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A Preliminary Investigation Into the Production of Thai Koi (anabas Testudineus) Reared in Nylon Hapas in Bangladesh

Mahmudul Hasan
PhD Fellow, Institute for Amphibian Biology, Graduate School of Science,Hiroshima University, Japan

Md. Mukhlesur Rahman Khan
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

A. K. Shakur Ahammad
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

Feeding experiment was conducted for 90 days to elucidate the effect of three supplemental feeds on the growth, survival and production of 15 days old Thai koi (Anabas testudineus) fry in nylon hapa. Here, Suny, Mixed (prepared) and Saudi-Bangla fish feed were considered T₁, T₂ and T₃ respectively. Seventy fries (average length 3.63 ± 0.015 cm and weight 0.90 ± 0.18 g) were cultured under three treatments each having three replications. The net weight gain of fish in T₃ (37.20 ± 0.17g) and T₂ (36.80 ± 0.25 g) were significantly higher (p<0.05) than that of T₁ (32.60 ± 0.28g). Average food conversion ratios (FCR) were 3.99 ± 0.15, 3.11± 0.06 and 3.31 ± 0.02 in T₁, T₂ and T₃ respectively. The survival rates of fish were 73, 76 and 83% in T₁, T₂ and T₃ respectively. It was observed that growth of fry varied significantly (p<0.05) with different feeds. The best growth was found from the prepared and Saudi-Bangla fish feed while the poorest growth was found from the Suny feed. There was no significant difference in survival rates. Economic analysis reported that Mixed feed provided maximum profit compared with other feeds. The present study revealed that prepared feed might be used for mass production of Thai koi in hapa in Bangladesh.

Keywords: Anabas, Hapa, Supplemental feed

Location: Fisheries Faculty Field Complex, Faculty of Fisheries, Bangladesh Agriculture University, Mymensingh

Start Date: 21-04-2006

End Date: 19-07-2006

Program Area: Animal Health and Management

Commodity: Koi/Climbing

Objectives:

1. The present study was undertaken to establish Thai koi production in hapa-cum-pond systems and to determine appropriate technology of climbing perch (A. testudineus) in Bangladesh.

Methodology:

Location and duration of the study - To find out the performance of Thai koi (A. testudineus) in hapa, the experiment was carried out in Fisheries Faculty Field Complex, Faculty of Fisheries, Bangladesh Agriculture University, Mymensingh-2202. Fifteen days old fry were released into the hapa for 90 days culture. Description of the research hapa - All the hapas were situated in the same big pond. The hapa were rain-fed and of rectangle shape with an area of 2.23 m² each. The hapa were newly constructed before the start of the experiment. There was inlet or outlet facilities in the ponds in which hapa were set up. Design of experiment - The experiment was carried out for a period of 90 days from 21st April to 19th July, 2006 with three treatments each having three replications. Hapas were randomly selected for three sets of trials. For convenience, the hapas were arbitrarily numbered was 1 to 9. The hapas were divided into three treatments each having three replications. The treatments were; T₁ where Suny feed was given, T₂ where Mixed (prepared) feed was given and T₃where Saudi Bangla feed was given. Hapa preparation - Nine hapas each measuring 1.52m × 1.21m × 1.21m were constructed for this experiment. The hapas were rectangular of synthetic netting of mesh size 5.0 mm closed from all sides except the top. The synthetic net were fitted with bamboo by using rope and metallic wire. The trough shaped enclosures of synthetic netting materials were fixed on the inner side of the frame. The hapas were kept afloat in such a way that 0.61m of structure remains below in water and the remaining 0.61 m were kept above water, so that fishes can get free access of sunlight and air. Stocking of fry - Fry were kept in cistern for about 10 hours for conditioning prior to releasing in pond. Seventy fries were stocked in each hapa after proper conditioning at afternoon. Rearing of fry - The stocked fry were reared separately for 90 days. As we know this fish species is omnivorous and required high amount of protein, three supplemental feeds i.e. Suny feed (trade name), Mixed (prepared) and Saudi-Bangla feed (trade name) containing 24%, 28.45% and 35% protein were applied for the culture of fish respectively. Method of feed preparation - The required quantities of all ingredients mixed with hand (prepared feed) and spread it to the pond surface. The other feeds i.e. Suny feed and Saudi Bangla feed were purchased from Swadeshi Bazar, Mymynsingh town. Feeding strategy - The experimental fish were fed in two times a day at 09.00 am and 5.00 pm. The quantity of feed was adjusted every 15 days on the basis of increase in the average body weight of the stocked biomass. Feeds were given twice daily (9.00 am and 5.00 pm) at the rate of 100%, 80%, 40%, 20%, 10% and 5% of their body weight respectively. Sampling procedure - The culture potentiality on the growth under the different feeding strategy was assessed by recording the rate of growth in terms of gain in length (cm) and in weight (g) of fish every fifteen days. The length and weight were recorded by random sampling of 10 fishes from each hapa by using a small seine net. Weight was taken with a spring balance (DONGIL-15 kg x 50 g) and length with a measuring scale. All the data recorded in a note book and spread sheet and then finally calculated the average length and weight of fishes according to treatment on each sampling day. Economic analysis - An economic analysis was performed to estimate the net profit from different treatments. The net return/profit was measured by deducting the gross income from the gross cost per hapa. The benefit cost ratio was also measured as a ratio of gross income to gross cost. A simple economic analysis performed to estimate the net profit. The cost of inputs based on the Mymensingh whole sale market price (2006). The cost of Suny feed was Tk19/ kg, mixed feed Tk 20 / kg and Saudi Bangla feed Tk 23 / kg. The selling price for Thai koi (A. testudineus) was estimated as Tk 300/kg. Statistical analysis - One way analysis of variance (ANOVA) was used for statistical of the experimental data followed by Duncan’s Multiple Range Test to determine the significance of variation among the treatments mean. Standard (±error) of treatments means were calculated from the residual mean square in the analysis of variance.

Source of Information: BANGLADESH RESEARCH PUBLICATIONS JOURNAL; ISSN: 1998-2003, Volume: 4, Issue: 1, Page: 15-23, May-June, 2010

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Achievement/Findings:

The best growth was found from the prepared and Saudi-Bangla fish feed while the poorest growth was found from the Suny feed. There was no significant difference in survival rates. Economic analysis reported that Mixed feed provided maximum profit compared with other feeds. The present study revealed that prepared feed might be used for mass production of Thai koi in hapa in Bangladesh.

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