The embryonic development and formation of Bunnei (Barbus sharpeyi Gunther, 1874)

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Abstract

Understanding the embryogenesis of Bunni is a useful tool for finding the time and suitable
environmental conditions for spawning, growth requirements and use of techniques to
increase the growth rate and survival. The stages of embryonic development for Bunnei
(Barbus sharpeyi) was investigated in 22°C. The reared brood stocks were spawned in
captivity condition. The oocytes were spherical, brown and very adhesive. The cleavage was
fast and the first division was recorded within 15-20 minutes after fertilization. The
blastulation and gastrulation were investigated in 7:40 and 13:10 hours after fertilization with
the yolk sac diameter of 1.18±0.061mm (Mean±SD), respectively. The organogenesis was
started 21 hours after the fertilization, when the blastopore was closed and notochord was
formed. The embryonic stages were continued by appearance the brain, the somites and the
melanophores on the yolk sac. The heart was beaten and shown the blood circulation 65 hours
after the fertilization. The head, tail and pectoral fins were moved frequently. The embryo
reached to pre hatching and final hatching 79:10 and 84:10 hours after fertilization,
respectively, and the embryo existed from corion with the length of about 5.29±0/121mm
(Mean±SD).

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Iranian Scientific Fisheries Journal
Volume 22, Issue 4 - Serial Number 85
November and December 2014
Pages 1-12

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