Androgenic gland cell structure and spermatogenesis during the molt cycle and correlation to morphotypic differentiation in the giant freshwater prawn, Macrobrachium rosenbergii

Zoological Science
Takuji Okumura, Motoyuki Hara

Abstract

The freshwater prawn Macrobrachium rosenbergii shows three male morphotypes: blue-claw males (final stage having high mating activity), orange-claw males (transitional stage showing rapid somatic growth), and small males (primary stage showing sneak copulation). This morphotypic differentiation is considered to be controlled by androgenic gland hormone, which is probably a peptide hormone. However, its physiological roles are not fully understood. In the present study, we examined the correlation of androgenic gland cell structure to spermatogenic activity and morphotypic differentiation histologically in M. rosenbergii. spermatogenic activity showed close correlation to the molt cycle in orange-claw males and small males. spermatogonia increased in number in the late premolt stage, becoming spermatocytes in the postmolt stage, and spermatocytes differentiated into spermatozoa in the intermolt and early premolt stages. Ultrastructure of the androgenic gland was additionally compared among the molt stages, but, distinct histological changes were not observed in relation to spermatogenesis during the molt cycle. On the other hand, among the three morphotypes, the androgenic gland was largest in the blue-claw males, containing dev...Continue Reading

Citations

Dec 19, 2012·Marine Drugs·Alessandra Gallo, Maria Costantini
Jun 5, 2010·Reproduction : the Official Journal of the Society for the Study of Fertility·Wen-Ming MaWei-Jun Yang
May 11, 2010·Micron : the International Research and Review Journal for Microscopy·Erika Takagi NunesMaria Izabel Camargo-Mathias
Nov 11, 2006·General and Comparative Endocrinology·Rivka ManorAmir Sagi
Jun 18, 2011·General and Comparative Endocrinology·Tomer VenturaAmir Sagi
Aug 31, 2017·The Journal of Experimental Biology·Himanshu PriyadarshiAparna Chaudhari

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Methods Mentioned

BETA
light microscopy
transmission electron

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