Effect of Different Doses of 17 ? -Methyltestosterone on Masculinization, Pre-Post Treatment Growth Parameters and Condition Factor of Sarotherodon Melanotheron in Pond System

Theophilus Apenuvor, John Blay, Joseph Aggreyfynn and Simon Drafor
Additional contact information
Theophilus Apenuvor: Department of Sciences, Jasikan College of Education, Ghana
John Blay: Department of Fisheries and Aquatic Sciences, University of Cape Coast, Ghana
Joseph Aggreyfynn: Department of Fisheries and Aquatic Sciences, University of Cape Coast, Ghana
Simon Drafor: Department of Sciences, Jasikan College of Education, Ghana

Academic Journal of Life Sciences, 2021, vol. 7, issue 4, 56-62

Abstract: Over-population and stunted growth had been major challenges in the culture of tilapia. The use of synthetic androgen 17- ? Methyl Testosterone (MT) was a breakthrough. However, its optimum level towards effective masculinization and growth is a concern. The aim of this research was to ascertain the optimum level of MT towards effective all-male population production and growth of Black-Chinned tilapia. In the present study, the effect of different dose rates of synthetic androgen 17-? Methyl Testosterone (MT) i.e., 0, 30, 60, and 120 mg of the hormone per kg of feed on sex, growth, and condition of Black-Chinned tilapia was evaluated. MT was administered orally by using powdered dry starter feed (Crude Protein 40 %) and Ethanol. The fry was fed for 30 days in the experimental tanks. At the end of the experiment, the sex ratios were determined by examining the operculum coloration as a means of sex identification. Growth performance was monitored by measuring and recording the morphometric characteristics. Bodyweight and total length of the fish on the start of feeding, end of feeding (one month sex reversal period), and two months after feeding were measured. The results of the present study showed that all MT receiving treatment showed a significantly higher male proportion than the control (0 mg MT/kg feed individuals). In all MT treatments groups, the control expects the 30 mg MT/kg in feed individuals’ deviate significantly from the normal 1:1 sex ratio (Chi-square analysis). The dose rate of 120 mg MT /kg feed resulted in the maximum male population (92.7%). Hence, for an effective high percentage of all-male population production in Black-Chinned tilapia, 120 mg MT /kg in feed is recommended. In terms of growth and condition factor, all the individual treatments, as well as the control, showed no significant difference. All the treated individuals showed similar condition factors during the pre and post-treatment, however, the individuals treated with 30 mg MT /kg feed exhibited better condition during the pre-treatment than the post-treatment period. Temperature, pH and dissolved oxygen recorded in this study were within the desirable limit for tilapia.

Keywords: Sex-reversal; Sarotherodon melanotheron; 17α-methyltestosterone; hormonal treatment; Different doses of hormone; Growth performance. (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.arpgweb.com/pdf-files/ajls7(4)56-62.pdf (application/pdf)
https://www.arpgweb.com/journal/18/archive/12-2021/4/7 (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:arp:ajlsar:2021:p:56-62

DOI: 10.32861/ajls.74.56.62

Access Statistics for this article

Academic Journal of Life Sciences is currently edited by Dr. (Mrs) Utpala Parthasarathy

More articles in Academic Journal of Life Sciences from Academic Research Publishing Group Rahim Yar Khan 64200, Punjab, Pakistan.
Bibliographic data for series maintained by Managing Editor ().