The role zooplankton play in aquatic ecosystems often depends on their abundance and their size. However, enumeration and sizing of zooplankton are tedious tasks. Here, we describe an inexpensive, semiautomated system which allows projection, counting, and sizing with a caliper, data storage and retrieval, and compilation of species-size distributions. Direct application of our computerized system for processing zooplankton to studies of fish and zooplankton is described.
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Mills et al. (1986) studied this question.