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

Plankton Composition, Abundance and Diversity in Hilsa (tenualosa Ilisha) Migratory Rivers of Bangladesh During Spawning Season

DEWAN ALI AHSAN
Department of Fisheries, University of Dhaka, Dhaka‐1000, Bangladesh

A.K.M. NAZRUL KABIR
Department of Fisheries, University of Dhaka, Dhaka‐1000, Bangladesh

MD. MOFIZUR RAHMAN
Department of Fisheries, University of Dhaka, Dhaka‐1000, Bangladesh

SHAHAD MAHABUB
Department of Fisheries, University of Dhaka, Dhaka‐1000, Bangladesh

RUMANA YESMIN
Department of Fisheries, University of Dhaka, Dhaka‐1000, Bangladesh

MD. HASAN FARUQUE
Department of Fisheries, University of Dhaka, Dhaka‐1000, Bangladesh

MD. NIAMUL NASER
Department of Zoology, University of Dhaka,Dhaka‐1000, Bangladesh.

Abstract/ Executive Summary:

Hilsa (Tenualosa ilisha) is one of the flagship diadromous fish species of Bangladesh that migrate only through the Ganges?Meghna river system route. The biological profile of plankton from the Padma, Meghna and Tetulia reference river sites during 2011 spawning season of hilsa showed that in total of 58 taxa of plankton were present. Of which, 19 taxa (32.76%) were of phytoplankton and 39 taxa (67.24%) of zooplankton. Phytoplankton group belonged to Cyanophyceae (6 taxa), Chlorophyceae (7 taxa) and Bacillariophyceae (6 taxa) while zooplankton including Protozoa (10 taxa), Rotifera (19 taxa), Copepoda (4 taxa), Cladocera (5 taxa) and Ostracoda (1 taxon). The average abundance of plankton was recorded as 194.05 ± 82.58 indiv/l. The highest abundance of total plankton (692 indiv/l) was observed in Godagari, Rajshahi (Station 3) and was lowest (4.00 indiv/l) in Charghat, Rajshahi (Station 2). The highest abundance (49 indiv/l) of total zooplankton was observed in Godagari and lowest (1 indiv/l) in Charghat with mean value of 19.46 ± 4.12 indiv/l. The highest species richness (SR = 45) was observed in Daulotkhan, Vhola (Station 9) and the lowest (SR = 3) in Charghat (Station 2), with mean value of 17.10±4.408. Shannon?Weiner species diversity index (H?) ranged from 3.334 in Daulotkhan (Station 9) to 1.5 in Charghat, (Station 2) with mean value of 2.717 ± 0.147. Based on the plankton profile it may be concluded that the biological quality of hilsa migratory river was not alike throughout the route which may restrict the migration up to up steam and spontaneous spawning of hilsa.

Keywords: Plankton, Hilsa migration, Abundance, Composition, Diversity

Location: Ten sampling stations in the river Padma, Meghna and Tetulia.

Start Date: 00-09-2011

End Date: 00-10-2011

Program Area: Resource Development and Management

Commodity: Hilsa

Objectives:

1. To know the species composition, abundance and diversity of plankton in the riverine route of hilsa particularly in the Padma, Meghna and Tetulia river of Bangladesh during spawning season.

Methodology:

Ten sampling stations were selected in the river Padma, Meghna and Tetulia. They were: Padma river: (1) Poba; (2) Charghat and (3) Godagari of Rajshahi; Meghna river: (4) Mawa ghat of Munshiganj (Padma river); (5) Charvoirobi and (6) Madrasaghat of Chandpur; Tetulia river: (7) Bauphol of Patuakhali (Tetulia river); (8) Tajumuddin; (9) Daulotkhan and (10) Lalmohon of Bhola district. Plankton samples were collected on 15/09/11, 23/09/11, 30/09/11 and from 06/10/11 to 16/10/11. Collection of plankton was made by sieving 50 litres of habitat water from approximately 10 ? 12 cm below the surface level passed through a 25 μm mesh net and finally concentrated to 25 ml. The population of plankton accumulated in the container were then transferred to other bottle and immediately preserved in 4% formalin, labeled and then transferred to laboratory for further experimentation. Each sample was stirred smoothly just before microscope examination. One ml from agitated sample was transfer to a Sedge?wick Rafter counting cell with a wide mouth graduated pipette. The abundance of plankton was estimated by counting their presence per focus of the microscopic field. Plankton were identified by several workers(12?15). The total number of plankton per litre of water were estimated by the following formula: N = (A × C)/L where, A = Average number of plankton counted per ml concentrated sample, C = Volume of concentrated sample in ml, L = Volume of original water in Litre passed through the plankton net, N = Total number of plankton per liter of original water. Shannon?Weiner diversity index and Species evenness were calculated using standar formula.

Source of Information: Dhaka Univ. J. Biol. Sci. 21(2): 177‐189, 2012 (July)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The biological profile of plankton from the Padma, Meghna and Tetulia reference river sites during 2011 spawning season of hilsa showed that in total of 58 taxa of plankton were present. Of which, 19 taxa (32.76%) were of phytoplankton and 39 taxa (67.24%) of zooplankton. Phytoplankton group belonged to Cyanophyceae (6 taxa), Chlorophyceae (7 taxa) and Bacillariophyceae (6 taxa) while zooplankton including Protozoa (10 taxa), Rotifera (19 taxa), Copepoda (4 taxa), Cladocera (5 taxa) and Ostracoda (1 taxon). The average abundance of plankton was recorded as 194.05 ± 82.58 indiv/l. The highest abundance of total plankton (692 indiv/l) was observed in Godagari, Rajshahi (Station 3) and was lowest (4.00 indiv/l) in Charghat, Rajshahi (Station 2). The highest abundance (49 indiv/l) of total zooplankton was observed in Godagari and lowest (1 indiv/l) in Charghat with mean value of 19.46 ± 4.12 indiv/l. The highest species richness (SR = 45) was observed in Daulotkhan, Vhola (Station 9) and the lowest (SR = 3) in Charghat (Station 2), with mean value of 17.10±4.408. Shannon?Weiner species diversity index (H?) ranged from 3.334 in Daulotkhan (Station 9) to 1.5 in Charghat, (Station 2) with mean value of 2.717 ± 0.147. Based on the plankton profile it may be concluded that the biological quality of hilsa migratory river was not alike throughout the route which may restrict the migration up to up steam and spontaneous spawning of hilsa.

Knowledge Management: Journal