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Impact of Environmental Factors on Abundance and Distribution of Important Fishes in the River Meghna (shatnol-chor Alexander)

Md. Robiul Awal Hossain
Principal Scientific Officer
Bangladesh Fisheries Research Institute

Abstract/ Executive Summary:

Meghna is a significant water body, the major nursery grounds of hilsa (Tenualosa ilisha) and many other commercially important riverine fishes such as Ayre, Boal, Pangas, Rita, Shillong etc. Seasonal variations of different environmental factors are necessary to asses for abundance and distribution of important fishes of the Meghna river (Shatnol-Alexander). Air and water temperature was ranged from 14.5 to 32.00°C and 14 to 31°C in different sampling points. Transparency also varied among the study sites in a wide range which was highest 45-72cm in Harina Ghat (HG) of Chandpur and lowest 5-12cm in Chor Alexander of Laxmipur. The dominating phytoplankton was Ulothrix sp. in all the sampling points ranged from lowest 17 × 10² No./L in Shatnol of Chandpur to highest 305× 10² No./L in Hizla of Barisal except Melosera sp. (105 × 10²) in Eklaspur point of Chandpur. Brachionus sp. also was shown as the dominating zooplankton in maximum sampling points ranged from lowest 5× 10² No./L in Shatnol to highest 27 × 10² No./L in Hizla point except Nauplius in Eklaspur (3×10² No./L) of Chandpur and Chor Alexander (2× 10² No./L) of Laxmipur.

Keywords: Meghna river, Environmental factor, Fish diversity

Location: River Meghna, Bangladesh

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Fisheries diversity

Objectives:

To study the environmental factors in different season;
To study the abundance and distribution of important riverine fishes in different season; and
To find out the correlation between environmental factors and abundance and distribution of fishes

Methodology:

This study comprises the identified thirteen sampling points in and around of the respective GPS location in the Meghna river. Temperature (Air and water), transparency, dissolved oxygen (DO), free carbon dioxide (CO2), total hardness, total alkalinity were determined following APHA (1995). Ammonia and nitrite were estimated using a HACH water test kit (model-FF-2). Conductivity and pH meter were used to determined water pH and specific conductance respectively. The catch compositions of important fish species in different gear at all the sampling points were also analyzed.Replicate plankton samples, each of 50 L were collected from various spots around each sampling station by means of a bucket and filtered through bolting silk plankton net of 50µ. The filtrate were transferred to another bottle and preserved immediately in 1:100 Lugol’s solution. Qualitative and quantitative analysis of planktons were done following drop count method (APHA 1995). Identification of plankton was made following Ward and Whipple (1959) and Presecot (1962).

Source of Information: Annual Report 2017-19. 232 p.

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 600,000

Total Budget (Tk.) : NaN

Achievement/Findings:

Air and water temperature was ranged from 14.5 to 32.00°C and 14 to 31°C in different sampling points. Transparency also varied among the study sites in a wide range which was highest 45-72cm in Harina Ghat (HG) of Chandpur and lowest 5-12cm in Chor Alexander of Laxmipur. The dominating phytoplankton was Ulothrix sp. in all the sampling points ranged from lowest 17 × 10² No./L in Shatnol of Chandpur to highest 305× 10² No./L in Hizla of Barisal except Melosera sp. (105 × 10²) in Eklaspur point of Chandpur. Brachionus sp. also was shown as the dominating zooplankton in maximum sampling points ranged from lowest 5× 10² No./L in Shatnol to highest 27 × 10² No./L in Hizla point except Nauplius in Eklaspur (3×10² No./L) of Chandpur and Chor Alexander (2× 10² No./L) of Laxmipur.

Knowledge Management: Report/Proceedings