15.1.2 Larval development of Macrobrachium rosenbergii
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15.1.2 Larval development process in Macrobrachium rosenbergii
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Embryonic development:
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Day
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Development
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1st day
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First division takes place at about four hours after fertilization and subsequent division takes place at 90 minutes intervals. Cleavage is completed in about 24 hours.
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2nd day
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Germinal disc appears on the Ventral side of embryo. Gastrulation takes place followed by the formation of blastomere. A, V-Shaped germinal fends is differentiated from the blastoderm on the ventral surface & assuming the position of the developing embryo.
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3rd day
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The rudiments of embryonic regions are formed and the embryo develops into the embryonic nauplius stage
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4th day
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Development of appendages of the nauplius takes place.
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5th day
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past nauplius segment begin to the formed followed by the appearance of rudiments of other cephalic appendages
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6th day
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The caudal papilla appears with rudiments of thoracic legs and telson
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7th day
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The optic rudiments develop & rudiments of appendages and caudal papilla elongate to becomes the telson
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8th & 9th day
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Eye pigment develops, the carapace rudiments to formed
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10th & 11th day
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The heart begins to beat and get is formed.
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12th & 16th day
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The embryo lives parallel to the long axis of the egg & the larva steadily grows.
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17th day
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Appendages elongate & organs are full
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19th & 20th day
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The larva hatches out.
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Last modified: Saturday, 24 December 2011, 11:02 AM
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