The blacktips and sandbars are called obligate ram ventilators, a fun scientific term that simply means that they have to keep swimming to push oxygen-carrying water over their gills so that they can breathe. The blacktips are pretty easy to identify—their dorsal fin looks like it’s been dipped in black paint. The sandbars—silver, sleek and slicing the water with a tall dorsal fin—are the “sharkiest”-looking of the group.
We also have two species of wobbegongs—Japanese and spotted. Wobbegongs are also known as carpet sharks, partly because their ornate markings resemble an Oriental rug and partly because they lie flat on the shallow reef floor. These are not aggressive sharks, but woe to the wader or swimmer who accidentally treads on one. Wobbegongs are equipped with razor-sharp recurved teeth (for grabbing small prey), and when they bite in self-defense, they hang on. Because their habitat coincides with popular coastal recreational areas, wobbegongs account for more nonfatal shark bites than any other species in their native Australian waters.
The beautifully patterned white-spotted bamboo shark is another carpet shark, distantly related to the wobbegongs. A mere 3 feet long, these sharks prey at night on small fishes and crustaceans, using their small teeth to grab and crush.
“Playful” usually isn’t the first word people use to describe sharks, but it can apply to the zebras. One female likes to swim through the air bubbles expelled by scuba divers cleaning the large habitat. This species is also prolific. Eighty-seven zebra shark pups have hatched at Shedd—86 of them from eggs laid by super mom Cleo. Her offspring have been shared with about 16 other U.S. aquariums. By the way, only the pups have stripes suggestive of zebras. The adult zebra sharks are spotted.
Posted by Karen Furnweger, web editor