Search for: [Abstract = "The work gives informations how large samples and series and how often shoud be taken in concrete field situations, to obtain maximal credibility \(in estimating quantity of organisms and number of species\), and maximal effetiveness\; besides the work informs when particular care would be preserved in benthic methods. In many cases, particulary when the abundance of organisms was law and number of samples was small, great mistakes may occur in estimating the number of fauna\; even the use of statistical methods \(error of arithmetic mean\) does not prevent the occurrence of such mistakes. When there are great abundances of organisms and the numbers of samples are not very small, small surface samplers yield results no worse than those obtained with large surface samplers and save us much time and labour."]

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