The pyRIVE model aims at representing the biogeochemical functioning of aquatic system, by simulating concentrations of oxygen and nutrients dissolved (NH4+, NO2-, NO3-, PO43-, SiO2) and particulate (PIP, BSi), suspended matter, dissolved and particulate organic carbon (3 classes of biodegradability), dissolved gases (CO2, N2O et CH4). Biological compartments are represented by 3 taxonomic classes of phytoplankton (diatoms, chlorophyceae, and cyanobacteria), 2 types of zooplankton (rotifers with short generation time and microcrustaceans with long generation time), 2 types of heterotrophic bacteria (small autochthonous and large allochthonous) as well as nitrifying bacteria. Faecal bacteria (free and attached) are also considered as state variables. The model also takes into account benthic variables (benthic organic matter, inorganic particulate phosphorus, benthic biogenic silica).