Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Study of Aquatic Biodiversity of Nethai River in Bangladesh

B. K. CHAKRABORTY
Directorate of Fisheries, Bangladesh

M.J. A. MIRZA
Bangladesh Agricultural University, Mymensing-2202, Bangladesh.

Abstract/ Executive Summary:

A total number of 57 species of fishes, three species of prawn, one species of crabs and four species of reptiles were identified so far from the Nethai River in Bangladesh. About 10 types of fishing gear and craft were found in operation. Increasing rate of seine net (Kapuri jal) and gill net (current jal) were identified as detrimental gear killing including different species during post spawning periods. The increasing rate in exploitation of the water bodies a thread to aquatic biodiversity of the Nethai River. The total production of upper and lower stretch was decreased from 82.79 to 37.25 mt and 92.82 to 41.45 mt within five years and the total production had sharply decreased from 100% to 42.62% and 100% to 44.07% over the same period. As a result, a number of commercial important fish species like as major carps, mohasher (Tot tor, Tor putitora), nandina (Labeo nandina), olive barb (Puntius sarana) and reptiles (Kachuga kachuga and Morenia petersi) was extinct.

Keywords: Biodiversity, Extinct, Endangered, Vulnerable, Lower risk

Location: Netrakona district.

Start Date: 00-00-2001

End Date: 00-00-2005

Program Area: Conservation and Biodiversity

Commodity: Aquatic animal

Objectives:

To determine the abundance, species combination, catch statistics and related aspects of Nethi River

Methodology:

The present study was conducted during 2001-2005 with particular emphasis on soil and water quality, biological productivity and biotic communities and status of fishery exploitation. For this purpose the river course was divided into upper and lower stretches. 1. The river courses of Bhuynpara and Dhigolbadh (boarder of India) to Kalshindur constitute the Upper stretch and 2. Kalshindur to Roykandulia village via Rangsingpore had constituted the Lower stretch, in which the Nathai joins with the Kangshow River. Water Quality Parameters, plankton and sampling of fish: Water temperature was recorded using a Celsius thermometer and transparency was measured by using a Secchi disc of 20 cm diameter. Dissolved oxygen and pH were measured directly using a digital electronic oxygen meter (YSI Model 58) and an electronic pH meter (Jenway Model 3020). Alkalinity was determined by titrimetric method. The plankton sample was collected every week using 0.55 blotting silk plankton net and later analyzed numerically with the help of Sedgewick- Rafter counting cell (SR-cell) under a compound microscope. Calculation of the abundance of plankton was done. Each stretch of the river was sampled simultaneously during winter (mid November to February), premonsoon (February to April), monsoon (May to August) and post monsoon (September to mid November) for assessment of fish abundance and availability. The present study, being a rapid survey, gives only a broad picture of a stock of fishes, crabs and reptles that could be obtained through market survey (Ghoshgaon bazar, Kalshindur bazar, Rangsingpore bazaar, Purakandulia bazaar, Charuapara bazar and Dhubaura bazar) and interaction with fisherman in the riverside and even in the river. The data were analyzed through one way ANOVA using MSTAT followed by Duncan’s Multiple Range Test to find out whether any significant difference existed among treatment means.

Source of Information: Journal of crop and weed 2(2) : 20-30 (2006)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The total production of upper and lower stretch was decreased from 82.79 to 37.25 mt and 92.82 to 41.45 mt within five years and the total production had sharply decreased from 100% to 42.62% and 100% to 44.07% over the same period. As a result, a number of commercial important fish species like as major carps, mohasher (Tot tor, Tor putitora), nandina (Labeo nandina), olive barb (Puntius sarana) and reptiles (Kachuga kachuga and Morenia petersi) was extinct.

Knowledge Management: Journal