[Levels and evolution of different chemical and biological components of the fishpond, related to mineral and organic fertilization]

abonos fosfatados abonos nitrogenados cyprinus fertilisation fertilizer application fish culture fish ponds fitoplancton freshwater fishes nitrogen fertilizers peces de agua dulce perca ph phosphate fertilizers phytoplancton phytoplankton piscicultura pisciculture poisson d'eau douce productividad productivity temperatura temperature tinca zooplancton zooplankton