Studies on ovarian development of macrobrachium dayanum (Hend.) in relation to gonadosomatic index and hepatosomatic index

Seema Langer*, Anshu Samyal and Yahya Bakhtiyar

Department of Zoology, University of Jammu, Jammu - 180 006 India.

ABSTRACT: While studying the reproductive behavior during the different seasons of a year, the different developmental stages of oocytes in the ovary of M. dayanum (Hend.), a locally available freshwater prawn, have been recognized as: Stage 1: Oogonia, Stage 2: Previtellogenic oocytes, Stage 3: Vitellogenic oocytes, Stage 4: Mature oocytes. Gonadosomatic index (GSI) used estimating reproductive condition of the female prawn, increases concomitantly with maturation. A significant positive correlation exists between GSI and HSI (r=0.580, p<0.05). GSI showed a bimodal peak throughout the reproductive period. M. dayanum has high gonadal activity from March to May concomitant with highest average GSI in the month of April owing to the growth of vitellogenic oocytes and low GSI during immature phase.

KEYWORDS: Macrobrachium dayanum; Gonadosomatic; Hepatosomatic index

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