Sciences marines : recherche et développement

Abstrait

Embryonic Development of Commercially Important Portunid Crab, Charybdis feriata (Linnaeus)

Soundarapandian P, Ilavarasan N, Varadharajan D, Jaideep Kumar and Suresh B

The quality and survival of newly hatched zoea will depend primarily on the embryonic development. So an attempt has been made to study the embryonic development in the portunid crab, Charybdis feriata. The embryonic development of C. feriata is divided into six stages, viz. blastula, gastrula, eye placode, pigment; heart beat and freshly hatched first zoea. In blastula stage, the eggs were round, golden yellow in colour and the diameter of the egg was 0.36 mm-0.37 mm. In gastrula stage, the eggs were round and deep yellow or yellowish orange in colour, and the diameter of the egg was 0.38 mm-0.39 mm. In eye placode stage, the eggs were round orange in colour and the diameter of egg was 40 mm-41 mm. In pigment stage, the eggs were brown in colour and the diameter of the egg was 0.42 mm-0.43 mm. In hear beat stage, the eggs were dark brown or black in colour, and the diameter of the egg was 0.44 mm-0.45 mm. The freshly hatched I zoea moved freely in the water, and its carapace length ranges from 1.05 mm-1.25 mm.