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Abundance and Composition of Zooplankton at Sitakunda Coast of Chittagong, Bangladesh

Md. Shahzad Kuli Khan
Bangladesh Fisheries Research Institute, Marine Fisheries and Technology Station, Cox’s Bazar-4700, Bangladesh

Sheikh Aftab Uddin
Institute of Marine Sciences and Fisheries, University of Chittagong, Chittagong-4331, Bangladesh

Mohammed Ashraful Haque
Bangladesh Fisheries Research Institute, Marine Fisheries and Technology Station, Cox’s Bazar-4700, Bangladesh

Abstract/ Executive Summary:

Eight groups of zooplankton were found at Sitakunda coast, Chittagong, northeastern part of the Bay of Bengal during January to June 2007. The identified groups were Appendicularia (2.46%), Chaetognatha (2 .45%), Cladocera (2.31%), Copepoda (26.05%), Ctenophora (5.86%), Crustacean zooplankton (21.64%), Ichthyoplankton (17.77%) and Meroplankton (21.45%). Abun dance of zooplankton varied from 413 to 7730 individuals/m 3 .Mangrove vegetate area (station- VI) has the highest abundant possibly due to the organic and inorganic matters dissolved in the water while ship breaking area (station- IV) has the lowest abundant. Zooplankton population was significantly (p>0.05) higher in the m angrove vegetate area than the fishermen community area and ship breaking area. The mangrove vegetate area has the highest composition (57.06%) of zoopl ankton than the fishers community area and ship breaking area (29.77% and 13.16%, respectively). Calanus sp. (12.29%) belonging to Copepods and fish eggs (9.25%) belonging to Ichthyoplankton were the most abundant and Oikopleura albicans (0.66%) from Appendicularia, Metapenaeus brevicornis (0.71%) and Metapenaeus monoceros (0.90%) belonging to Crustacean larvae were the lowest abundant species found at three major investigated area.

Keywords: Mangrove area, Zooplankton, Copepoda, Fish larvae

Location: Sitakunda coast, Chittagong, northeastern part of the Bay of Bengal

Start Date: 00-01-2007

End Date: 00-06-2007

Program Area: Conservation and Biodiversity

Commodity: Plankton

Objectives:

To provide more information on the abundance and composition of the zooplankton community on the Sitakunda Upazila coastal water, north of the Chittagong city, which is currently affected by ship-breaking activity on the shore.

Methodology:

Sitakunda coast, which is the northeastern part of the Bay of Bengal, located in between 22°22´ and 22°42´ northern latitudes and in between 91°34´ and 91°48´ east longitudes. For the present investigation this coastal area was divided into three pre define activities community with six sampling stations. Station-I (Salimpur) and station-II (Saidpur) was considered as a fishermen community area, station-III (Grisubedar Ship yard) and station-IV (PHP Ship yard) located in Bhatiari area was considered as ship breaking yard and station-V (Barabkunda) and station-VI (Muradpur) was considered as a tidal mangrove vegetate area. The sampling was conducted during January to June 2007 by using a wooden boat. Zooplanktons were collected using a net (Hydrobios model 55 μ m mesh size) ending with a cod end to retain the organisms which was towed horizontally. A flow meter (FMC 0.3) was attached within the aperture of the net to measure the amount of water displaced. At each station, the net was slanted three times for 45 minutes each while the boat was moving slowly. The sampling was taken place in the sub-surface layer (0.2m-0 .5m) of the water column. Abundance of organisms was calculated from the volume of water displaced through the plankton net and expressed as numbers of individuals per cubic meter. Immediately after collection, the samples were preserved in 4% formalin (45% formaldehyde) in 250 ml plastic bottles and labeled. Then the samples brought to the laboratory of Institute of Marine Sciences and Fisheries, University of Chittagong for qualitative and quantitative analysis. For efficient sorting, a vital stain “Rose Bengal” was added and the sample left for overnight. Zooplanktons were sorted out with the help of fine brushes, needle, forceps and an inverted microscope (Model-Axiovert 25, CFL) and Sedgwick-Rafter chamber was used for counting.

Source of Information: Agric. Livest. Fish. Vol. 2, No. 1, April 2015: 151-158

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The zooplankton abundance in the three locations showed a much different from each other. The zooplankton abundance in mangrove vegetate area was higher than the fishermen community and ship breaking area. The abundance and composition of the zooplankton can be used as an indicator of marine productivity.

Knowledge Management: Journal