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The potential for predation by the sea stars Asterias rubens and Marthasteriasglacialis on seed-size (41 ± 3 mm shell height) juvenile scallops (Pecten maximus), readyfor seeding in sea ranching areas, was investigated in a 30-day laboratory predationexperiment. There was no significant difference (P[0.05) in predation rate of largeA. rubens (95–115 mm radium) and large M. glacialis (120–164 mm radius), whichaveraged 0.88 and 0.71 scallops individual-1 day-1, respectively. Maximum rates ofpredation were 2.44 scallops individual-1 day-1 for large A. rubens and 3.00 scallopsindividual-1 day-1 for large M. glacialis. Small M. glacialis (76–87 mm radius) had asignificantly lower predation rate than large individuals of either species (average 0.13scallops individual-1 day-1, P\0.05). Small A. rubens (50–80 mm radius) only began toprey on scallops when average scallop size was reduced to 35 mm. Based on estimateddensity of sea stars at a Norwegian sea ranching site and average predation rates, apopulation of scallops seeded at 10 m-2 would be reduced by between 0.5 and 11% in1 month. Furthermore, using the highest observed predation rate, the degree of loss ofscallops indicated that scallop culture via sea ranching would not be economically viableand thus methods for reducing scallop predation by sea stars are necessary

Potential predation rates by the sea stars Asterias rubens and Marthasterias glacialis, on juvenile scallops, Pecten maximus, ready for sea ranching