A natural daphnia population is genetically heterogeneously on with regard to phenotypic response to modification in the food quantity (a set of life-history quantitative traits). The statistically significance effect of a genetic component on phenotypic plasticity on body length, tail spine length, fecundity and viability was obtained. It was found that fecundity have negative relation with body size and viability. Three classes clones which have differences by level of phenotypic response on creating in experiment the grades of environmental conditions on body length, tail spine length, fecundity and viability was extracted. Under decreasing amount of food the specimen of the first reaction kind of clones were diminish body sizes and viability but were increased fecundity. The specimen of the second reaction kind of clones in these conditions, otherwise were increased body sizes and viability but were decreased fecundity. Also the third, stable kind of clones was separated their specimen were not observe of significance reaction to experimental conditions.The ways forming the adaptive strategy was discusses.