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Generalized life cycle of the spiny scallop: Males and females probably spawn from mid-August to late October in Gulf Islands. Mass fertilization occurs in water column. Larvae drift as plankton for 3-4 weeks and are dispersed by currents. Settle from plankton and attach to rock or shell by byssus. May break free several times and swim to new location by inhaling and expelling water in a series of jets. Adults reach 85 mm.