REGULATION OF THE RELEASE OF CHROMATOPHOROTROPIC NEUROHORMONES FROM THE ISOLATED EYESTALK OF THE FIDDLER CRAB,UCA PUGILATOR

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Abstract
Electrical stimulation of the isolated eyestalk of U. pugilator induces the release of several peptides which affect epidermal chromatophores. Thresholds for release of these peptides were different, that for red pigment concentrating hormone (RPCH) being lowest, for black pigment dispersing hormone (BPDH) highest and for black pigment concentrating hormone (BPCH) intermediate, but no red pigment dispersing hormone (RPDH) was detected at any voltage. Neurotransmitters, known to be present in crustacean central nervous systems, induced chromatophore dose-dependent responses. Norepinephrine induced BPDH release and dopamine induced both RPCH and BPCH release.