[Rate of pollution: evaluation of fish farms 1992]

aguas residuales aquatic communities biocenose biocenosis biocoenosis carga contaminante charge polluante cours d'eau cursos de agua danemark denmark dinamarca fish culture fish ponds freshwater ecology habitat habitats measurement mesure oxygen piscicultura pisciculture pollutant load pollution de l'eau rivers sinecologia synecology wastewater water pollution