Data for: Body size of Daphnia cucullata as an indicator of the ecological status of temperate lakes

The data contains measurements of body size of Daphnia cucullata (body length, body width, length of head, length of tail spine) in 104 lakes with different trophic status (Poland). In total, we measured 3190 individuals of D. cucullata, which gives us 12760 measurements. The specimens were collected over six years, but always during the peak of summer stagnation (July-August). The second sheet presents the morphometric and trophic characteristics of the studied lakes.