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Growth and Production Performance of Vietnamese Koi (anabas Testudineus) with Magur (clarias Batrachus) at Different Stocking Densities in a Farmer’s Ponds

MD. ZAHID HASAN
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

A culture experiment was conducted to see the growth and production performance of Vietnamese koi (Anabas testudineus) with Magur (Clarias batrachus) at different stocking densities in a farmer’s ponds under semi-intensive rearing system for a period of 120 days. The experiment was conducted in three ponds at Rahmatpur of Muktagachha Upazila of Mymensingh district from 5 August to 5 December, 2013. The size of ponds were 24 (T1), 24 (T2) and 16 (T3) decimal with an average depth of 4 feet. Three different stocking densities were tested, namely treatments T1 (400 fish /decimal, 350 Vietnamese koi and 50 magur); T2 (450 fish /decimal, 400 Vietnamese koi and 50 Magur) and T3 (550 fish /decimal, 500 Vietnamese koi and 50 Magur). Ruposhi Bangla feed was used in all treatments two times daily from the beginning of the fry stocking. The initial weight of Vietnamese koi and Magur were 5±0.00 g and 2±0.00 g respectively. The initial length of Vietnamese koi and Magur were 2.54 and 3.50 cm respectively. The average highest final weight gain of Vietnamese koi was (138.71±0.03 g) observed in T1 and followed by T2 (135.65±0.12 g) and T3 (129.29±0.49 g). Similarly, the average highest final weight gain of Magur (76.00±0.58 g) was observed in T1 and followed by T2 (68.36±0.43 g) and T3 (62.61±0.58 g) respectively. The average highest final length gain of Vietnamese koi (17.38±0.05 cm) was observed in T1 and followed by T2 (17.00±0.04 cm) and T3 (16.33±0.03 cm). Similarly, the average highest final length gain of Magur (21.30±0.09 cm) was observed in T1 and followed by T2 (17.00±0.05 cm) and T3 (15.87±0.02 cm) respectively. The survival rate of the stocking Vietnamese koi and Magur were recorded 95.14 and 72.00 % in T1; 93.25 and 64.00% in T2 ; 90.80 and 68.00 % in T3 respectively. Fish production in T1, T2 and T3 were 48.93; 52.79 and 60.83 kg/decimal/120 days, respectively. The total production of T3 was increased with the increasing of stocking density compare to T2 and T1. The benefit-cost ratio (BCR) was higher in T3 where BCR was 1.67 and on the other two treatments BCR was 1.53 in T2 and 1.52 in T1 although the highest production was obtained in T3 but individually growth performance of Vietnamese koi and Magur were higher in T1. Based on the result of the present experiment, farmers could be suggested to rear Vietnamese koi with Magur at the stocking density of 550 fish/decimal (500 Vietnamese koi and 50 Magur) which was the highest density tried to get more production and financial benefit. Further experiment need to be conducted by taking higher density than the 550 fish/decimal for the optimization of stocking density to get more production and benefit.

Keywords: Growth, Production, Performance, Vietnamese, Koi, Magur stocking density

Location: Rahmatpur, Muktagachha Upazila, Mymensingh district

Start Date: 05-08-2013

End Date: 05-12-2013

Program Area: Farming System

Commodity: Koi/Climbing, Cat fish

Objectives:

To evaluate the growth, survival rate and production performance of Vietnamese koi and Magur at different stocking densities in polyculture system.
To evaluate the combination of Vietnamese koi and Magur in the polyculture system.

Methodology:

Location of the study area: The experiment was conducted to know the “Growth and production performance of Vietnamese koi with Magur at different stocking densities in a farmer’s ponds” of Rahmatpur, Muktagachha Upazila of Mymensingh district. Duration of the study: The study was conducted for a period of four months from 5 August to 5 December, 2013. Description of the Experimental Units: Three earthen ponds were selected at Muktagachha Upazila under Mymensingh district for the experimental purpose. The size of the ponds were 24 (T1), 24 (T2), 16 (T3) decimal. The ponds were equal in depth, basin, configuration and pattern including water supply facilities. The water depth was maintained at a maximum of 4 feet. There were well organized inlet and outlet system to maintain water level. Water quality was maintained properly through routine exchange of water. The ponds were free from aquatic vegetation and flood. They were exposed to sunlight. Water source of the ponds were from the shallow tube-well. Experimental design: The experiment was undertaken with 3 treatments (T1, T2 and T3). T1, T2 and T3 were designated with Vietnamese koi polyculture along with Magur. The combination of Vietnamese koi and Magur were 350 and 50 per decimal in T1; 400 and 50 per decimal in T2 and 500 and 50 per decimal in T3.The average size of fry Vietnamese koi and Magur were stocked 5.00 g and 2.00 g respectively for the research purpose. Pond preparation: Pond preparation is a pre-requisite for successful fish culture. To achieve the goal of Vietnamese koi with Magur culture in ponds, the experimental ponds were prepared precisely. The ponds were dried before stocking fry. Pond water pumped out and then the ponds were exposed to sunlight for about 2 weeks. Ponds dykes and bottom were repaired where necessary. The excessive bottom mud was removed from the pond. Liming was done at the rate of 0.5kg/decimal. After 7 days of liming experimental ponds were filled up with water up to 4 feet with shallow water pump machine that has propelled by electricity. Here after, the research ponds were fenced by nylon net with bamboo sticks. Collection of fry: The fry of Vietnamese koi and Magur were collected from“Sharnalata Agro- Fisheries Ltd.” at Radakanai in Fulbaria of Mymensingh district. Selection of feed: Commercial pellet feed named “Ruposhi Bangla” was selected for the present experiment. Stocking of fry: Before stocking the fry in the experimental ponds Vietnamese koi fries were reared about 45 days in a nursery pond when the fry become about average 2.54 cm in length and weight about 5g. Magur fries were reared about 28 days when the fry become about average 3.50 cm in length and weight about 2g .Then both were stocked in the research ponds. The initial data of fry (length and weight) were recorded before releasing into the ponds. Feeding Strategy: At the beginning of the experiment feed was supplied at the rate of 20% of the body weight of reared Vietnam koi and gradually it was readjusted to 15%(46-59 days),12%(60-69 days),10%(70-79 days),7%(80-89 days),5%(90-99 days),4%(100-109 days) and 3%(110-119 days). No additional feed was supplied for Magur in Vietnamese koi with Magur culture system. Fish were fed two times daily at every 8 hours intervals. Monitoring and data collection: Growth monitoring was done at 15 days. Both fish were caught with the help of seine net (ber jal). The length and weight recorded by random sampling of 10 Vietnamese koi and 4 Magur fishes from each pond. Length was recorded by using a centimeter scale and weight by using a balance. Data analysis: Data obtained from the present study were analyzed statistically to observe growth performance of different fish species. Data was entered into the Excel and then simple statistics such as mean and standard Deviation (SD) of growth parameters of the fishes was find-out statistically.

Source of Information: MS Thesis, Roll No. 13 Fish Aqua JJ-02M, Registration No.: 40850 Session: 2013-2014, Department of Aquaculture, Bangladesh Agricultural University, Mymensingh

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Achievement/Findings:

The highest production was found from T3 in which stocking density was high and lowest production was found in T1. Vietnamese koi and Magur culture with high stocking density may be done to get high production and maximum benefit. Here concerned is that the culture should be intensive and adopting appropriate management tactics.

Knowledge Management: Thesis