Abstract
1. 1. Body melanophore numbers and spectrophotofluorometric determinations of melatonin and 5-hydroxytryptamine were made on whole Xenopus laevis larvae reared in aquaria with light and dark surfaces. 2. 2. Light background reared larvae had lower melatonin concentrations and fewer melanophores. 3. 3. Dark background reared larvae had higher melatonin concentrations and more melanophores. 4. 4. 5-Hydroxytryptamine concentrations were not significantly different in the two groups.
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