Influence of environment upon the life history of gudgeon, Gobio gobio (L.): a recent and successful colonizer of the Iberian Peninsula,Behavioural thermoregulation and homing by spring chinook salmon, Oncorhynchus tshawytscha (Walbaum), in the Yakima River,Diet of spiny dogfish, Squalus acanthias Linnaeus, on the east coast, South Island, New Zealand,Direct measurements of metabolism, activity and feeding behaviour of pike, Esox Zucius L., in the wild, by the use of heart rate telemetry,Stream channel experiments on downstream movement of recently emerged trout, Salmo trutta L. and salmon, S. salar L.—I. Effect of four different water velocity treatments upon dispersal rate,Stream channel experiments on downstream movement of recently emerged trout, Salmo trutta L., and salmon, S. salar L.—11. Effects of constant and changing velocities and of day and night upon dispersal rate,Stream channel experiments on downstream movement of recently emerged trout, Salmo trutta L., and salmon, S. salar L.—111. Effects of developmental stage and day and night upon dispersal,The opercular gland of the cleaner‐wrasse Labroides dimidiatus (Labridae), a light‐, electron and scanning electron microscopic investigation,Growth and morphological development of chub, Leuciscus cephalus (L.), during the first year of life,A study of the peripheral innervation and muscle fibre types of Ictalurus nebulosus (Lesueur) and Ictalurus punctatus (Rafinesque),Cortisol stimulates hypo‐osmoregulatory ability in Atlantic salmon, Salmo salar ,Age determination in Pomatoschistus mi nut us (Pallas) and Pomatoschistus microps (Kreyer) (Pisces: Gobiidae) from the upper Tagus estuary, Portugal,Seasonal population dynamics of Paraquimpevia tenevvima (Linstow) (Nematoda) in the European eel Anguilla anguilla (Linnaeus) in three localities of southwest England,New biochemical genetic markers in the brown trout (Salmo trutta L.),