Zooplankton analysis in fish pond water – Video

The video is a part of a training program demonstrating the analysis of zooplankton in a fish pond. As shown in the video, a plankton net is used in the sampling procedures. The mesh size of the net determines the size range of the plankton trapped. A-80μm net will retain small zooplankton such as rotifers whilst allowing most algae and protozoa to pass through. Depending on the target zooplankton, the mesh size of the plankton net may range from as small as 80μm to as large as 300 and 500 µm. Similarly, the quantity of sampled water which is poured in the plankton net is related to the fertility level of pond water; while 40-50 liter may could be required in low-fertile pond, ten liters will be sufficient in case of high fertile waters. If quantitative sampling is desired, the volume of sampled water should be recorded to relate the number of organisms to a unit of water. This conical plankton net is made from nylon ending by a sample bucket. Typically, the net is held halfway out of the water, sampled water is poured through the net while assuring that all zooplankton is collected in the bucket before its preserving and analysis. After each use, the net is thoroughly washed with water and stored in the dark.



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