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Growth and Production Performance of Tilapia (oreochromis Niloticus) Polyculture with Carps in Homestead Pond

MUKTA RANI SARKER
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

The present study was conducted to evaluate the growth and production of fishes at different species compositions in polyculture using tilapia (Oreochromis niloticus), silver carp (Hypophthalmichthys molitrix), catla (Catla catla), rohu (Labeo rohita), mrigal (Cirrhinus cirrhosus), and mirror carp (Cyprinus carpio var. specularis). The experiment was for a period of 121 days from March 16 to June 16, 2012 at Gouripur upazila under Mymensingh. There were three treatments viz. stocking densities: tilapia 250, silver carp 5, catla 3, rohu 3, mrigal 3 and mirror carp 3 fish per dec in T1; tilapia 330, silver carps 3, catla 3, rohu 2, mrigal 5 and mirror carps 2 fish per dec in T2 and tilapia 130, silver carps 2 , catla 2, rohu 3, mrigal 2 and mirror carps 3 fish per dec in T3.The average initial weight of fish in different treatments were of tilapia, silver carp, catla, rohu, mrigal and mirror carp were 41.8, 100.13, 108.17, 98.43, 100.07, and 58.37 g, respectively. The mean final weight of tilapia, silver carp, catla, rohu, mrigal and mirror carp were 157.6, 299.00, 193.5, 211.33, 204.00, 209.27g, respectively. The contribution of the tilapia was the highest to the total production of fishes. There was higher mortality with the increased in density. The highest weight gain found in T3 . Among the three treatments the highest production of fish was recorded in T3 (1151kg/20dec/121days) which was subsequently higher followed by the production of T1 (589.5kg/20dec) and T2 (588.7kg/20dec). In this study the highest production was achieved at the lowest density indicate that stocking density not more than142/dec can be employed for the carp-tilapia polyculture. Further experiment with the stocking density of 142 fish/dec should be employed for the proper selection of density of the polyculture system

Keywords: GROWTH, PRODUCTION PERFORMANCE, Oreochromis niloticus, POLYCULTURE

Location: Gouripur upazila, Mymensingh.

Start Date: 16-03-2012

End Date: 16-06-2012

Program Area: Animal Health and Management

Commodity: Tilapia

Objectives:

To compare the performance of tilapia, silver carp, catla, rohu , mrigal and mirror carp at different stocking densities on the growth and production and
To study the effect of carp- tilapia aquaculture on fish production.

Methodology:

Experimental system: The present study was conducted in farmer's ponds under semi intensive rearing system during the period of 16 March 2012 to 16 June 2012. Three ponds were selected for the study at Gouripur upazila under Mymensingh district. The average size of the experimental ponds was 20 decmal having a depth of 1.66±0.5m. The experiment was conducted in three ponds under three treatments. Experimental fish: The experiment was conducted by using tilapia (Orecohromis niloticus), silver carp (Hypophthalmichthys molitrix), catla (Catla catla), rohu (Labeo rohita), mrigal (Cirrhinus cirrhosus), and mirror carp (Cyprinus carpio var.specularis).The experimental fry were collected at Gouripur bazar from fish fry traders. The average fry size of tilapia, silver carp, catla, rohu, mrigal and mirror carp were 41.80g, 100.13g, 108.17g, 98.43g, 100.7g, 58.37g respectively. Pond preparation: The following measures were undertaken to prepare the ponds before starting the experiment. 1. Pond banks and embankments were raised and repaired properly. 2. All aquatic vegetations of the ponds were cleared off by repeated cutting. 3. Predatory and other undesirable species were removed by repeated netting using cast and seine net. 4. For complete removal of unwanted fishes including other species using rotenone in the ponds. 5. The ponds were limed at the rate of 1 kg/dec Stocking of fish: One week after pond preparation the ponds were stocked with the fingerlings of tilapia, silver carps, catla, rohu, mrigal and mirror carps. The combination of tilapia 250, silver carp 5, catla 3, rohu 3, mrigal 3,and mirror carp 3 fish per decmal inT1, tilapia 330, silver carps 3, catla 3, rohu 2, mrigal 5 and mirror carps 2 per decmal in T2 and tilapia 130, silver carps 2 , catla 2, rohu 3, mrigal 2 and mirror carps 3 per decimal in T3 under different treatments. Feeding: The artificial feed was collected from the local market at Gouripur sador. The feed contains 28% protein, 8-10% fat etc. The feed was supplied at the rate of 5% (1st month), 4% (2nd month) and 3% (up to harvesting) of their body weight. The feed was supplied directly without any feeding tray. Half of the ration was supplied at 9.00a.m and remaining half was supplied at 5.00p.m. Sampling of the fish: Sampling was done by catching the fish using cast net from each pond at 30 days interval. The weight of the fish was recorded using weight balance. Harvesting: At the end of the experiment all the fishes were harvested by netting repeatedly with a seine net from each pond and then counted species-wise. Then the final
weight gained by each species was recorded by measuring weight (g) of individual fish. Growth performance: To evaluate the fish growth the following parameters were used weight gain (g), specific growth rate (%) and production. The tabulated data about growth are shown in table 4 of results. During the growth trial the followings were observed. Survival rate: The survival rate of fishes of each species for each treatment was calculated from the number of fish of each species harvested from each treatment at the end of experiment and those data at the start of experiment. Fish production: The production for each pond was determined by multiplying the average weight (g) of the each of the fish species of fish by the total number of fishes of the same species survived at the end of the experiment. This was done separately for each treatment. Data analysis: Simple statistical analysis was done to observe the growth and production
performance of fishes in different species combination.

Source of Information: MS Thesis, Roll No. 12 Fish Aqua JJ 02M, Registration No. 34775Session: 2007-08, Department of Aquaculture, Bangladesh Agricultural University, Mymensingh

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Achievement/Findings:

The average growth rate of the fishes were found to increase more or less rapidly at the beginning of the experiments and than more or less slowly towards end of the experiment was found. Among all the species H. molitrix showed the highest growth rate in the all treatments. The contribution of tilapia to the total production of fishes was highest.

Knowledge Management: Thesis