最新精品国产av资源网_女人十八毛片一级毛片免费看_国产美女一级a在线_综合欧美在线观看少妇_铁牛tv超短旗袍自慰喷水_不卡人妻无码中文字幕_狼友国产微视精品一区二区_337p欧洲亚洲日本大胆色噜噜_免费无码特黄视频_一级a爱片免费视频大全

The High Speed Plankton Collector ”Nackthai” has been developed to catch mobile organisms with increased efficiency. It consists of a 150 cm long net bag, protected by a robust but light-weight tube frame with conical nose of 20 cm inlet diameter. Three plastic fins guarantee for stable orientation during the operation.

A 22 kg V-Fin depressor is used to create negative lift at the instrument. For easy retrieval the sample is concentrated inside a removable plastic net bucket with side window (covered with sieve gauze).

The “Nackthai” can be used together with one Mechanical Flow Meter to measure the filtered water volume. No bridles or other towing devices precede the mouth of the net so that organisms are not being “warned”. The mouth opening of the net is unobstructed. Due to the low weight of the frame the “Nackthai” can easily be handled even under rough weather conditions. It can be towed at up to 8 knots.