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Fish Diversity of the River Choto Jamuna, Bangladesh: Present Status and Conservation Needs

Shams Muhammad Galib
Aquatic Biodiversity Laboratory, Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshah-6205, Bangladesh.

Foyzul Hassan Fahad
Aquatic Biodiversity Laboratory, Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshah-6205, Bangladesh.

Nipa Chaki
Aquatic Biodiversity Laboratory, Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshah-6205, Bangladesh.

A. B. M. Mohsin
Aquatic Biodiversity Laboratory, Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshah-6205, Bangladesh.

S. M. Abu Naser
Aquatic Biodiversity Laboratory, Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshah-6205, Bangladesh.

Abstract/ Executive Summary:

River Choto Jamuna is an important and well-known river in north-west Bangladesh in terms of fish production and source of income for many fishermen living beside where this study has been conducted from January to December, 2012. This study revealed the existing fish species and their composition along with diversity, richness and evenness indices. A total of 63 species of fishes have been recorded belonging to 41 genera, 23 families and 9 orders. Cypriniformes was recorded as the most diversified fish group in terms of both number of species and individuals observed. Of all the fishes found, 41.27% species were threatened in Bangladesh including 15.87% vulnerable, 15.87% endangered and 9.52% critically endangered species. Overall values of diversity, richness and evenness indices were found to be 3.717, 6.954 and 0.897, respectively. Finally, considering all the findings, the establishment of fish sanctuaries to conserve available fish species, both threatened and non-threatened, naturally is recommended.

Keywords: Fish diversity, Choto Jamuna, Biodiversity, Shannon-weaver diversity

Location: Naogaon distrct, Bangladesh.

Start Date: 00-01-2012

End Date: 00-12-2012

Program Area: Conservation and Biodiversity

Commodity: Aquatic animal

Objectives:

1. To carry out the first comprehensive biodiversity indices-based description of fish fauna in the river Choto Jamuna, Bangladesh.

Methodology:

Study area and duration: The present study was conducted in River Choto Jamuna at Badalgachi subdistrict (approximately 24°58’ N latitude; 88°55’ E longitude) of Naogaon distrct, north-west Bangladesh, for a period of one year from January to December 2012. The River Choto Jamuna is one of the major distributaries of River Atrai, one of the major rivers in Bangladesh. Sampling framework: Fish sampling were done monthly with the help of traditional fishing nets viz. cast nets, gill nets, lift nets and fishing traps locally known as Dohair, Britti and Kholsun. All these fishing gears were operated at the same spot within 0.5 km area to ensure harvesting of maximum species of study site in the catch. Gill net and fishing traps were set in late afternoon and left overnight to be checked in the morning. When cast and lift nets were employed, twenty throws and fifteen hauls were made for cast and lifts net, respectively. Immediately after harvesting, the fishes were counted on the spot. In this way, a total of 7449 individuals of recorded fish species were counted and categorized during the period of study. However, species that seemed difficult to indentify on spot were preserved in 7 to 10% buffered formalin solution and transported to the Aquatic Biodiversity Laboratory of the Department of Fisheries, University of Rajshahi, Rajshahi, Bangladesh for identification and further study. These species were identified after analyzing their morphometric and meristics characters under laboratory situation. Identification of the fishes: Fish fauna harvested from the study area were identified based on their morphometric and meristics characters1). After identification, fish species were systematically classified. Biodiversity parameters: To understand the seasonal diversity of fishes in the study area, month-wise data were collected. In this study, the diversity, evenness and richness indices were calculated.

Source of Information: Int. J. Biodivers. Conserv. Vol. 5(6), pp. 389-395, June 2013

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

A total of 63 species of fishes have been recorded belonging to 41 genera, 23 families and 9 orders. Cypriniformes was recorded as the most diversified fish group in terms of both number of species and individuals observed. Of all the fishes found, 41.27% species were threatened in Bangladesh including 15.87% vulnerable, 15.87% endangered and 9.52% critically endangered species. Overall values of diversity, richness and evenness indices were found to be 3.717, 6.954 and 0.897, respectively. Finally, considering all the findings, the establishment of fish sanctuaries to conserve available fish species, both threatened and non-threatened, naturally is recommended.

Knowledge Management: Journal