[EN] In view of the great social and economic importance of the Ebro delta, and of the fact hat itsyield has been decreasing regularly since 1970, the authors have outlined a project or work which would include study of the ecosystem through analysis of the annual cycles of the sual hydrographic parameters (nutrient salts, pollutants) and through study of the planktonic uccessions and of the populations of fish and lamellibranch molluscs; this should make it possible to ascertain the maximum possible yield of the renewable resources and to programme ational utilization of the zone, including the development of aquaculture […]

[FR] Etant donné la grande importance socio-économique du delta de l'Ebre, et vu que sa production diminue régulièrement despuis 1970, les auteurs ont ébauché un project de trabail qui comportera l'étude de l'écosystème par analyse des cycles annuels des paramètres classiques en hydrographie [...]

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6 pages