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    Abstract
2009 (Vol. 1, Issue: 2)
Article Information:

Embryonic Development of Commercially Important Portunid Crab Portuns sanguinolentus (Herbst)

N. John Samuel and P. Soundarapandian
Corresponding Author:  P. Soundarapandian 

Key words:  Portunus sanguinolentus, cleavage, gastrulation, yolk granuales, heart beat stage, ,
Vol. 1 , (2): Page No: 32-38
Submitted Accepted Published
2009 July, 15 2009 Sep., 02
Abstract:

In the present study an attempt was made to study the embryonic development of commercially important crab Portunus sanguinolentus. The new ly spawned eggs were round and golden yellow in colour. The undeveloped and mass of undifferentiated cells were also found in the berry. The yolk granules were denser. The cleavage and gastrulation were not clear. The diameter of the freshly laid egg was 0.34mm.The multicell eggs were round, deep yellow or yellow ish orange in colour. The space between the egg w all and the inner developing embryo was visible. The diameter of the egg was 0.41mm.The eye stage eggs were round and orange in colour. The yolk granules were not denser. Segmentation and organogenesis were clearly seen. The eye spots appeared as scarlet crescent. The egg diameter was 0.48mm.The pigment stage eggs were brow n in colour with slightly elliptical shape. Appendages of the embryonic larvae were pigmented. The egg diameter was 0.57 mm. The Heart beat stage eggs w ere dark brown or black in colour. The eyes were round in shape. The heart started to beat vigorously. The diameter of the egg was 0.64 mm.In prehatching stage the rate of heartbeat was increased and the chromatophores were also found increased throughout the body. The diameter of the egg was 0.73mm.
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  Cite this Reference:
N. John Samuel and P. Soundarapandian, 2009. Embryonic Development of Commercially Important Portunid Crab Portuns sanguinolentus (Herbst).  International Journal of Animal and Veterinary Advances, 1(2): Page No: 32-38.
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ISSN (Online):  2041-2908
ISSN (Print):   2041-2894
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