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Comparative Study of Monosex Tilapia (oreochromis Niloticus) Production Under Different Stocking Density in Ponds

M.S.Reza
Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymesnsingh-2202, Bangladesh

P. Sarker
Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymesnsingh-2202, Bangladesh

M. R. Hasan
Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymesnsingh-2202, Bangladesh

U. A. Janifa
Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymesnsingh-2202, Bangladesh

M. A. Rahman
Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymesnsingh-2202, Bangladesh

Abstract/ Executive Summary:

A field experiment was conducted to study the effect of stocking density on the growth and production of monosex male tilapia (Oreochromis niloticus L.) conducted in six ponds commencing from 7th July to 4th November, 2012. Feeding frequency were two times in a day. The mean initial weight of fry in all the treatments were 5.7±0.04 g and after completion of the experiment the mean final weight of tilapia was 321.62±1.11 g for T1, 300.12±0.87 g for T2 and 256.25±2.38 g for T3. The mean weight gain of 315.92±1.11, 294.42±0.87 and 250.552.38g and mean percent weight gain of 5542.40, 5165.20 and 4395.61% and mean FCR was 1.41±0.00, 1.46±0.01 and 1.59±0.00and mean SGR of 3.36, 3.30 and 3.17% and the survival rate was 97.67, 94.25 and 93.40% were recorded in T1, T2 and T3, respectively. The highest weight gain, percent weight gain, SGR and survival rate were found in T1 and lowest were found in T3. The production was observed to be 47.12±0.52, 56.57±0.80 and 59.84±1.10 kg/dec/4 months in T1, T2 and T3, respectively. The significant (P?0.01) highest fish production and FCR was obtained 59.84 kg/dec/4 months and 1.59 respectively in T3 under stocking density was 250 fish/decimal and production, FCR was found to be decreased significantly with the decrease in stocking density. The lowest fish production 47.12 kg/dec/4 months were observed in T1. Although higher production was obtained in T3 but individually growth performance of monosex tilapia was higher in T1.

Keywords: Monosex tilapia, Growth performance, Stocking density, Tilapia production

Location: Mymensingh district.

Start Date: 07-07-2012

End Date: 04-11-2012

Program Area: Animal Health and Management

Commodity: Tilapia

Objectives:

To study the growth performance of monosex male tilapia under different stocking density; and
To determine the suitable stocking density for culture of tilapia in ponds.

Methodology:

Study area and pond facilities: The experiment was conducted in Reliance Aqua Farms which is situated in Rahmatpur, Sadar, Mymensingh owned by HriteshPandit. The experiment was carried out in six similar ponds i.e.; the size, depth, basin configuration and water supply facilities were almost same of all ponds. The size of each pond was 25 decimal and the shape was rectangular. Experimental protocol: The experiment was carried out commencing from 7th July to 4th November, 2012. The study was conducted with the fry of monosex male tilapia (Oreochromis niloticus L.). The weight of each fry 5.7 g was stocked to study the effect of stocking density on the growth of monosex male tilapia. Experimental design: Monosex male tilapia (O. niloticus) fry was stocked as experimental species. Ponds were divided into three treatments Viz. T1, T2, and T3 each having two replications, for stocking fish at 150 fry/decimal, 200 fry/decimal and 250 fry/decimal, respectively. The size of the each pond was 25 decimal. Fry collection and stocking: The fries of tilapia, Oreochromis niloticus were collected from Reliance Hatchery, Trishal, Mymensingh. The fries were kept in a nursery pond at a high stocking density. After three days later fries were transferred to the experimental grow out ponds. The average weight of each fry was 5.7 g. The stocking densities of fries were 150/decimal, 200/decimal and 250/decimal in T1, T2 and T3 respectively. Proper methods and hygienic conditions were maintained during release the fry into the ponds. Feeding: The feeds were applied at the rate of 5% of body weight at the beginning of the experiment. Then it was reduced to 4% after one month and it was further reduced to 3% after 2nd month and thence to end of the experiment. Feeds were applied twice a day, half in the morning (8.00 am) and the rest in the afternoon (4.00 pm). Mainly the MEGA fish feed was used throughout the experimental period. Sampling procedure: Sampling of the experimental fish was done randomly at an interval of 15 days by using seine net and scoop net in order to check the growth performance of fish and also adjust the feeding rate. Growth of fish in each sampling was taken by weight of fish. Water quality parameters: Water quality parameters were monitored every 15 days interval throughout the experimental period to maintain the proper environment of experimental ponds for fish. Important water quality parameters such as dissolved oxygen, water temperature and pH were monitored throughout the experimental period. Estimation of the growth parameters of fishes: Data collected during growth trials and subsequent analysis of data was used to determine the growth trials in different treatments were calculated. Specific growth rate (SGR %/day): Specific growth rate (SGR) is the instantaneous change in weight of fish calculated as the percent of increase body weight per day over the experimental period. SGR was calculated. Food Conversion Ratio (FCR): The food conversion ratio is expressed by the amount of food consumed to the weight gain was determined for each of the three treatments. Production (kg/dec/4 months): At the end of the experiments, most of the fishes were caught by net and the rest by draining out the ponds. It was calculated as: Production = No. of fish harvested × Average final weight of fish (g) Statistical analysis: One way analysis of variance (ANOVA) was used to determine the effect of stocking density on the growth of monosex tilapia in different treatments. For this purpose the present data were converted to arcsine and then applied for analysis. This was followed by Duncans New Multiple Range Test (DMRT), to identify the level of significance of variance among the treatments. Computer analysis of data was done by using the software SPSS program and MS excel program. Economical analysis: A simple economical analysis was performed to estimate the net profit of cultured monosex tilapia. The cost of feed was BDT 44/ kg.

Source of Information: Advances in Life Science and Technology Vol 30, 62-69, 2015

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The significantly (P?0.01) highest fish production was obtained 59.84 kg/dec/4 months in T3 under stocking density 250 fish/decimal and production was found to be decreased significantly with the decrease in stocking densities. The lowest fish production 47.12 kg/dec/4 months and lowest FCR were observed in T1 under stocking density 150 fish/decimal. The net profit observed significantly highest in T2 under stocking density 200 fish/decimal and the profit observed lowest in T3 under stocking density 250 fish/decimal. Based on the present experimental condition, it can be recommended that the stocking density for monosex tilapia 200 fish /decimal is best for better production.

Knowledge Management: Journal