Studies on the neurosecretion of thoracic ganglion in relation to reproduction of femaleMacrobrachium lanchesteri (de Man)

The changes in the histology of thoracic ganglion in females ofMacro-brachium lanchesteri, prior to spawning and post parturial moult, have been described. Based on the differences in size, cell inclusions and differential staining with CHP, four distinct types of neurosecretory cells have been identified in the ganglion. The activity of these cells has been correlated with the ovarian condition of the prawn and evidence for the elaboration of a gonad-stimulating hormone (GSH), by the ganglion has been derived. The, probable regulation of ovarian maturation during a normal ovarian cycle and that during the ovigerous condition ofM. lanchesteri have been illustrated