Pilot studies for stock enhancement of purple sea urchins (Paracentrotus lividus, Lamarck, 1816): usefulness of refuges and calcein marking for the monitoring of juveniles released into the natural environment

Open Access

Fig. 2

Monitoring results of the sea urchin release experiment at Cavalinho (a) and São Sebastião (b): mean and standard deviation of shelter presence rate (%) and global presence rate (%). On the top the number of shelters in each monitoring day is presented.

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