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Physico-chemical Aspects of Chandbill Oxbow Lake of Meherpur, Bangladesh

A.K.M. NAZRUL KABIR
Advanced Fisheries Research Laboratory (AFRL), Department of Zoology, University of Dhaka, Dhaka‐1000, Bangladesh A Part of the Ph.D. dissertation of first author (AKMNK).

M. NIAMUL NASER
Advanced Fisheries Research Laboratory (AFRL), Department of Zoology, University of Dhaka, Dhaka‐1000, Bangladesh

Abstract/ Executive Summary:

Some physico?chemical parameters of Chandbill Baor, a natural oxbow lake of Meherpur district were studied from September 2006 to August 2007. Air temperature of the study area varied from 18.10 to 32.10°C (x± SE : 27.73 ± 1.22°C). The Water temperature (17.10 to 32.10°C; x± SE: 28.24 ± 1.32°C), Secchi disc depth (8.89 to 53.34 cm; x± SE : 26.19 ± 4.29 cm), water depth (132.08 to 307.34 cm; x± SE : 183.93 ± 13.88 cm); total alkalinity (51.3 to 85.5 mg/l; x± SE : 68.4 ± 3.64 mg/l), total hardness (85.5 to 188.10 mg/l; x± SE : 125.81 ± 9.38 mg/l), dissolved oxygen (5.0 to 12.0 mg/l; x± SE: 8.42 ± 0.62 mg/l), free CO2 (5.0 to 30.0 mg/l; x± SE : 14.58 ± 2.64 mg/l), pH (8.0 to 10; x± SE : 8.54 ± 0.19), ammonia?nitrogen (0.3 to 0.7 mg/l; x± SE: 0.46 ± 0.04 mg/l) in the ‘Baor’ water were found to be suitable for survival of aquatic fauna. Nitrite?nitrogen was absent in the ‘Baor’ throughout the year. Positive correlations were observed in between air and water temperature (r = 0.978); free CO2 and Secchi depth (r = 0.839), free CO2 and water depth (r = 0.714); water depth and Secchi depth (r = 0.903); total hardness and total alkalinity (r = 0.861) and pH with DO (r = 0.661). However, inverse relations were observed among ammonia?nitrogen with water depth (r = −0.727); ammonia?nitrogen with Secchi disc depth (r = −0.840); dissolved oxygen with free CO2 (r = −0.636); pH with Secchi disc depth (r = −0.581) and pH with free CO2 (r = −0.825). The productivity of the lake was found to be medium and could be improved to higher level. Alkaline pH (8.54 ± 0.19) was supposed to be helpful for proper growth and development of fishes and aquatic organisms. This is the first limnological report from a natural ‘Baor’ (Oxbow lake) of Meherpur district, Bangladesh.

Keywords: Physico‐chemical aspects, Oxbow lake, Meherpur

Location: Chandbill baor is located very close to Kajla river, at village Chandbill of Amjhupi union, Sadar upazilla, Meherpur district

Start Date: 00-09-2006

End Date: 00-08-2007

Program Area: Resource Development and Management

Commodity: Water quality

Objectives:

1. To investigate the some important physico?chemical factors of the Chandbill Baor, a natural oxbow lake of Meherpur district, Bangladesh.

Methodology:

Chandbill baor is located very close to Kajla river, at village Chandbill of Amjhupi union, Sadar upazilla, Meherpur district. Three stations (A,B and C) were selected for sampling. The Baor is more or less rectangular in shape with an area of 37.90 ha and it is surrounded by paddy fields. The depth of the Baor varied from 132.08 to 307.34 cm. The soil of the Baor is clay loamy to sandy loamy with mixed up of organic debris. The villagers use the Baor for bathing, washing, fishing and irrigating paddy field during dry season. The Baor is rich in fish fauna and 10 ? 12 fishermen engaged in catching indigenous fishes daily in the Baor. Presently local ‘Matshyajibi Samity’ manage the Baor and introduce indigenous and exotic carps following semi?intensive culture method. A fish landing centre has constructed close to Chandbill Baor for quick transportation of harvested fishes. Monthly water samples were collected from approximately 10 ? 15 cm below the surface level of water at 100 ? 200 cm depth ranges using wooden boat during the study period from September, 2006 to August, 2007. Collection of water was restricted within the reference area (A, B and C shown in Plate 1) of the Baor. The bottle was allowed to sink up to the desired depth and its mouth was opened and filled up and the cap locked underwater before taken out of water. Caution was taken to avoid any air bubble in side the bottle. Immediately after collection the water samples were analyzed. Chemical parameters of water such as DO, free CO2, hardness, alkalinity, pH, ammonia?nitrogen and nitrite?nitrogen of the Baor were measured monthly by using HACH water testing kit (Model FF?1A, USA). Water and air temperatures were recorded using mercury thermometer. Water depth was measured with the help of graduated centimeter scale. Transparency was measured by using a Secchi disc of 20 cm in diameter. Statistical analysis was done following methods described by Zar(20). The mean (x) is associated with standard error (± SE) value. Correlation was calculated by using SPSS® (Version 11.5, 2007. Systat, Inc. USA), a computer based program for Windows®.

Source of Information: Dhaka Univ. J. Biol. Sci. 20(1): 31‐39, 2011 (January)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The productivity of the Chandbill Baor was medium to high. The alkaline pH (x± SE : 8.54 ± 0.19) in the Baor water was seemed to be helpful for proper growth and development of fishes and aquatic organisms.

Knowledge Management: Journal