Mortality of scallop spat in cultivation, infested with tube dwellingbristle worms, Polydora sp. |
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Authors: | S. Mortensen T. Meeren A. Fosshagen I. Hernar L. Harkestad L. Torkildsen Ø. Bergh |
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Affiliation: | (1) Department of Aquacutlure, Institute of Marine Research, PO. Box 1870, Nordnes, 5817 Bergen, Norway;(2) Austevoll Aquaculture Research Station, Institute of Marine Research, 5392 Storebø, Norway;(3) Department of Fisheries and Marine Biology,Bergen High Technology Centre, University of Bergen, 5020 Bergen, Norway;(4) National Veterinary Institute, PO Box 40, 5826 Bergen, Norway |
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Abstract: | Between 1995 and 1997, a traditional Norwegian oyster poll with an attachednursery was used for the production of scallop (Pecten maximus) spat.During summer 1997, four batches of 2 mm scallop spat were placed in thenursery. In June, hydroids (Obelia) caused problems with fouling andaccumulation of sediment in the nursery. Thereafter, the scallop spat wereheavily infested with tube dwelling polychaets (Polydora sp.). Thepolychaets were both introduced with poll water and reproduced inside thenursery. Infested spat suffered high mortalities. Although the spat could have been affected by the hydroids, as well as shortage of food, Polydorainfestations were considered the main cause of the mortalities. Dead andinfested spat were continuously sorted out and discarded, but the infestationproblems persisted. As a result, the scallop spat did not represent anycommercial value for the company, and in September, the nursery wasemptied. In total, approximately one million spat – representing onethird of Norway's intensive scallop spat production in 1997, was lost. |
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Keywords: | Great scallop (Pecten maximus) infestation mortality Obelia sp. Polydora sp. spat |
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