ADW: Remora remora: INFORMATION
It has been suggested that the relationship is symbiotic since the Remora can The Remora clings to a host, such as large sharks, sea turtles, bony fishes, rays. The remoras /ˈrɛmərəz/, sometimes called suckerfish, are a family (Echeneidae) of ray-finned They are commonly found attached to sharks, manta rays, whales, turtles, and dugongs (hence the common The relationship between a remora and its host is most often taken to be one of commensalism, specifically phoresy. Symbiotic relationships among marine animals are not at all unusual in the wild, but the shark and remora relationship is surprisingly benign!.
A lull ensued, after which more sharks began to drift in from down-current.Grey Reef Sharks and Remoras
One was another elderly female visitor, and the stuffed remora, who had left 15 minutes before, was reclining on her head, looking just as stupefied as before! Evidently, in the interim, the two shark visitors had passed close enough to each other for the remora to have changed sharks, like a person changing planes. Displaying preferences This and other similar observations, suggested that remoras distinguish between individual sharks and have preferences.
Perhaps a remora who usually remained with the same shark would learn its habits, and adjust its lifestyle accordingly, rather than being subject to continual surprises and unwelcome displacements with strange sharks. Certain remoras remembered me over long spans of time, and they appeared to know individual sharks too. In spite of their lethargic appearance, they were alert and making decisions flexibly according to the situation. Early in my study, a remora arrived with a group of sharks that had just come to the lagoon from the ocean.
He was attached to the chin of a female shark who kept trying to dislodge him. When she succeeded, he flew first after one shark, then another, yet did not join any of them. When they left, he came flitting back to where some fish scraps lay, and there he waited, moving around in apparent agitation.
Every so often, he swam a few meters in one direction, returned, and after a while, took a similar foray the opposite way. Time passed while we waited for the sharks to return. When at last a shark appeared, scarcely within visual range, the remora saw it and went winging after it, his fins a blur.
But he did not catch up to the shark, and soon returned to roam around in my vicinity, sometimes going away in one direction or another to look more widely. Eventually, he came tentatively over to me, and flowed up my leg and around my body, trying to stay out of sight as I bent to stroke him. I fed him some crumbs from a scrap, and he eagerly ate until he was full. Then he settled on my leg and eventually attached himself while I roamed around looking into the coral crevices. After half an hour, when no sharks had returned, I tore up a fish head in hopes of attracting some back for him, and left.
It was not the only time that a remora appeared to become distressed due to losing his shark. In general, each fish seemed to remain aware of the movements of the shark with whom he had come, in order to be ready to leave with it.
Each remora was different.
Remoras: Shark Companions
Some seemed to consider me a welcome companion right away, while others would not come near. Polite companion One evening after a shark session, I was feeding the fish when an exceptionally large, white remora arrived with a group of visiting blacktips. I was shredding meat from a fish head, and he put his head deep down inside, and grabbed bites beside my fingers. I was concerned about accidental bites, but he behaved as if he was used to eating with a person with skin the color of the meat, and never made a mistake.
Remora Fish and Shark Symbiosis Relation ship by X1* Havok on Prezi
Soon, he was stuffed. Once, he was attracted away by one of the young sharks, who was circling nearby close to the surface, but he quickly left her, returned to me, and rejoined the same visiting shark with whom he had arrived, the next time she passed.
He reappeared about a month later when it was nearly too dark to see, and remembered me. He flitted back and forth in front of my mask, then around my neck and torso. I had nothing at hand, however, and ignored him at first, but after a few minutes, when he went to try to get a few crumbs from a nurse shark, I searched out a fish head that still had meat in it.
When he saw me, he rose with me to the surface, and ate with his head beside my fingers as before.
Physiology[ edit ] Research into the physiology of the remora has been of significant benefit to the understanding of ventilation costs in fish. Remoras, like many other fishes, have two different modes of ventilation.
Ram ventilation  is the process in which at higher speeds, the remora uses the force of the water moving past it to create movement of fluid in the gills. Alternatively, at lower speeds the remora will use a form of active ventilation,  in which the fish actively moves fluid through its gills. In order to use active ventilation, a fish must actively use energy to move the fluid; however, determining this energy cost is normally complicated due to the movement of the fish when using either method.
As a result, the remora has proved invaluable in finding this cost difference since they will stick to a shark or tube, and hence remain stationary despite the movement or lack thereof of water.
Remora - Wikipedia
Experimental data from studies on remora found that the associated cost for active ventilation created a 3. Concerning the latter case, remoras were used as an outgroup when investigating tetrodotoxin resistance in remoras, pufferfish, and related species, finding remoras specifically Echeneis naucrates had a resistance of 6.
A cord or rope is fastened to the remora's tail, and when a turtle is sighted, the fish is released from the boat; it usually heads directly for the turtle and fastens itself to the turtle's shell, and then both remora and turtle are hauled in.
Smaller turtles can be pulled completely into the boat by this method, while larger ones are hauled within harpooning range. This practice has been reported throughout the Indian Oceanespecially from eastern Africa near Zanzibar and Mozambique and from northern Australia near Cape York and Torres Strait.