Category Archives: Activities

Finescale Triggerfish

A Finescale Triggerfish in the waters off Hawaii

According to my fish book, Finescale Triggerfish are rare in Hawaii, except for the west coast of the Big Island. I see one or two most times I get in the water, and when I see them, I try to take photos. Most of the photos are terrible.

Finescale Triggerfish are, by some way, the largest triggerfish in Hawaii’s waters, so they’re not hard to spot, and with their dorsal and anal fins flopping from side to side as they swim, they’re easy to identify. However, they do present problems. For one thing, they’re generally a blotchy grey or brown color so they tend to blend into the background. While they can be seen close to shore, they usually swim nearer the bottom than the top. And they’re skittish. When I do see one nearer the surface, it’s usually seen me first and is headed down and away.

This one was a bit trapped in a relatively shallow area, so I got a few photos, though unfortunately the water was very hazy that day so the quality wasn’t great.

Hawaiian Cleaner Wrasse at work

A Hawaiian Cleaner Wrasse and Whitebar Surgeonfish in the waters off Hawaii
A Hawaiian Cleaner Wrasse and Whitebar Surgeonfish in the waters off Hawaii

Cleaner wrasses establish territories where they remove mucus, parasites, and dead tissue from other fish. These cleaning stations can exist in the same place for years and can have several wrasses performing those services. Their clients can be anything from other small reef fish to eels and sharks.

In these photos, a Hawaiian Cleaner Wrasse services a Whitebar Surgeonfish.

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.