DESCRIZIONE
An agricultural unit includes a tank system that is adapted to provide a combined aquatic environment for raising aquatic animals in aquaculture and for cultivating plants in hydroponic culture and an electrochemical device. The tank system releases excretions of the aquatic animals directly into the aquatic environment so as to produce nutrients for the plants while the electrochemical device is operable in an electrolysis mode to produce hydrogen and oxygen while consuming electrical energy provided by a source of electrical energy and is further operable in a fuel cell mode to produce electrical energy and heat by oxidizing the produced hydrogen. The electrochemical device is operatively coupled to the tank system so as to transfer at least part of the produced heat and the produced oxygen to the aquatic environment.