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北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University >
第69巻 第1号 >

4連ノルパックネットを用いたネット目合いの違いが濾過効率と採集効率に与える影響に関する研究

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Please use this identifier to cite or link to this item:http://doi.org/10.14943/bull.fish.69.1.47

Title: 4連ノルパックネットを用いたネット目合いの違いが濾過効率と採集効率に与える影響に関する研究
Other Titles: Study on Effect of Net Mesh Size on Filtering Efficiency and Zooplankton Sampling Efficiency using Quad-NORPAC Net
Authors: 濵, 斉之1 Browse this author
阿部, 義之2 Browse this author
松野, 孝平3 Browse this author
山口, 篤4 Browse this author
Authors(alt): Hama, Nariyuki1
Abe, Yoshiyuki2
Matsuno, Kohei3
Yamaguchi, Atsushi4
Keywords: Plankton net
Mesh
Zooplankton
ZooScan
Imaging analysis
Issue Date: 7-Aug-2019
Publisher: 北海道大学大学院水産科学研究院
Journal Title: 北海道大学水産科学研究彙報
Journal Title(alt): Bulletin of Fisheries Sciences, Hokkaido University
Volume: 69
Issue: 1
Start Page: 47
End Page: 56
Abstract: To evaluate the effect of net mesh size on filtering efficiency and zooplankton collection efficiency, we developed Quad-NORPAC net equipped four-different mesh sizes (63, 100, 150, and 335 µm). Based on zooplankton samples collected by Quad-NORPAC net at 13 stations off Fukushima during 2-12 June 2016, zooplankton settling volume and wet weight (335 µm) measured, and size and taxonomic data were captured by imaging analysis (ZooScan). As net mesh property, mesh porosity ranged between 22.8% (63 µm) and 45.5% (150 µm). Filtering volumes of four mesh nets were highly correlated (r2=0.97-0.99), while those of 63 µm was greatly lower than the others (i.e. that of 63 µm was factored as 0.598 of 335 µm). Zooplankton collection efficiency, which evaluated an abundance of 63 µm mesh as 100%, ranged for 66.8-120.1% for 100 and 150 µm, while was extremely low (6.5-32.3%) for 335 µm. Zooplankton collection efficiency varied with size and taxa. Thus, collection efficiencies of Gastropoda, Copepoda, Cladocera, and Appendicularia, the smaller-sized taxa (<500 µm in equivalent spherical diameter [ESD]), were substantially low (<10%), while those of Noctiluca scintillans, Cnidaria, and Euphausiacea, large-sized taxa (>500 µm ESD), were relatively high (40-80%). From the viewpoint of filtering efficiency and collection efficiency, within the four mesh sizes, 150 µm mesh net is considered to be sufficient for quantitative collection of zooplankton.
Type: bulletin (article)
URI: http://hdl.handle.net/2115/75200
Appears in Collections:北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University > 第69巻 第1号

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