Impact of eyestalk ablation on androgenic gland activity in the freshwater crab Travancoriana schirnerae Bott, 1969 (Decapoda: Gecarcinucidae)

Latha Nadkandi Padmanabhan and Sudha Devi Arath Raghavan

Abstract
The current study investigated the impact of eyestalk ablation on androgenic gland activity in the freshwater crab Travancoriana schirnerae Bott, 1969 (Decapoda: Gecarcinucidae). Bilateral eyestalk ablation during active phase (March-June) induced hypertrophy and hyperplasia of the gland as evidenced by increased width of the gland, thickness of the connective tissue layer, increase in cell and nuclear diameter with predominance of type I cells. This hypertrophy and hyperplasia was not followed by secretory activity during active phase which possibly suggests the non-functional nature of hypertrophy and hyperplasia. Unilateral destalkation during active phase neither caused hypertrophy nor hyperplasia of the gland cells probably because these crabs may still receive the inhibitory principle from the remaining intact eyestalk causing the gland to remain analogous to that of the unablated controls. The androgenic gland of control crabs during revival phase (January-February) was discerned with a few patches of proliferated type I cells scattered among vacuoles and degenerating cells. The most prominent feature of the gland of bilaterally ablated crabs during revival phase was the extensive proliferation of type I cells. Not much significant change was observed in the morphology and histology of the gland of unilaterally ablated crabs of revival phase.

Keywords
Androgenic gland, eyestalk ablation, freshwater crab, histology, hyperplasia, hypertrophy.

DOI
10.21472/bjbs.030511

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References
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