Vertical distribution of <Emphasis Type="Italic">Todarodes pacificus</Emphasis> (Cephalopoda: Ommastrephidae) paralarvae near the Oki Islands,southwestern Sea of Japan |
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Authors: | Jun Yamamoto Tsuyoshi Shimura Ryosuke Uji Shinya Masuda Shuyo Watanabe Yasunori Sakurai |
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Institution: | (1) Field Science Center for Northern Biosphere, Hokkaido University, 3-1-1 Minato-cho, Hakodate, Hokkaido 041-8611, Japan;(2) Tottori Prefectural Fisheries Experimental Station, 107 Takenouchidanchi, Sakaiminato, Tottori 648-0046, Japan;(3) Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1 Minato-cho, Hakodate, Hokkaido 041-8611, Japan |
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Abstract: | The diel vertical distribution patterns of Japanese common squid, Todarodes pacificus, paralarvae were examined using a Multiple Opening Closing Net and Environmental Sensing System (MOCNESS) in the southwest
Sea of Japan near the Oki Islands (Japan) during five late-autumn surveys in 1998–2002. A total of 1,511 paralarvae ranging
in mantle length (ML) from 0.7 to 7.3 mm were collected at 63 of the 68 stations surveyed. Most (84%) were collected above
75 m depth and in the mixed layer. The vertical distribution patterns varied little between day and night. Hatchling-sized
(<1.0 mm ML) paralarvae were abundant at 0–25 m depth, and paralarval ML increased with increasing sampling depth. Our results
suggest that T. pacificus paralarvae do not exhibit large diel vertical migration patterns, but as they increase in size, paralarvae gradually descend
in the water column and the variability in depth increases with ontogeny. |
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