Paper Details

Induced breeding, embryonic and larval development of comet gold fish (Carassius auratus) in Khulna, Bangladesh

Zakaria Mahmud, Faysal Ahmed, Alokesh Kumar Ghosh, Md. Abul Kalam Azad, JoyantaBir, S.M. Bazlur Rahaman

Int. J. Biosci. 2(10-2), 28-38. October, 2012 (PDF)

Abstract:

The present study was aimed to perform induced breeding and to observe embryonic and larval development stages of Comet gold fish (Carassius auratus) in mature males and females by administering hormone of double dose in female and a single dose in male by intramuscular injection of ovaprim at a dosage of 0.5, 0.7, 1.0 and 1.2 ml/kg body weight.  Spawning was observed six hours after the injection at ambient temperature (18-22oC). Fertilization rate of eggs were found 50.34, 51.47, 47.30 and 48.24 % respectively with the response of 0.5, 0.7, 1.0 and 1.2 ml/kg of ovaprim. Hatching rates were found 44.35, 43.79, 39.83 and 36.00 % respectively with the same doses. The fertilized eggs were adhesive, translucent and spherical in shape with diameter ranging between 0.9- 1.0 mm and were whitish in color. The incubation period was 76±3 hours at an average water temperature range of 15- 20 0C and all the eggs were hatched in approximately 90 hours after hatching. Samples were taken every 30 minutes interval till completion of morula and then every 1 hour interval up to hatching. The hatchlings were transparent and measured 1.3- 1.7 mm of total length with a large oval head, a well-defined yolk sac and a short tail. Due to good response to synthetic hormone (ovaprim), considerable fertilization and hatching rate, short embryonic period and fast larval development it is possible to conduct breeding program of this species commercially and is suitable for commercial culture.