personality, but all to its construction. The duck was a decoy, and a well made one, I thought. A dip under the water revealed no legs, but a good amount of marine growth, indicating it had been bobbing along for some time.

Passing through

Spinner dolphins in the waters off Hawaii

Yesterday, when I went swimming, the swells rolling in were larger than expected, and the visibility in the water, worse than expected. Consequently, it wasn’t a banner swim until I popped my head out of the water and saw spinner dolphins heading my way.

Spinner dolphins in the waters off Hawaii
Spinner dolphins in the waters off Hawaii

I reckoned there were at least 60 or 70 dolphins in the pod, but I suspect there the number was closer to 100. I count more than 25 in the top photo and that was one group going by on one side. The traffic was continuous on both sides, and below, for several minutes.

Spinner dolphins in the waters off Hawaii

The dolphins weren’t hanging around, but zipped by, heading for their daytime resting spot. Several minutes later, a much smaller group passed by, traveling at a more sedate speed. I’m not sure why that was. Sometimes it’s because they’re escorting calves, but I didn’t see any. Perhaps they were just tired and not inclined to get caught up in the rush of the main group.

Spinner dolphins in the waters off Hawaii

Hebrew Cone

A Hebrew Cone in the waters off Hawaii

For some reason, on many recent swims I’ve seen a variety of cones in the water. Cones are marine snails and many have a venomous sting, which can be dangerous to humans, though not likely fatal.

The Hebrew Cone gets its name from its distinctive markings, which supposedly bear something of a resemblance to Hebrew letters. It’s quite common here, though this was the first one I’ve seen. Apparently, the largest Hebrew Cones are found in Hawaii, though that only means a length of around 2.5 inches, which this one might have been close to.