Journal of Endocrinology and Reproduction

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Concurrent Effects of Light and Eyestalk Extract on Brain, Thoracic Ganglion and on the Changes in the Gonadal Indices of Female Crab, Paratelphusa hydrodromous (Herbst)


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1 Department of Zoology, P.G.Extension Centre, University of Madras, Fort Campus, Vellore - 632 004, India
     

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Three types of neurosecretory cells, (A, B & C) were identified in the brain and four types of neurosecretory cells (A, B, C & D) in the thoracic ganglion of P. hydrodromous. Continuous exposure to light for 15 days triggered the secretory activity of the neurosecretory cells and increased the gonadal indices. While saline treatment potentiated the light mediated effect, injection of the eyestalk extract inhibited the effect of light. Results of this preliminary study suggest that eyestalk hormones regulate the effect of light on ovarian development in P. hydrodromous.

Keywords

Eyestalk Extract, Gonadal Index, Light, Neurosecretory Cells, Neurosecretory Material, Paratelphusa hydrodromous.
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  • Concurrent Effects of Light and Eyestalk Extract on Brain, Thoracic Ganglion and on the Changes in the Gonadal Indices of Female Crab, Paratelphusa hydrodromous (Herbst)

Abstract Views: 285  |  PDF Views: 0

Authors

M. G. Ragunathan
Department of Zoology, P.G.Extension Centre, University of Madras, Fort Campus, Vellore - 632 004, India
G. Singaravelu
Department of Zoology, P.G.Extension Centre, University of Madras, Fort Campus, Vellore - 632 004, India
S. Mahalingam
Department of Zoology, P.G.Extension Centre, University of Madras, Fort Campus, Vellore - 632 004, India

Abstract


Three types of neurosecretory cells, (A, B & C) were identified in the brain and four types of neurosecretory cells (A, B, C & D) in the thoracic ganglion of P. hydrodromous. Continuous exposure to light for 15 days triggered the secretory activity of the neurosecretory cells and increased the gonadal indices. While saline treatment potentiated the light mediated effect, injection of the eyestalk extract inhibited the effect of light. Results of this preliminary study suggest that eyestalk hormones regulate the effect of light on ovarian development in P. hydrodromous.

Keywords


Eyestalk Extract, Gonadal Index, Light, Neurosecretory Cells, Neurosecretory Material, Paratelphusa hydrodromous.



DOI: https://doi.org/10.18519/jer%2F1998%2Fv2%2F98601