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Status of Aquatic Resources in Someswari River in Northern Bangladesh

B. K. CHAKRABORTY
Department of Fisheries, Bangladesh

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

Abstract/ Executive Summary:

A total number of 66 species of fishes, including three species of prawn, one species of crabs, one species of snail and four species of reptiles were so far identified from the Someswari River. About 10 types of fishing gear and craft were found in operation. Increasing rate of seine net, Kapuri jal (17.6-23.3%) and gill net, current jal (29.8-34.4%) were identified as detrimental gear resulting in mortality of bi-catch of different species during the last four years. The increasing rate in exploitation of the water bodies is a threat to the aquatic biodiversity of the Someswari River. The natural production of aquatic life in the Someswari River declined dramatically over the last four (2001-2005) years. The total production of Someswari River decreased from 95.79±6.89 to 38.61±2.83 mt over this five-year span and the total production percentage sharply decreased from 19.61% to 59.68% over the same period. As a result, six important commercial aquatic lives mohasher (Tot tor, Tor putitora), nandina (Labeo nandina), olive barb (Puntius sarana) and reptiles (Kachuga kachuga and Morenia petersi) became extinct, 56 species were facing an extremely high risk of extinction and 11 species were in the verge of extinction between 2001 and 2005.

Keywords: Aquatic Resources, Someswari River, Northern Bangladesh

Location: Birishiri, Netrokona.

Start Date: 00-00-2001

End Date: 00-00-2005

Program Area: Animal Health and Management

Commodity: Aquatic animal

Objectives:

To know the status of aquatic resources in Someswari River in Northern Bangladesh

Methodology:

Experimental design: A survey of the study area, the Someswari River was conducted during 2001-2005 with particular emphasis on soil and water quality, biological productivity and status of fishery exploitation. For the purpose of the study of soil structure, water quality and biological productivity, the river course was divided into upper and lower regions. The river courses of Bijoypur and Ranikong (boarder of India) to Shibgonj and Birishiri constitute the upper region while the Shibgonj and Birishiri to Jariya-Ganjail constituted the lower region, wherein the Someswari River joins with the Kangshow River. Study of water quality parameters: Water temperature (^oC) was recorded using a Celsius thermometer and transparency (cm) was measured using a Secchi disc (20 cm diameter). Dissolved oxygen (mg/l) and pH were measured directly using a digital electronic oxygen meter (YSI, Model 58, USA) and an electronic pH meter (Jenway, Model 3020, UK). Alkalinity was determined following the titrimetric method. The plankton sample was collected every fortnight using 0.55 mm 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. Sampling of fish: The investigation was conducted from 2001-2005 and was sampled simultaneously for winter (mid November to February), pre monsoon (February to April), monsoon (May to August) and post monsoon (September to mid November) for assessment of fish abundance and availability. Data collection: An organized sampling program spread over a reasonably long time is needed to get a true picture of the catch and composition. The present study, being a rapid survey, gives only a broad picture of the stock of fishes, crabs and reptiles that could be obtained through market survey (Kamarkhali bazar, Shibgonj bazar, Durgapur sadar bazar, Birishri bazar, Gaonkandia bazar and Jaria-Janjail bazar) and interaction with fisherman in the riverside and even in the river. Analysis of experimental data: 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: Asian Fisheries Science 23(2010):174-193

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

About 10 types of fishing gear and craft were found in operation. Increasing rate of seine net, Kapuri jal (17.6-23.3%) and gill net, current jal (29.8-34.4%) were identified as detrimental gear resulting in mortality of bi-catch of different species during the last four years. he natural production of aquatic life in the Someswari River declined dramatically over the last four (2001-2005) years. The total production of Someswari River decreased from 95.79±6.89 to 38.61±2.83 mt over this five-year span and the total production percentage sharply decreased from 19.61% to 59.68% over the same period. As a result, six important commercial aquatic lives mohasher (Tot tor, Tor putitora), nandina (Labeo nandina), olive barb (Puntius sarana) and reptiles (Kachuga kachuga and Morenia petersi) became extinct, 56 species were facing an extremely high risk of extinction and 11 species were in the verge of extinction between 2001 and 2005.

Knowledge Management: Journal