Echeneis naucrates
sharksucker

Sharksuckers, also known as remora, are commonly found in all warm seas. Sharksuckers have been found in the Western Atlantic, from Nova Scotia, Canada through Bermuda and the Gulf of Mexico, to Uruguay. They are found in the Mediterranean Sea. Their presence has also been reported in the Pacific Ocean, north to San Francisco, and Indian Ocean (Tarleton 1903).

Echeneis nacurates are often present in shallow inshore brackish areas, as well as around coral reefs. They are found at depths ranging from 20-50 meters, which is where the coral reefs are located (Humann 1994).

There have also been sightings of E. nacurates near Long Island, New Jersey, Massachusetts, and traveling up the Hudson River attached to a host (Smith 1997).

Echeneis naucrates can be easily spotted due to the sucking disc on top of its head. Its sucking organ consists of numerous pairs of crests, which originated from a highly modified spiny dorsal fin. This sucking disc is capable of producing a strong vacuum that the species uses to attach to their hosts. The fish is usually 11 or 12 times as long as it is wide, and about five and a half times the length of its head. The slim body usually has a dark stripe on the side with narrower pale edges (Field 1998). The sharksucker's tail is pointed, and the jaw is protruded. Echeneis naucrates' pectoral and ventral fins are dark in color, and the belly is a dark brownish color. The dorsal and anal fins are black, and are outlined with a lighter shade. Sharksuckers can reach approximately 100 centimeters in length, yet smaller ones are found more frequently. Adult females and males are difficult to distinguish. After the formation of the sucking disc, the young start to resemble the adults (Bigelow 1953).

Echeneis naucrates commonly swim in groups. Sharksuckers are found attached tightly to their hosts from the beginning of their lives (i.e. sharks, snappers, dolphins, turtles, and whales) (Hoese 1977). They are dependant on other organisms in the oceans for their own survival. In this commensal relationship, the E. naucrate's host is not harmed, while the fish benefits greatly. Not only does the fish obtain its food from the host, but it can also save energy because the host is the mode of transportation. Sharksuckers are poor swimmers and lack a swim bladder, they are therefore called "hitchhikers," because they hitchhike rides on other aquatic organisms. Using their modified dorsal fin as a sucking disc, sharksuckers attach themselves onto either the body or the gill area of the host (Debelius 1997).

Sharksuckers have no known predators.

The usual diet of sharksuckers is composed of scraps of food that are lost or rejected by the large host animal it is attached to. The fish also feed on small crustacean parasites that invade the skin of the host, and supplement their diet with other free living small crustacea, fishes, crabs and squid (Field 1998).

In captivity, the fish usually remain stationary on the bottom with the head slightly raised, and will rise to the surface to take pieces of clam or fish from the hand (Tarleton 1903).

Sharksuckers attach with their powerful sucking disc to the bottoms of boats and occasionally to swimmers, causing damage to the boat and maybe even sinking it if the damage is severe enough. Even though very few instances were reported where Echeneis naucrates attached to humans, one can imagine how extremely painful it would be to have the numerous sharp ridges of the sucker clinging onto the human body (Debelius 1997).

In the past Echeneis naucrates have been used as an aid in fishing. The fishermen tied lines to the remora and then released them into the deep sea. Since sharksuckers are always on the lookout to attach to a host, they behaved in the same matter when the fishermen dropped them into the water. When the remora found a suitable host and attached to it, the fishermen would haul the line, pulling the sharsucker along with its host onto land. Using E. naucrates as bait is a very intelligent and quick way of capturing bigger edible fish that the remora clings to. This benefits humans because normally hard-to-catch sea organisms are acquired easily (Humann 1994).

Echeneis naucrates are not listed in IUCN, CITES appendices, or the United States Endangered Species Act list.

Sharksuckers are very common in various oceans. They interact with many other organisms and depend on them for survival (Tarleton 1903).

Sharksuckers were well known to the ancient Greeks, who greatly disliked them. They believed that the Echeneis naucrates had mysterious and magical powers, and were capable of slowing down or even stopping their ships (Debelius 1997).