Fig. 1. Carcinus maenas. (A) Variations in hemolymph osmolality in selected stages of development in relation to the osmolality of the external medium at 18°C; diagonal dashed line, isoconcentration. (B) Variations in osmoregulatory capacity (OC) at different stages of development in relation to the osmolality of the external medium; different letters near error bars indicate significant differences between stages at each salinity (P<0.05). Values are means ± S.D.; N=4-11 individuals. ZI-ZIV, zoeal stages; Meg, megalopa; CI and CII, earliest crab stages obtained from laboratory cultures; Juv, larger juveniles (14-18 mm carapace width) collected in the field.