The maximum carapace width for A. pisonii is approximately 2.7 cm (Díaz & Conde 1989). However, average size varies among the sexes, measuring 2.0 cm and 1.8 cm for males and females, respectively (Díaz & Conde 1989). The size at the onset of maturity (SOM), when individuals are sexually reproductive, occurs at approximately 0.9 to 1.6 cm, depending on salinity (Conde & Díaz 1992). For more information, see "Salinity" below. Size also appears to vary with habitat type, with larger crabs often found in more mature mangrove forests and smaller individuals among stunted mangroves (Conde & Díaz 2000). Although lifespan and growth is highly variable, depending on food availability and environmental conditions, Warner (1967) reported that male crabs reach full size after one to five years.
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