Triton’s trumpets are snails and their shells are the second largest in the Indo-Pacific. They can attain a length of 20 inches. The colorful shells are also quite beautiful, especially when they catch the light filtering down from above.
These snails eat echinoderms including Crown-of-Thorns stars, which feed on corals.
This is the molted shell of an a’ama crab, seen on the North Kohala shore. A’ama crabs are numerous around the Big Island and they scuttle away when disturbed. But while these crabs are black, their molted shells turn red in the sun, as this one has.
A bright-eye damselfish guards its territory, which includes this red pencil urchin, against intruders.
Back in the fall of 2014, Hawaiian waters experienced temperatures up to 86°F. This very warm water resulted in a major coral bleaching event statewide. Since that time, water temperatures have been in a more normal range and the coral has stabilized and even shown signs of recovery in places.
In August of this year, the National Oceanic and Atmospheric Administration (NOAA) issued a warning that another major bleaching event was likely to happen this fall. Last month, NOAA reported that bleaching was already occurring. And I’ve noticed that the water does seem warmer, sometimes disturbingly so.
Because of the bleaching threat, I’ve been looking at the coral when I go snorkeling. There are a few very white patches, but by and large it doesn’t look too bad. This patch of purple coral still looked quite healthy and was host to a saddle wrasse (lower photo) and three unidentified fish (above).
A little snapshot of things tucked into the rocks along the Big Island. There’s a red pencil urchin and blue-black urchin, a patch of cauliflower coral, and a cowry, probably a reticulated cowry. And if you look closely, there’s a bright-eyed damselfish swimming between the coral and red pencil urchin.
Whitemouth moray eels can squeeze into the tightest spots on the reef and are often seen with just the head sticking out. They’re easy to identify with their bright white mouths, which they’re constantly opening and closing. While this activity looks somewhat menacing, they’re actually forcing water over their gills in order to breathe. That’s not to say that, if you waggle your finger in the face of an eel, it won’t bite it off so, as with most creatures in the water, it’s best to keep at a reasonable distance and be respectful of them.
Achilles tangs are surgeonfish, with a scalpel near the base of the tail, in the aft end of the large orange-red spot. They’re quite common in shallow waters near the surge zone. This one is passing over a patch of coral, dotted with red pencil urchins.
I like this photo for the three layers of different-colored underwater landscape. There’s the blue-green of the bottom, the pale, splotchy intermediate layer of rock, and the red-hued outcropping in the foreground. And complementing everything is the back end of a Christmas wrasse, disappearing from view.
