Abstract
Abstract A melatonin radioimmunoassay was validated for the green sea turtle. A pronounced diurnal rhythm of melatonin content was evident in both serum and cerebrospinal fluid (CSF). In immature turtles, CSF melatonin levels paralleled those in serum but were always significantly lower. Despite the close anatomical juxtaposition of the sea turtle's large pineal gland to the brain, our data suggest that the primary route of secretion into the CSF is through the peripheral vasculature via the choroid plexus. Light exposure reduced serum melatonin titers. Adult females that were either mating or nesting exhibited the lowest serum melatonin levels we measured for this species.
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