0 IYYX, by the Ameucan Society of Lm~nology and Oceanography. Inc. RNA content of copepods as a tool for determining adult growth rates in the field

We propose a method to determine growth rates of adult copepods based on their nucleic acid contents. We investigated the suitability of this method on the marine copepod Acartia gruni in a range of food concentrations and temperatures. There was a good linear relationship between growth rate (estimated as egg production) and RNA contents of the adult copepods. The slope of the relationship was dependent on temperature. We also built a multipleregression model to predict egg production rates of A. grani as a function of RNA contents and temperature. This method allows very intensive field sampling and does not require incubations onboard. Samples are preserved frozen and analyzed in the laboratory using a very sensitive fluorometric technique that allows working with small numbers of individuals of the desired species. The estimation of growth rates of copepods in the field is still not a completely solved problem. Very often zooplank-tologists search for methods that allow reliable estimates of zooplankton growth rates at temporal and spatial scales short enough to cope with micro- and mesoscale hydrographic variability. For this purpose, approaches based on followin