Artificial lighting system for fish and a method of providing fish lighting

A method of providing fish lighting in the form of a light intensity distribution, comprising:

• receiving instructions representing a desired fish behavioral and/or physiological response as a set of at least two coordinate values, wherein a first coordinate value represents a visual response, and a second coordinate value represents a biorhythm response, or receiving instructions representing a desired fish behavioral and/or physiological response and deriving from the received instructions a set of at least two coordinate values, wherein a first coordinate value represents a visual response, and a second coordinate value represents a biorhythm response;
• converting the coordinate values into a lighting control signal;
• and
• driving a lighting arrangement using the lighting control signal,
• wherein the lighting control signal is adapted to select the intensity and color of the output from the lighting arrangement to obtain the desired fish behavioral or physiological response.