Swimming depths of the giant jellyfish <Emphasis Type="Italic">Nemopilema nomurai</Emphasis> investigated using pop-up archival transmitting tags and ultrasonic pingers |
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Authors: | Naoto Honda Toshihiro Watanabe Yoshiki Matsushita |
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Institution: | (1) National Research Institute of Fisheries Engineering, Fisheries Research Agency, Kamisu Ibaraki, 314-0408, Japan;(2) Headquarters of the Fisheries Research Agency, Yokohama Kanagawa, 220-6115, Japan;(3) Faculty of Fisheries, Nagasaki University, Nagasaki Nagasaki, 852-8521, Japan;(4) Present address: Japan Sea National Fisheries Research Institute, Fisheries Research Agency, Niigata Niigata, 951-8121, Japan;(5) Present address: National Research Institute of Fisheries Engineering, Fisheries Research Agency, Kamisu Ibaraki, 314-0408, Japan |
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Abstract: | The swimming depths of 12 individual Nemopilema nomurai with bell diameters of 0.8–1.6 m were investigated using pop-up archival transmitting tags and ultrasonic pingers, and the
validity of the research method was evaluated. The N. nomurai studied frequently showed vertical movement, with the swimming depth ranging from 0 to 176 m, The mean swimming depths of
most individuals were less than 40 m. The swimming depths of N. nomurai in the northern Japan Sea in the winter were mostly deeper than those of this species in the southern Japan Sea in the autumn.
This result suggests that the range of the depths almost depends on the vertical structure of the ocean. Swimming depths during
the nighttime were significantly deeper than those during the daytime. More specifically, during the daytime, the swimming
depths in the afternoon tended to be shallower than those in the morning, while during the nighttime, the swimming depths
after midnight were deeper than those before midnight. |
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Keywords: | Circadian rhythms Giant jellyfish (Nemopilema nomurai) Pop-up archival transmitting tag Swimming depth Ultrasonic pinger Vertical movement |
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