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Mono- and Polyculture of Silver Barb (puntius Gonionotus) in Deepwater Rice Systems in Bangladesh

M.N.1. MIAH
Rice Farming Systems Division, Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh

M.H. ALl
Rice Farming Systems Division, Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh

N.U. AHMED
Rice Farming Systems Division, Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh

Abstract/ Executive Summary:

In mono culture (enclosure 1), Thai sharputi performed well. Considering its present market value and the costs incurred, this kind of Thai sharputi culture earned a net return of US$17.50 (total cost of enclosure, US$171.53; gross income, US$189.03). If more azolla were available from the beginning of the season, and if recovery could be increased, the net returns could be higher. For the polyculture in enclosure 2, the average weight gain of common carp was the highest (673 g) followed by grass carp (475 g) and Thai sharputi (286 g). The high yield and good net return of US$141.25 (total cost of enclosure, US$216.69; gross income, US$357.94). Myxophyceae constituted more than 75% of the total phytoplankton, and rotifers more than 72% of the zooplankton. For the polyculture in enclosure 3, the biological performances of Thai sharputi and rohu were also encouraging. The length and weight gains for Thai sharputi were almost the same as for the mono culture . Rohu also performed better with a body weight gain of 137 g. However, mainly due to the exceptionally poor performance of catla, this system, even with supplementary feeding, gave a loss of US$23.30 (total cost of enclosure, US$184.74; gross income, US$161.44).

Keywords: Mono and Polyculture of Silver Barb, Deepwater Rice Systems in Bangladesh

Location: Farming Systems Research Site at Shuvullah, Mirzapur.

Start Date: 00-00-1991

End Date:

Program Area: Farming System

Commodity: Carp fish

Objectives:

To study the performance of silver barb (Puntius gonionotus) - called Thai sharputi or rajputi in Bangladesh - in mono- and polyculture [with grass carp (Ctenopharyngodon idella), common carp (Cyprinus carpio), catla (Catla catla) and rohu (Labeorohita)].

Methodology:

Nylon net enclosures were installed during 1991, immediately after the harvest of Boro rice. Bamboo poles (sharpened) were inserted about 0.5 m into the soil. The poles were 7 m high to facilitate increasing net heights with the rise of the flood water. Each enclosure measured 21 m x 21 m with an approximate net height of 3.5 m. However, the area per enclosure was estimated at 660 m, with a l.5 m flooding depth for most of the stocking period. The poles, erected 2 m apart, were tied horizontally with the upright ones to protect against high waves and wind. At the bottom, the net enclosures were tied with the help of bamboo pegs pushed into the soil and bricks at a distance of 0.5 m. Bricks and pegs were arranged alternately to ensure the strong attachment of the net to the soil and prevent fish escape. Fingerlings were stocked on 16 June 1991. Their sizes varied with availability of the chosen species. The stocking densities per cubic meter were I fingerling for Thai sharputi mono culture (enclosure I) and 2 fingerlings for the polyculture systems (enclosures 2 and 3). The species ratios for enclosure 2 was 0.37:0.27:0.02:0.34 (grass carp:Thai sharputi:common carp:catla) and for enclosure 3, 0.4: 0.4: 02 (catla, rohu, Thai sharputi). Supplementary feeds mainly of rice bran, wheat bran, wheat flour and oil cakes were provided at a ratio. of 3:2: 1: 1, respectively. Feeds were sup- plied twice daily at 8 a.m. and 4 p.m. at the rate of 5% of total fish body weight. Aquatic weeds, mainly duldula grass, duckweed, water spinach and azolla, were supplied to test their acceptability by different fish species. Water depth was monitored regularly.

Source of Information: The ICLARM Qyarterly, July 1994. ISSN 0116-290X

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Farming common carp, grass carp and Thai sharputi in enclosures in deepwater rice systems looks encouraging. A community approach may be the best to manage such systems. This could reduce the cost of management and make the system economically more viable. Government and nongovernment organizations could take up such pro grams with farmer cooperators for efficient utilization of this vast underutilized natural resource system of Bangladesh.

Knowledge Management: Report/Proceedings