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JPR Advance Access originally published online on May 6, 2004
Journal of Plankton Research 2004 26(8):851-857; doi:10.1093/plankt/fbh081
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Journal of Plankton Research Vol. 26 No. 8 © Oxford University Press 2004; all rights reserved

Summer vertical distribution of paralarval gonatid squids in the northeast Pacific

John R. Bower* and Shogo Takagi1

Northern Biosphere Field Science Center, Hakodate Branch, Hokkaido University, Japan and 1 Oshoro Maru, Faculty of Fisheries, Hokkaido University, 3-1-1 Minato-Cho, Hakodate, Hokkaido, 041-8611, Japan

* Corresponding Author: akaika{at}fish.hokudai.ac.jp

Received August 21, 2002; accepted in principle January 27, 2004; accepted for publication March 24, 2004; published online May 6, 2004

The vertical distribution patterns of paralarvae from several abundant cephalopod taxa were examined from depth-stratified tows in the northeast Pacific (44–56°N, 145–165°W) during three summer surveys in 1999–2001. A total of 309 cephalopods representing 10 taxa in three families were collected. Gonatid squids composed 97% of the total catch, and the most numerous taxa were Berryteuthis anonychus (59% of the total catch), Gonatus spp. (21%) and Gonatopsis borealis (17%). B. anonychus and Gonatus spp. were both most abundant in the upper 20 m; catches of both taxa varied significantly with depth and were significantly higher above the thermocline than in and below the thermocline. Gonatopsis borealis was collected mostly between 20 and 50 m, and catches were significantly higher in the thermocline than above and below the thermocline. Paralarvae of the three major taxa showed no evidence of diel vertical migration. Mantle lengths of Gonatus spp. and G. borealis each varied significantly with depth, and Gonatus spp. showed a strong positive correlation between mantle length and depth.


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