ISSN 0022-1112. Crease across lower corner of front cover. Contents are: Flounder parasites as biological tags, by D I Gibson; On the generic relationship of the sciaenid fish Bola chaptis Hamilton, with a description of specimens from Burma, by E Trewavas & P K Talwar; Further note on the salmonid populations of the Lough Erne tributaries in Northern Ireland, by D Cragg-Hine; Studies on ulcerative dermal necrosis of salmonids IV - Failure to detect epithelial auto-antibodies in sera from diseased fish, by R J Roberts, W M Shearer & A L S Munro; Observations on the occurrence of Diclidophora merlangi (Trematoda - Monogenea) on the gills of whiting, Gadus merlangus, by C Arme & D W Halton; The occurrence of vibrio disease in wild Norwegian fish, by T Haastein & G Holt; An evaluation of the acadja method of fishing as practised in the coastal lagoons of Dahomey (West Africa), by R L Welcomme; A small sonic tag for measurement of locomotor behaviour in fish, by A H Young, P Tytler, F G T