Prelude: looking at early development in fishes; V. Kovác, G.H. Copp. Keynote presentation. Alternative ways to become a juvenile or a definitive phenotype (and on some persisting linguistic offenses); E.K. Balon. Part 1: Reflections on early ontogeny and metamorphosis. Features of transition from larva to juvenile in fishes with different types of early ontogeny; D.A. Pavlov. Thyroxine as a mediator of metamorphosis of Atlantic halibut, Hippoglossus hippoglossus; J.S. Solbakken, et al. Early development of the sofie, Chondrostoma toxostoma; R.E. Gozlan, et al. The reproductive biology and early ontogeny of the mouthbrooding banggai cardinalfish, Pterapogon kauderni (Perciformes, Apogonidae); A. Vagelli. The onset of the juvenile periode in carp, Cyprinus carpio: a literature survey; L. Vilizzi, K.F. Walker. Part 2: Organism-environment relationships. Morphometry of the stone loach, Barbatula barbatula: do mensural characters reflect the species' life-history thresholds? V. Kovác, et al. Correspondence between ontogenetic shifts in morphology and habitat use in minnow Phoxinus phoxinus; P.D. Simonovic, et al. Fish, flows and flood pains: links between freshwater fishes and their environment in the Murray-Darling River System, Australia; P. Humphries, et al. Comparison of growth plasticity in the laboratory and field, and implications for the onset of juvenile development in sofie, Chondrostoma toxostoma; R.E. Gozlan, et al. Part 3: Ontogeny of predator-prey interactions. A review of predation impact by 0+ fish on zooplankton in fresh and brackish waters of the temperate northern hemisphere; T. Mehner, R. Thiel. Seasonal and diel utilisation ofinshore microhabitats by larvae and juveniles of Leuciscus cephalus and Leuciscus leuciscus; E. Baras, J. Nindaba. Seasonal shifts in day-time resource use of 0+ barbel, Barbus barbus; A. Bischoff, J. Freyhof. Vertical distribution and feeding activity of metamorphosing sole, Solea solea, before immigration to the Bay of Vilaine nursery (northern Bay of Biscay, France); F. Lagardère, et al. Part 4: Behaviour and ontogeny. Ontogeny of aggressive behaviour in schools of yellowtail, Seriola quinqueradiata; Y. Sakakura, K. Tsukamoto. School formation and concurrent developmental changes in carangid fish with reference to dietary conditions; R. Masuda, K. Tsukamoto. Ontogeny of diel pattern of stream-margin habitat use by emerging brown trout, Salmo trutta, in experimental channels: influence of food and predator presence; J.-M. Roussel, A. Bardonnet. Size-based variation in somatic energy reserves and parental expenditure by male smallmouth bass, Micropterus dolomieu; R.W. Mackereth, et al. To be a juvenile and not to be a larva: an attempt of a synthesis; K. Hensel. Species and subject index.