Abstract
The filtration rate of Acartia clausii Giesbrecht was measured by Coulter counter, fluorometric determinations of chloropyhll a concentrations, and by a carbon‐14 radiotracer method. Two‐way analysis of variance with replication gave no significant differences between these techniques (P > 0.05). The Coulter counter is the technique of choice because it provides additional information on size‐selective grazing and permits direct conversions from cell volume to carbon content.

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