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Preliminary results about the impact of the noises from submersible<br />
and <strong>ROV</strong> on biological observations<br />
Misumi AOKI <br />
Submersible and <strong>ROV</strong> (Remotely Operating Vehicles) move while emitting noises such as light, sound (vibration),<br />
and irregular current. It is obvious that those noises give some effects on the biological observations about behavior of<br />
fishes. If there are appreciable differences between submersible and <strong>ROV</strong>, observers should take those differences into<br />
consideration.<br />
At the beginning, the components of submersible and <strong>ROV</strong> were reviewed which include propulsions and acoustic<br />
instruments. The most conspicuous differences are the number of propellers and the power of propulsive. The operational<br />
methods of propulsion is also different between submersible and <strong>ROV</strong>. The difference depends on the source of<br />
power; submersible uses battery while, <strong>ROV</strong> is supplied electric power from the surface ship.<br />
Shinkai # diving was carried out to observe the behavior of fishes on th October . The lights, propellers<br />
and pumps were turned off intentionally during the observation. And the minimum acoustic instruments were<br />
used. The result shows that there is considerable relationship between the volume of noises and the number of eels. Eels<br />
are affected by lights.<br />
Keywords : biological observation, noise, submersible and <strong>ROV</strong><br />
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Marine Science Department, Nippon Marine Enterprises, Ltd.
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Table Differences between submersible and <strong>ROV</strong>.<br />
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Table - Description about propellers of submersibles.<br />
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Table - Description about propellers and voltage of <strong>ROV</strong>.<br />
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Table Comparison about acoustic equipments<br />
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Fig. A marker with bait.<br />
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Fig. The Acoustic tracking data of the Shinkai dive .<br />
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Fig. Layout of the lights on Shinkai <br />
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Fig. Equipments that makes acoustic noise.<br />
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Table The process of experiment and results.<br />
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Fig. The relationship between the variation of light and sound and the number of fishes and eels.<br />
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Fig. - An eel.<br />
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Fig. - Bathyraja sp.<br />
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Fig. - A rattail.<br />
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Fig. - Paralomis sp.<br />
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Fig. - A rattail.<br />
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Observation log.
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Theragra<br />
chalcogramma"<br />
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