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So tempting was the artificially generated elec- tric field, that when a piece of odor- producing fish was placed a short distance from the electrodes, the sharks, although attracted by the odor, continued to dive at the electrodes rather than at the fish. Electricity clearly seemed to be the medium the sharks were using to find their prey. 78 As a final proof Kalmijn simu- lated the presence of the flounder in the tank by passing a weak electri- cal current between two electrodes buried in the sand. Motivated by a few drops of fish extract spread in the tank, the sharks charged at the electrodes as if they were the real prey. Responding again and again when swimming over the electrodes in their search for food, the sharks left the site only after finding it really contained none. The fields produced by metals carried or worn on the body, scuba gear^for example, are usually even stronger.
Nicholson 104 The Market 106 Additional Reading 108 Announcements 1 10 February No. Stephen Pastner 32 Sky Reporter: What Are Comets Made Of? To observe the animals' feeding behavior, we had designed a non- metallic field setup that would reproduce our laboratory tests in a natural setting.
Instead they swam over the agar chamber with- out showing the slightest interest in the food. To establish beyond a doubt that the electric sense was the means by which the sharks had located the live flounder, the agar enclosure was covered with a plastic wrap.
If odor were to come through, the sharks would find the bait within minutes.
They perceive these movements with microscopically small organs in the skin along a visible band, called the lateral line, that runs the length of the body.
Sharks not only have a keen sense of smell but, like most aquatic animals, they are also sensitive to minute movements in the water.