بررسي مراحل تكامل جنيني و لاروي ماهي شيربت Barbus grypus (Heckel, 1843)

Surveying the Embryonic and Pre-larval development of Barb, Barbus grypus (Heckel, 1843)

Abstract The embryonic and pre-larval development of Barb (Barbus grypus) was investigated in the reproduction center of endemic fishes in khouzestan province. The fertilization and hatching percentage of egg were 85% and 75%, respectively. Microphile pore in oocytes was similar to the peak of volcano or stoma of plant body and average diameters of oocytes was 2.18± 0.16 mm. Eggs with a chorion were spherical, transparent , a little adhesive and without an oil globule and the average diameter of fertilized egg was 2.44 ± 0.06 mm. The first cleavage occurred after 170-200 min and egg incubation and larval development took place after 61 h 30 min.The length of larvae with spoon shaped yolk sac was 7.96 ± 0.25 mm. Open mounth and two chamber swimming bladder were observed in larvae after two and five days of development, respectively. keywords; Embryonic Development, Larval Development, Barbus grypus.