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Comperative Study on Growth of Supermale Tilapia and Monosex Tilapia in Earthen Mini Pond

HABIBA AKTAR
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

An experiment was carried out to determine the comparative growth study of supermale tilapia and monosex tilapia for a period of 90 days in eight experimental ponds in the northern side of the Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh. Four treatments were considered having two replicates. For supermale tilapia treatments were named ST1 and ST2 and for monosex tilapia were MT1 and MT2. All the fish were of same age group having mean body weight of 1.4 g. Feeding frequency in all treatments were 2 times a day. Fish were fed at a rate of 30% of their body weight for the first thirty days that was gradually reduced to 15% for the next thirty days and 5% till the termination of the experiment. The mean value of water temperature were 29.78ºC in ST1, 30.42ºC in ST2, 30.50ºC in MT1 and 29.99ºC in MT2, dissolved oxygen were 7.21 mg/l, 7.42 mg/l, 7.14 mg/l and 7.34 mg/l in ST1, ST2, MT1 and MT2, mean pH values were 7.42 in ST1, 7.29 in ST2, 7.50 in MT1 and 7.45 in MT2, ammonia were 0.21 mg/l, 0.24 mg/l, 0.28 mg/l and 0.23 mg/l in ST1, ST2, MT1 and MT2 respectively. The result of the present study showed that the best weight gain of 124.85 g was observed in ST1 after 90 days of culture period. Average weight gain (g) were 1.39, 1.16, 1.14 and 1.05, SGR (per day) were 2.17%, 2.09%, 2.08% and 2.04%, FCR were 2.98, 2.65, 2.84 and 2.57, survival rate were 96%, 94.50%, 95% and 91% and fish production were 5053.92 Kg/ha, 8926.10 Kg/ha, 4108.07 Kg/ha and 7821.41 Kg/ha in ST1, ST2, MT1 and MT2 respectively. The present research findings suggested that supermale tilapia has high growth potential in comparison to monosex tilapia under mini pond culture condition.

Keywords: Growth, Supermale tilapia, Monosex tilapia, Earthen mini pond

Location: Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh

Start Date: 03-05-2012

End Date: 31-07-2012

Program Area: Animal Health and Management

Commodity: Tilapia

Objectives:

Culture feasibility of supermale tilapia in mini ponds and
To study growth and production variation of supermale tilapia with monosex tilapia.

Methodology:

Study area: The experiment was conducted in 8 (eight) experimental pond each of 0.65 decimal, of which 6 are located in the northern side and 2 are in the southern side of the Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh. The study period was carried out for 90 days from 3 May to 31 July, 2012. The water depth was maintained at a level of 1.0 to 1.3 m. The ponds were equal in size and similar in shape, depth, basin configuration and pattern type including water supply facilities. Pond preparation: Aquatic weeds, undesirable fishes, insects and other aquatic organisms were removed manually and the grasses on the pond dykes were also pruned manually into very small size. Lime was applied at a rate of 0.5 Kg/decimal. No fertilizer was used during pond preparation. Experimental design: Two treatments were considered for supermale tilapia and two treatments for monosex tilapia. In each treatment two replications were considered. Collection and stocking of fry: Monosex tilapia fry were collected from Sarnalata Agro Fisheries Ltd., Radhakanai, Fulbaria, Mymensingh and super male tilapia fry were collected from the Brahmaputra Hatchery, Shamvuganj, Mymensingh. Fry were transported by plastic drums having oxygen facilities and transferred to ponds. During stocking sufficient care was taken to reduce stress. Selection of feed: Commercial pellet feed named “Quality Fish Feed” were selected for the study. Feeding strategy: At the beginning of the experiment feed was supplied at a rate of 30% (1st month), 15% (2nd month), 05% up to harvesting of their body weight. Half of the feed was supplied at 9:00 AM and remaining was supplied at about 5:00 PM. The feed was supplied by spreading method manually. Water quality parameters: The experimental ponds were monitored everyday to observe the behavior of fishes. All the ponds were kept clean to provide hygienic condition. The water quality parameters were recorded throughout the experimental period between 8:30 AM to 9:30 AM at fortnight interval. Parameters such as temperature (⁰C), dissolved oxygen (mg/l), pH and ammonia (mg/l) were determined at fortnight interval. Sampling of fish: Fish sampling was done at fifteen days interval in the morning at around 7:30 AM to 8:30 AM. During each sampling of fish were caught by cast net and weight was taken by precision weighing balance (accuracy up to 0.1 g). Growth parameters: The following parameters are used to evaluate the growth of fish such as weight gain (g), average daily weight gain (g), percent weight gain, specific growth rate (SGR), food conversion ratio (FCR), survival rate (%) and production (Kg/ha/90 days). Data analysis: The data obtained on the growth of fish, FCR, survival rate and production were statistically analyzed to see whether the influence of different treatments on the growth (weight) and production of fishes were significant or not. Significant differences between treatments were identified by T Test (Student’s T Test). All statistical analysis was carried out by MS Excel 2007.

Source of Information: MS Thesis, Roll No.: 12 Fish Aqua JJ-17M, Registration No.: 39554 Session: 2012-13, Department of Aquaculture, Bangladesh Agricultural University, Mymensingh

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Supermale tilapia has high growth and survival rate in comparison with monosex tilapia. Supermale tilapia has nice bright reddish color which attracts the customer’s attention. Their body shape is slightly round which gave them nice outlook. Supermale tilapia can eliminates the customers concern on residual hormonal health hazard. Many of the mini ponds remain derelict, which could be brought under tilapia cultivation. Supermale tilapia could be a good candidate in their regard for culture. Poverty alleviation could be increased and fate of poor farmers could be improved through culture of supermale tilapia.

Knowledge Management: Thesis