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BiologyFound on shallow exposed rocky shores, aggregating in high-energy zone, just below foaming surface to depths of about 10 m (Ref. 9002); in kelp and weed areas (Ref. 86913). Feed on either loose or attached weeds and algae (Ref. 9002); mainly consisting of Corallina pilulifera,together with smaller quantities of Ulva actuca, Jania and filamentous species suchas Sphacelaria sp. (Ref. 86913).