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A Review on All Male Mono-sex Gift Seed Production by Using 17-α Methyl Testosterone Hormone Practiced in Bangladesh

Mehady Islam
Executive, Aqua Services, AgroVet Division, Square Pharmaceuticals Ltd., Mymensingh, Bangladesh

Rumana Yasmin
Scientific Officer
Bangladesh Fisheries Research Institute, Headquarters, Mymensingh, Bangladesh

Abstract/ Executive Summary:

The present study was conducted for the review of present method practiced for all male mono-sex GIFT seed production by using 17-α methyl testosterone hormone in Bangladesh. In Bangladesh, all male mono-sex GIFT seed production by using 17-α methyl testosterone hormone is performed from the mid February to November, starting with egg collection. Smaller hatching trays or, jogs were used for the incubation of the collected eggs for 5 days which are eventually followed by incubation in the larger hatching trays for 36 to 48 hours until the yolk sac totally disappeared. The hormone mixed feed (contained 17-α Methyl testosterone (MT) hormone at the rate of 60-70 mg/Kg) was composed of 50% fishmeal, 30% wheat bran and 20% rice bran. The post larva were subjected to hormone mixed powdered feed for the first time after transferring them to transitory tanks and treated there for 5 days. Into the S.R.T. (Sex Reversal Treatment) ponds, further treatment was completed. There they fed frequently with hormone mixed feed for about 21 days and moved further.

Keywords: Tilapia, Mono-sex seed, Testosterone hormone, GIFT, Bangladesh

Location: Mymensingh of Bangladesh

Start Date: 01-04-2011

End Date: 30-07-2011

Program Area: Resource Development and Management

Commodity: Fish seeds, Hormone

Objectives:

The prime objective of the present study was to investigate the existing mono-sex tilapia seed production approach, which includes sex identification of the brood fish, understanding about the size grading of the collected eggs, the technique to prepare stock solution of hormone to produce all male monosex Oreochromis niloticus Linnaeus, 1758 GIFT seeds and finally the feed administration process, in Bangladesh.

Methodology:

The study was conducted in Mymensingh (24º34.5´N, 90º23.5´E) of Bangladesh as it is a very important place in relation to fish farming and research. For the study purpose 10 GIFT tilapia farms were randomly selected. The data was gathered over 4 months from 1st April to 30th July, 2011. For gathering data, combinations of several survey techniques were applied. From appropriate governmental and nongovernmental organizations such as Department of Fisheries (DOF), Bangladesh Fisheries Research Institute (BFRI), Agro3, Fish Hatchery & Culture Farm, secondary data about all male mono-sex GIFT seed production by using 17-α Methyl testosterone hormone were gathered. The study exertion was performed by following methods; Direct observation: This was performed through the intense observation of every single procedure and segment of the study purposes. Direct intervention: This was performed through the intervention in the feed preparation, administration etc. Survey through questionnaire: This was done with the help of a questionnaire and filling up that by consulting with 100 experts, farm owner, manager and other stuffs. By means of Microsoft Excel software, data from different pertinent sources were coded and recorded into a database system. To assure the accurateness of the data recorded at all steps of the survey, resemblance between preliminary data sheets and the original coding sheets were evaluated; correctness and quality of the data were scrutinized up, edited and coded at the field level.

Source of Information: International Journal of Fisheries and Aquatic Studies 2016; 4(4): 420-424

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The study work starts with the collection of eggs from the mid February and ends at November each year and the fry is frequently fed with hormone mixed feed for about 21 days. The hormone mixed feed contained 17-α Methyl testosterone (MT) hormone at the rate of 60-70 mg/Kg. The production of mono-sex male tilapia using androgen is very much efficient. The suitability of this method is that it does not require any portion of the production to be cast off as in the manual selection, or so as to, two separate stocks of fish are maintained as in hybridization. Even though a plenty of hormones have been using for sex reversal purposes, methyl testosterone is most frequently used androgens. Dosage rate and treatment period may vary according to the environs and skill of the producer.

Nonetheless, very little information is known regarding the environmental impacts of discharging the waste water from tilapia hatchery be utilize MT treatment, the main reason behind is, most of the research till now is concerned only with the impact of estrogens and their anti-androgen on natural fish and other animals, however, its primarily established that the 17-α methyl testosterone hormone is broken down when exposed in the sun light of the natural water sources. However, the amount be intruding to the environment are very lower than from those released from agricultural wastes and domestic sewage. Although steroid hormones like MT are immersed swiftly onto sediments and alike. The gravel and sand filters, or bio-filters as well as wetlands rapidly can remove hormones from water within 24 hours. As aquaculture enduring to an ancillary helping of the world’s fisheries products, tilapia culture will play more significantly. Sex reversal will stay the industry orthodox for controlling reproduction if tilapias.

Knowledge Management: Journal