Fishery Investigations

20 mussels average length Barrow Barrow-in-Furness Blackwater Blyth estuary breeding females cent per cent coast of England Cole and Savage Conway copepod Cowpen Pool degree of infection density digestive gland dissected distribution examined feet lower female Mytilicola females bearing egg-sacs Ferryside FISHERY Fishguard Fleetwood Gareloch Grainger H. A. Cole habitat hatching heavily infected Heysham Hockley infected hosts infected mussels infection with depth J. W. Jones juveniles Korringa and Lambert l'Office Sci laboratory left valve Llanelly marine MEAN LENGTH Menai Straits metanauplius Meyer and Mann Milford Haven Mill Bay mussel beds mussels taken mussels were taken Mytilicola intestinalis Steuer Mytilus edulis nauplius Newbiggin Neyland number of females number of parasites observed Ostrea oysters parasites parasites per 20 Pêches Marit Pembroke Dock Penryn percentage infection planktonic salinity scalpel sea water Side of Jetty south coast South Wales spread of Mytilicola survey Table Tenby vessels Walney Channel west coast Whitstable Yealm Zandkreek