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

Primary Production and Fish Yield Estimation in the Meghna River System, Bangladesh

K.K.U. Ahmed
Bangladesh Fisheries Research Institute Riverine Station, Baburhat, Chandpur-3602 Bangladesh

S.U. Ahamed
Bangladesh Fisheries Research Institute, Riverine Station, Baburhat, Chandpur-3602 Bangladesh

G.C. Haldar
Bangladesh Fisheries Research Institute, Riverine Station, Baburhat, Chandpur-3602 Bangladesh

M.R.A. Hossain
Bangladesh Fisheries Research Institute, Riverine Station, Baburhat, Chandpur-3602 Bangladesh

T. Ahmed
Bangladesh Fisheries Research Institute, Riverine Station, Baburhat, Chandpur-3602 Bangladesh

Abstract/ Executive Summary:

This study was carried out in four selected stations (Mohonpur, Kaligonj, Charludua and Daulatkhan) in the Meghna river system, Bangladesh between the latitude 22°35.494NN - 23°23.987 N and longitude 90°35.793 E - 90°49.061 N E. Average net primary production (NPP) and gross primary production (GPP) (gC·m^3·h) in the euphotic zone of the Meghna river were 0.089 ± 0.021 and 0.161 ± 0.025 respectively. The rate of conversion of GPP into NPP ranged between 48.17 and 62.63% with an average of 54.72 %. The mean ratio of NPP to GPP (NPP:GPP), NPP:Respiration and average percent respiration rate to GPP were 0.549 ± 0.060, 1.251 ± 0.320 and 45.04 ± 6.02% respectively. The mean photosynthetic production for the day (gC·m³·day) and year (gCm·3·yr) were 1.930 and 704.45 respectively. Annual computed fish yield in relation to gross carbon synthesis was 7.0 kg fish·m³+year, The actual production of fish from the Meghna river is accounted about 0.21 % of the estimated production. The gross energy production (Kcal energy·m³·day) by the producers was estimated about 18.0. The NPP of phytoplankton established a high significant negative correlation (r = -0.975; p < 0.01) with water temperature and low, but a definite negative correlation existed (r = -0.767) between GPP and water temperature.

Keywords: Fish Yield, Production, Meghna River

Location: Mohonpur, Kaligonj, Charludua and Daulatkhan

Start Date: 00-07-2002

End Date: 00-06-2003

Program Area: Resource Development and Management

Commodity: Fish

Objectives:

To determine water pH and specific conductance respectively.

Methodology:

This study was carried out in four selected stations viz., Mohonpur, Kaligonj, Charludua and Daulatkhan in the Meghna river system between the latitude 22°35.494N N - 23°23.987 N and longitude 90°35.793 E - 90°49.061N E. Samplings were conducted during winter and summer seasons, during July 2002 to June 2003. Collection of samples and necessary preservation for various physicochemical parameters and their estimation were carried out following Standard Methods. Temperature (Air and water), transparency, dissolved oxygen (DO), free carbon dioxide (CO₂), total water hardness, total alkalinity, total dissolved solids (TDS) and chemical oxygen demand (COD) were determined following APHA. Ammonia and nitrite were estimated using a HACH water test kit. Conductivity and pH meter were used to determine water pH and specific conductance respectively. The euphotic zone was measured by a Secchi disc. Primary production was estimated by the oxygen measurment method and the rate of changes in oxygen level were determined by the classical "Light and dark bottle" technique. To determine of primary production, representative water samples of the euphotic zone were collected at the onset of sunrise from the mid-euphotic level with the help of a Kemmerer water sampler and both light and dark bottles were hung immediately in duplicate in the water at the same depth and incubated for half the period of the day length. The data was extrapolated in different forms using standard coefficient. Replicate plankton samples, each of 50 L, were collected from various spots around each station by means of a bucket and filtered through bolting silk plankton net of 50 µ. The filtrate was transferred to another bottle and preserved immediately in 1: 1 00 Lugol's solution. Qualitative and quantitative analysis of phytoplankton were done following drop count method.

Source of Information: Asian Fisheries Science 18 (2005): 95-105; Asian Fisheries Society, Manila, Philippines

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Based on the conversion of gross carbon production into fish production, the annual yield of fish from the Meghna river was estimated to be 7.0 kg fish·m³·year. The actual production of fish from the Meghna river system for the year 2001-02 was 1.5 gC·m³·year (0.015 kg fish·m³·year), which is about 0.213 % of the estimated production. Based on the gross oxygen production the daily production of organic matter (g·m³·day) and plankton biomass (g·m³·day) in the Meghna river was estimated as 3.552 and 16.99 respectively. The value of fish as energy was worked out to be about 8453 Kcal energy·m³·year,

Knowledge Management: Journal