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We have developed a method of estimating the dry weight of planktonic crustaceans by using geometric figures of their approximate shape. Measurements of three dimensions are used in conjunction with the formulae to estimate volume, and then, on the basis of a number of assumptions, individual weights are estimated from these volumes. We verified the accuracy of the estimates by comparing them with measured weights of adult cladocerans and copepods and subsequently adjusting the formulae. These data are used to form weight–length relationships for cladoceran species and for developmental groups of copepod species. These weight–length relationships may be useful for estimating the biomass of zooplankters from other lakes when size and shape and method of preservation are similar to those of our organisms. For specimens of different size and shape and for different species, the geometric formulae may be useful.
Lawrence et al. (Fri,) studied this question.