Hormonal regulatory role of eyestalk factors on growth of heart in mud crab, Scylla serrata

Aug 21, 2013Saudi journal of biological sciences

Hormones from the eyestalk control heart growth in mud crabs

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Abstract

Bilateral eyestalk ablation resulted in a maximum heart growth index of 0.162 in male crabs.

Heart growth indices were higher in ablated male crabs compared to control and injected groups.
The heart growth index for females was 0.158 after ablation, which is lower than that of males.
Males exhibited faster heart growth than females across all experimental conditions.
Bilateral eyestalk ablation significantly increased heart growth in males, with minimal impact on females.
Eyestalk factors and molting hormone may play a role in regulating heart growth in Scylla serrata.

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The present study was attempted to know the growth regulation of eyestalk factors on the growth of heart in Scylla serrata using eyestalk extractions and bilateral eyestalk ablations. The bilateral eyestalk ablation led to the maximum growth indices of the heart ((H) indices) to 0.162 and 0.158 in ablated male and female, respectively, in comparison to 0.153 and 0.167 in the control male and female and 0.147 and 0.157 in injected male and female, respectively. The data have shown that the heart of male crabs grows faster than female crabs. The study has also shown that bilateral eyestalk ablation resulted in a significant increase in the heart indices in males and has least effect on the growth of the female heart. The results presented strongly support a potential role of the eyestalk factors and molting hormone regulating the growth of the heart in S. serrata.

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