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Study on the Present Status of Endangered Fishes and Productivity of Teesta River Closest to Barrage Region

AKM Rohul Amin
Department of Fisheries Biology and Genetics, Hajee Mohammad Danesh Science and Technology University, Dinajpur-5200, Bangladesh

Md Rakibuzzaman Shah
Department of Fisheries Biology and Genetics, Hajee Mohammad Danesh Science and Technology University, Dinajpur-5200, Bangladesh

Md Mahmood Alam
Department of Fisheries Biology and Genetics, Hajee Mohammad Danesh Science and Technology University, Dinajpur-5200, Bangladesh

Imran Hoshan
Department of Fisheries Biology and Genetics, Hajee Mohammad Danesh Science and Technology University, Dinajpur-5200, Bangladesh

Md Abu Zafar
Department of Aquaculture, Faculty of Fisheries, Hajee Mohammad Danesh Science and Technology University, Dinajpur-5200, Bangladesh

Abstract/ Executive Summary:

This study was conducted to monitor the present condition of endangered fishes and the productivity of the Teesta river closest to the Teesta barrage situated in the Lalmonirhat district of Bangladesh. Water and sediment samples were collected twice in a month during the study period from six different (3 upstream and 3 downstream) sites with three replications for each. Required information about threatened fishes was collected from the sampling region associated with fishermen and fish markets. The study disclosed over 50 threatened fish species in the Teesta river including several threatened fishes namely Bagarius bagarius, Sisor rabdophorus etc. The commonly available endangered fishes were Macrognathus aculiatus, Mastacembelus armatus, Barilius tileo, Raiamas bola, Botia dario, B. lohachata etc. which are rarely available nationwide. Planktonic flora and fauna determination revealed that comparatively higher density of plankton (n >11500 per liter), as well as more number of planktonic flora (>21 nos.) and fauna (>9 nos.), were monitored in the early monsoon and monsoon season (April-September) and comparatively lower planktonic density (n<10000 per liter) and less number were found in pre-monsoon season (January-February). The investigation of benthic fauna showed that the riverine ecosystem near to barrage contained 16 species of macro-benthos from different groups. Lastly, it can be noticed that it is very essential to take all effective necessary actions to provide good productivity and conserve the ichthyo diversity of Teesta river that will help to conserve the commonly available endangered and critically endangered fishes of Teesta river.

Keywords: Teesta barrage, Endangered fishes, Phytoplankton, Zooplankton

Location: Teesta barrage situated in the Lalmonirhat district of Bangladesh.

Start Date: 00-07-2018

End Date: 00-04-2020

Program Area: Animal Health and Management

Commodity: Fisheries diversity

Objectives:

To know about the current status of endangered fishes, productivity and health status of the studied river ecosystem including seasonal variations near to Teesta barrage region.

Methodology:

The study was carried out for a period of four months from July 2018 to April 2020. The proposed research work was designed to collect fish and plankton samples from the upstream and downstream regions of the Teesta barrage in the Teesta river. For plankton sampling six different sampling sites three upstream and three downstream were selected to collect water and sediment samples from the river. Samples were collected from all selected sites fortnightly. To collect the fish samples from upstream and downstream sites fishermen using seine net (Berjal) were called for the collection of fish as well catch information. Net hauling was performed by fishermen around three hours and collected fish samples were then identified through their various morphometric and meristic characteristics. The taxonomic studies of fish were done according to (Rahman, 2005; Talwar and Jhingran, 1991). Then fish species were systematically classified according to Fishbase database, Bangladesh Species Database (bdspdb) and Integrated Taxonomic Information System (ITIS). Recorded data were then sorted and tabulated. The conservation status of fishes was confirmed was determined by following the database of IUCN Bangladesh (2015) and Bangladesh Species Database (bdspdb).

Source of Information: Res. Agric., Livest. Fish.7(3): 577-589, December 2020

Article Link (Online Journal): DOI: https://doi.org/10.3329/ralf.v7i3.51730

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The Teesta is a productive river having great potentiality to conserve the fish biodiversity. But the situation is getting degraded gradually due to various natural and manmade causes. The findings of this study demonstrated that the availability of the threatened fishes is reducing gradually in the Teesta river although some endangered and critically endangered fishes are still commonly available. The monitored productivity indicators particularly the availability of planktonic flora and fauna showed comparative better condition in early monsoon and monsoon season than pre-monsoon and late monsoon season. Finally, it can be concluded that it is very essential to take all effective necessary actions to provide good productivity and to conserve the ichthyo diversity of Teesta river that would also be helpful to conserve the commonly available endangered and critically endangered fishes of Teesta river.

Knowledge Management: Journal