1. The collecting methods of zooplanton which have been used in many countries are summarised in this report.
2. They are roughly classified into three types, net method, trap or sampler method, and pump and hose method. Their merits and demerits are pointed out by comparison.
3. The development of the apparatus is indicated by a schema. It explains the processes of the modification of the apparatus.
4. There are many reports of limnological studies in Japan, but from the quantitative view point they are rather few. Also, there are few comparative studies regarding the efficiency of different mesh nets and apparatus in the same waters.
5. There are many quantitative studies of zooplankton in foreign countries. Net, trap and sampler are used for collection, especially those with Muller gause No. 20, mesh 173/inch net.
6. A few examples of the comparative studies regarding the efficiency of plankton net and collecting methods are introduced (Rawson, 1956; Ishida, 1965).
7. The collecting methods of zooplankton are important, but the methods of estimating secondary production must be decided as soon as we can. Therefore, not only the collecting methods, but the work of revealing the life cycle, reproduction, mortality, excretion, respiration, etcf of zooplankton must be performed side by side.
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