A new quantitative plankton net

摘要: The apparatus described in this paper was constructed for the purpose of sampling zooplankton standing crop ocean a quantitative manner.A meter is described, which will record both depth and amount water net filters as it hauled vertically through water. records on smoked glass cylinder.The mounted brass drum positioned front silk filtering section net. In long canvas sleeve carries throttling rope closes by Nansen method.Calibration done using reversing thermometers lowering to series suitable depths. Flow calibration easily accomplished field towing without net.The method smoking cylinders taking photographic them described.From possible study complete behaviour below water—what range has fished, how much clogging occurred, closure, etc