Category Archives: Fish

A mackerel scad school draws attention

Mackerel Scad shoal

Mackerel Scad shoal over coralMackerel scad are schooling fish, the kind that make ‘bait balls’ which end up being decimated by large predators. They’re members of the jack family, not that this does them much good. Some of those large predators are other members of the jack family such as greater amberjacks and almaco jacks.

I came across this school not far from shore. There were probably two or three hundred fish in the school and it was fun watching them twirl and circle in harmony. They encircled me, went past and I popped out the other side. It was then I noticed they weren’t alone. One the other side of the school, a medium-sized great barracuda cruised around.

The barracuda came toward me to take a look, but I was clearly less interesting than the scad and it moved away again. The barracuda can be seen in the bottom photo. See if you can spot it.

Mackerel Scad shoal and a great barracuda

Bluefin trevally

Bluefin Trevally

A couple of views of different bluefin trevallies. There are two things I particularly I like about this quite large fish. One is that they’re quite beautiful when the sun catches their blue markings. The other is that they tend to hunt in twos and threes, often times in the company of goatfish, and an eel or octopus. Indeed, if you want to see an octopus, one of the best ways is to watch for trevallies, especially if they’re just stooging around in one area for no apparent reason. In that case, it’s probably because there’s an eel or octopus present that can’t easily be seen.

Bluefin Trevally approaching

Chubs in the surge

Chubs in the surge

These are probably gray chubs, but might also be brassy chubs, or even a mixture of both. The two species look similar and are found in similar locations, in the surge zone. I like to find a safe spot, just outside this zone, and watch the swells roiling in and see chubs and other fish swish back and forth with the swell.

Chubs are quite common and they aren’t shy. They’ll pass quite close, often with a cheerful, engaging look, which makes them a fun fish to encounter.

Pacific trumpetfish and yellow tang

trumpetfish and yellow tang

Pacific trumpetfish have the ability to change their coloration according to their surroundings. In this case, the trumpetfish has turned yellow to blend in with a shoal of yellow tang, one of the most common fish on the reef.

So why bother with this subterfuge? Trumpetfish are predators, feeding mostly on small fish and some crustaceans. Appearing to be one of the crowd allows it to sneak up on unsuspecting prey. And while the very different shape of the trumpetfish might make it seem like it’s prey would be sure to spot it, from the front, which is where the prey is going to be, trumpetfish are very hard to spot.

Pearly soldierfish

pearly soldierfish

pearly soldierfish individualSoldierfishes are nighttime plankton feeders. By day, most rest in sheltered spots such as under ledges, in caves, or in deep holes in the rocks. Pearly soldierfishes area little different in that, during the day, they rest in the open just above the reef.

Like all soldierfish, the pearly soldierfish is notable for its large eyes and reddish coloration, though usually with the pearly sheen that gives it its name.

Redbarred hawkfish

redbarred hawkfish

Redbarred hawkfish, like other hawkfish, spend most of their time perched motionless on a rock or coral head, waiting to dart out at passing prey, usually little fish or small crustaceans. On some fish, the bars are more of a brick red, similar to the color of the red pencil urchin on the left of the photo.