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動物プランクトンの種別分布量を把握するため曳航型レーザー式プランクトンカウンターLOPCのデータ解析法を検討した。2007 年 4 月昼間に北海道噴火湾の 12 点においてリングネットに装着した LOPC を鉛直曳航した。採集物のカイアシ類と端脚類の体サイズは一部重複したがLOPC の検出粒子のサイズ組成は種別湿重量組成と同様の変化傾向を示した。LOPC を用いた種別計測のためには動物プランクトンの種ごとの検出粒子の計測特性を明らかにする必要があると考えられた。　　　 The Laser Optical Plankton Counter (LOPC) has been used to evaluate abundance structure of micro-organisms like a zooplankton speedy. The sea experiments were conducted at twelve stations near Funka Bay, Hokkaido to examine the performance of the LOPC for in situ measurement of multispecies aggregation of zooplankton. The LOPC was mounted with ring net (80 cm mouth diameter) and towed vertically. Size and volume composition data of LOPC and net samples were compared each other. The particle size composition detected by the LOPC showed similar pattern with wet weight composition of copepods and amphipods in net samples. However, the ranges of equivalent spherical diameter of these species were overlapped. To measure in situ zooplankton community by species using LOPC, the measurement properties of each particle by specie should be identified and discriminated from LOPC data

Performance of laser optical plankton counter (LOPC) for in situ measurement of multispecies aggregation of zooplankton