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

摘要: The potential for predation by the sea stars Asterias rubens and Marthasterias glacialis on seed-size (41 ± 3 mm shell height) juvenile scallops (Pecten maximus), ready seeding in ranching areas, was investigated a 30-day laboratory experiment. There no significant difference (P > 0.05) rate of large A. (95–115 radium) M. (120–164 radius), which averaged 0.88 0.71 individual−1 day−1, respectively. Maximum rates were 2.44 day−1 3.00 glacialis. Small (76–87 radius) had significantly lower than individuals either species (average 0.13 P < 0.05). (50–80 only began to prey when average scallop size reduced 35 mm. Based estimated density at Norwegian site rates, population seeded 10 m−2 would be between 0.5 11% 1 month. Furthermore, using highest observed rate, degree loss indicated that culture via not economically viable thus methods reducing are necessary.