Microspectrophotometry (MSP) is a refinement of spectrophotometry. A finely-focussed beam of light is directed through the outer segment of photoreceptor cells (the cells upon which vision is based) and absorption profiles of the photopigments contained therein are generated. In this way, we can ask marine organisms what colours of light they can see. This information allows us to match the light environment in a rearing system to the characteristics of the organism?s visual system, and to make appropriate adjustments as they grow.
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