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The journal publishes original articles on all aspects of fish ecology and fishery sciences in lakes, rivers and estuaries, including ecologically oriented studies of behaviour, genetics and physiology and the conservation, development and management of recreational and commercial fisheries. Reports of studies examining ecological questions in an evolutionary framework are published as well, including research papers addressing evolutionary ecology, behavioral ecology, population ecology, and population biology. Papers dealing with the life stages of anadromous and catadromous species in estuaries and inshore coastal zones are also published if they contribute to the general understanding of fish ecology. Theoretical papers and studies of impact assessment and modeling are published if they generate testable hypotheses about real systems (fish communities, populations and/or species) or if published data are re-analysed to produce novel conclusions or syntheses. Articles, letters and reviews are published based on their scientific content. Occasionally, the proceedings of conferences and symposia are published if they are relevant and timely. Each article contains an extended abstract in Spanish.