A fluid agitator device for facilitating development of algae or micro algae in trays (20) or photobioreactors, the device comprising at least an actuator device (2) having at least a photovoltaic module (3) destined to absorb a light radiation in order to produce electric energy and at least a motor (4) which is operatively connected to the photovoltaic module (3); and further comprising at least an agitator element (5) which is mobile and activatable by means of the motor (4) and is at least partly insertable in a tray (20) containing water or in a photobioreactor for moving algae or microalgae contained in the tray (20) or photobioreactor.
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