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Research Detail

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Md Zahid Hasan
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh, Bangladesh

Md. Fakhrul Islam
Department of Fisheries, Bangamata Sheikh Fojilatunnesa Mujib Science and Technology University, Melandah, Jamalpur-2012, Bangladesh.

Syed Ariful Haque
Department of Fisheries, Bangamata Sheikh Fojilatunnesa Mujib Science and Technology University, Melandah, Jamalpur-2012, Bangladesh.

Md. Saiful Islam
Department of Fisheries, Bangamata Sheikh Fojilatunnesa Mujib Science and Technology University, Melandah, Jamalpur-2012, Bangladesh.

Md. Mokhlasur Rahman
Department of Fisheries, Bangamata Sheikh Fojilatunnesa Mujib Science and Technology University, Melandah, Jamalpur-2012, Bangladesh.

Md. Idris Miah
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh, Bangladesh

An experiment on induced breeding of gang magur, Hemibagrus menoda (Hamilton, 1822) using Ovatide hormone was carried out at in the Field Laboratory Complex of Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh. This study consists of three treatments each with three replications. The objective of the experiment was to find out the effective dose of Ovatide hormone for induced breeding. A total number of 54 brood fish were used for the experiment among which 36 were male and 18 were female. Brood fish were kept in the ratio of 2':1' for breeding purposes. Female broodfish were injected at the rate of 7, 5, 3 ml Ovatide/kg body weight while the males were injected with 3, 2.5, and 1.5 ml Ovatide/kg body weight respectively in T1, T2, and T3 at the same time. The brood fish were injected with a single dose of Ovatide in all treatments. Ovulation rates were 0%, 100%, 63%; fertilization rates were 0%, 97%, and 90%, and hatching rates were 0%, 95% and 76% in treatments T1, T2, and T3 respectively. Fertilized eggs were incubated for 21-22 h in all the treatments. Higher ovulation rate (100 %), fertilization rate (97%), hatching rate (95%) and survival rate (85%) were found in treatment T2. Therefore, the optimum dose of Ovatide hormone for induced breeding of H. menoda is 2.5 and 5 ml Ovatide/kg body weight of male and female brood fish, respectively.

 

  Dose optimization, Gang magur, Induced breeding, Ovatide
  Field Laboratory Complex, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh
  00-03-2017
  00-07-2018
  Variety and Species
  Fish

To evaluate effects of different dosages of Ovatide hormone on breeding performance of H. menoda.

Site selection and duration of the study: This experiment was carried out at Field Laboratory Complex, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh from March 2017 to July 2018. The aim of the experiment was to evaluate the effects of different dosages of Ovatide hormone for induced breeding of H. menoda. The brood fish were collected from Jaria-Jhanjail point, Kangshariver, under Netrokona district, Bangladesh. Brood fish collection and rearing: A total of 54 live H. menoda were collected during March 2017 and February 2018 from Kangsha river located at Jaria-Jhanjail, Netrokona district, Bangladesh. During the rearing period, the fish were fed with SIS (small indigenous species of fish), and CPC feed, a special feed enriched with protein and vitamin-E was fed at a rate of 4-5% body weight which enhances the gonadal maturation in fishes. Regular manuring, fertilization, and liming were performed whenever necessary. Brood selection: To carry out the induced breeding trial, male and female broods were caught from the brood-rearing ponds using a cast net. The average weight of the male and female were 371±50 g and 778±80 g, respectively. The gravid male and female were selected based on the following criteria. Males with a relatively smaller body, elongated and slender in shape having swollen and reddish urogenital papillae were selected. Contrariwise, the female was identified by having a rounded and protruding abdomen which is soft when touched with fingers and the swollen genital opening sometimes reddish in color. Conditioning: Selected broods were transferred to the cemented circular tank in the hatchery with continuous water showering for about five hours prior to administering hormones. Male and female were kept off-feed during conditioning. Collection and preparation of Ovatide: Ovatide hormones were used as inducing agents. The proper doses of Ovatide hormone were calculated based on the recommended dose and bodyweight of the brood fish using this formula: Amount of ovatide (mL) = Wt. × Pt./ 1000; Where Wt. = the total body weight of the fishes injected (g); Pt. = the rate in mL ovatide injected·kg -1 body weight under a particular treatment. For Ovatide preparation, the powder from synthetic hormone was diluted with distilled water to dissolve it in the contained vial and shaken for a few minutes. The prepared solution was then taken out in a 5 ml disposable syringe for injection. Hormone injection: The hormone solution was administered intramuscularly to the female and male between the dorsal fin and lateral line maintaining about 45° angular position with the body. The injected fish were then released into breeding hapa placed in tanks for synchronized spawning. Observation of reproductive behavior: After injection, both male and female broods were kept together in the spawning tank (temperature 25.5 °C; pH 7.2; dissolved oxygen 6.5 ppm) and their reproductive behavior was closely monitored. Experimental design: This experiment was conducted using commercial Ovatide hormone consisting of three treatments T1, T2, and T3 with three replications each in a Completely Randomized Design (CRD). A total of 54 broodfish were taken and kept at a ratio of 2 male: 1 female in the tanks. Semi artificial (or induced natural) propagation method was adopted which involved synchronized spawning in breeding hapas whereby the injected brood fish (male and female spawners) were placed into a breeding hapa fixed in circular and rectangular tanks (dimensions: 1.22×2.74×0.37 m). Double hapa (upper and lower) were used with the mesh size of the upper hapa (dimensions: 1.35×1.12×0.36 m) being larger than the lower hapa (1.24×1.02×0.36 m). After ovulation of 21-22 h and fertilization, the upper hapa was then removed along with the spent spawners while the fertilized eggs settled in the lower hapa which served as a shelter during the incubation period. Larvae were also hatched in the hapa. Statistical analyses: For statistical analysis of data, one-way analysis of variance (ANOVA) followed by Duncan’s Multiple Range Test (DMRT) at a significance level of P<0.05 was employed. The statistical data analysis was carried out with the aid of the computer software SPSS version 20 and necessary graphs were drawn by MS Excel 2013.

  Res. Agric., Livest. Fish.8(1): 171-179, April 2021
  DOI: https://doi.org/10.3329/ralf.v8i1.53279
Funding Source:
1.   Budget:  
  

This study investigated the optimum dose of Ovatide hormone for induced breeding of this species. Induced breeding of H. menoda has been successful using single doses each of Ovatide hormone 5, 3 ml/kg body weight of the female. Comparison of the spawning successes of Ovatide hormones revealed that 5 ml/kg body weight of female and 2.5ml/kg body weight of male could be considered the optimal dose for the induced spawning of H. menoda in a 2':1' ratio. This study provides the first data on the induced breeding technique of H. menoda. The success achieved in this study over the control of this fish under captivity makes its domestication possible and a promising candidate as a cultured fish. The present findings on the optimum doses of Ovatide may serve as a basis for the subsequent induced breeding and fry nursing of H. menoda in Bangladesh. The seed production technology of the species is the most prerequisite of the development of culture package technology. The applicability of the induced breeding program for H. menoda should be demonstrated in hatcheries for the benefit of farmers throughout Bangladesh.

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