The authors wish to dedicate this document to Donald Hancock, who pioneered the application of scientific management methods to shellfish populations.
The authors also wish to express their gratitude to the members of the working group of Fisheries Biology at CINVESTAV, Mexico, especially to José Luis Cabrera and Roberto Pérez-Castañeda for their help in the edition of figures, and to Roberto Pérez-Castañeda and Mario Rueda for helpful discussions.
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