stock Management and Induced of ( the Abstract The study was conducted on brood stock management and induced breeding of Thai Pangus in a hatchery of Jessore region. Brood fishes were reared in the brood rearing pond by providing artificial diet for good health and full maturation. The water quality parameters; temperature, p H , dissolved oxygen and transparency were recorded from 25-30 0 c, 7-8.5, 4.5-7.1 ppm and 23- 31 cm in the brood rearing ponds respectively. The experiment was conducted on the induced breeding of Pangasius hypophthalmus in a hatchery by using pituitary gland (PG) hormone. The present study consisted of three treatments (T I , T 2 and T 3 ) with three replications of each. The eggs and sperms were obtained just by stripping and then fertilization was done by artificial insemination. Nine pairs of male and five pairs of female were selected for induced breeding and the average body wt. of the female and male were 4.47±0.55 kg and 3.65±0.44 kg respectively. To observe the effective dose for induced breeding, the females were injected at the rate of 8 (T I ), 10 (T 2 ) and 12 (T 3 ) mg PG/kg body wt. and correspondingly the males were administered a dose of 1 mg PG/kg body wt. in all treatments. The male and female ratio was maintained as 2:1 for each treatment. The fertilization rate, hatching rate, deformity rate and survival rate were determined. The fertilized eggs were hatched within 22-24 hours respectively. The water temperature was recorded between 27 to 28.5 0 C during the experiment period. Among the three treatments T 3 showed the best result in terms of fertilization rate (87%), hatching rate (82%), deformity of larvae (6%) and survival rate (80%). The present findings can be used in induced breeding of P. hypophthalmus for the development of hatchery propagation. The overall breeding performances of P. hypophthalmus were found to be satisfactory for the commercial production of this fish in Bangladesh. fertilization (87%), hatching (82%), deformity (6%) and survival (80 %) rates were found among the three treatments. The highest percentage of fertilization, hatching and survival rate obtained in the present experiment may be considered as satisfactory and the highest deformity was found in treatment T 1 . However; there is scope for further improvement in the process. The present findings can be used in induced breeding of P. hypophthalmus in hatcheries.
[1]
Arshad Hossain,et al.
Effect of mixed feeding schedules with varying dietary protein levels on the growth of sutchi catfish, Pangasius hypophthalmus (Sauvage) with silver carp, Hypophthalmichthys molitrix (Valenciennes) in ponds
,
2005
.
[2]
Mostafa A. R. Hossain,et al.
The Impacts of Compensatory Growth on Food Intake, Growth Rate and Efficiency of Feed Utilization in Thai Pangas (Pangasius hypophthalmus)
,
2005
.
[3]
M. A. Haniffa,et al.
Induced spawning of spotted murrel (Channa punctatus) and catfish (Heteropneustes fossilis) using human chorionic gonadotropin and synthetic hormone (ovaprim).
,
2002
.
[4]
G. Wedemeyer.
Fish hatchery management.
,
2001
.
[5]
H. Ohta,et al.
Changes in fertilization and hatching rates with time after ovulation induced by 17, 20β-dihydroxy-4-pregnen-3-one in the Japanese eel, Anguilla japonica
,
1996
.
[6]
L. Garg,et al.
Induced spawning of catfish, Heteropneustes fossilis (Bloch), using D-Lys6 salmon gonadotropin-releasing hormone analog
,
1993
.
[7]
T. R. Roberts,et al.
Systematic revision of the asian catfish family pangasiidae with biological observations and descriptions of three new species
,
1991
.