PRODUCTION OF CHONDRUS CRISPUS STACKHOUSE JUVENILE FRONDS-. Five cohorts showing two different demographic strategies were identified during the first year of life of Chondrus crispus. Mean frond growth was similar among cohorts (0.5 cm month^-1 in winter and 1.0 – 2.0 cm month^-1 in spring). Individual production was very low, around 1.0 g dry weight.year^-1.