Fig. 4From: Sex-ratio, seasonality and long-term variation in maturation and spawning of the brown shrimp Crangon crangon (L.) in the German Bight (North Sea)Smoothed seasonal pattern of fraction of ovigerous female shrimp by length class from (a) North Frisia samples 1958–1992, (b) East Frisia 1958–1992, (c) East Frisia 1966–1976 and (d) East Frisia 1982–1991Back to article page