11 pages, 5 figures, 2 tables To test the effects of small-scale turbulence on development and growth of marine copepods, a series of 10 1 labortory microcosms were used to follow the development, under turbulent and calm conditions, of a cohort of Acartia grani, a common coastal planktonic copepod of temperate zones Aside from possible indirect effects due to differences in food availability, turbulence significantly shortened development times and modified growth rates These influences seem to vary throughout its life history, late nauplii and early copepodites being more affected. © 1991 Oxford University Press