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Persistence of the nychthemeral rhythm of melatonin secretion in pinealectomized or optic tract‐sectioned trout (Salmo gairdneri) by William A. Gern; David W. Owens; Charles L. Ralph is a Environmental Science article available to read on EtoBox.

What is Persistence of the nychthemeral rhythm of melatonin secretion in pinealectomized or optic tract‐sectioned trout (Salmo gairdneri) about?

## Abstract In a preliminary investigation, what appeared to be melatonin was measured in the plasma of pinealectomized trout using a specific and sensitive radioimmunoassay. Later, following the combined procedures of thin‐layer chromatography and radioimmunoassay, the immunogenic molecule measured in pinealectomized trout plasma was verified as melatonin. After this validation procedure, plasma melatonin titers were assessed using RIA in pinealectomized, sham pinealectomized or intact rainbow trout either at mid‐photophase or mid‐scotophase. Results demonstrated that pinealectomy significantly reduced plasma melatonin measured at mid‐scotophase, compared to the midscotophase values for either the sham‐operated or intact animals. Interestingly, pinealectomized animals continued to show significantly elevated, mid‐scotophase plasma melatonin titers when compared to the mid‐photophase values. The same was true for the sham‐operated and intact groups. In a second experiment, it was found that severing the optic tract (optictract‐section) did not alter the rhythm of melatonin measured in the plasma. This indicates that the trout pineal may monitor the environmental photoperiod directl

Who reads Persistence of the nychthemeral rhythm of melatonin secretion in pinealectomized or optic tract‐sectioned trout (Salmo gairdneri)?

Author

William A. Gern; David W. Owens; Charles L. Ralph

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0022-104X)

Published

1978

Language

EN

Field

Environmental Science (Life Sciences)