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Occurrence and Abundance of Acetes Shrimps in the Kutubdia Channel of Bangladesh Coastal Water

Mohammad Zafar
Institute of Marine Sciences, University of Chittagong, Chittagong-4331, Bangladesh

M.D. Alam
Institute of Marine Sciences, University of Chittagong, Chittagong-4331, Bangladesh

Abstract/ Executive Summary:

This investigation was carr.ied out from June 1889 to May 1990 and focuses on the occurrence and abundance of Acetes shrimps in the Kutubdia channel. The shrimps of the genus Acetes occurred throghout the year in the area of investigation. Acetes showed a bimodal peak in occurrence, one in late monsoon season (August - September) and other in premonsoon season (February - March). But the maximum number of Acetes shrimps was recorded in March (462 individuals/haul). The Acetes population of this channel was dominated by four species, Acetes erythraeus (38.50%), A. indicus (32.98%), A. chinensis (4.48%) and A. japonicus (3.32%).

Keywords: Acetes shrimps, Kutubdia channel, Coastal water

Location: Kutubdia channel

Start Date: 00-06-1989

End Date: 00-05-1990

Program Area: Animal Health and Management

Commodity: Shrimp

Objectives:

To investigate the temporal distribution of Acetes shrimps from the Kutubdia channel in southeastern coastal water of Bangladesh.

Methodology:

Sampling was made between June '89 and May '90. The area of investigation in the Kutubdia channel is situated at Lat. 21°53 13611 N and Long p II • 91°54 54 E which is laterally fed by tributaries of rivers. On the south-eastern side of the channel, the delta of Mathamuhuri river and adjacent Chakaria mangrove forest. Most of the shoreline on the two sides of the channel is covered by poor mangrove vegetation and natural uloo grass (/mperata cylindrica and Urigrass oryza ), with the adjacent land consisting of coastal salt pans being used for salt extraction during dry season and aquaculture afterwards. This channel is a good spawning and nursery ground for a number of commercially important fish and shrimps. Four stations were selected for hydrobiological samples. Zooplankton samples were collected during new moon period at every month by a triangular push net made of ordinary nylon cloth having a mesh size of 750 micro meter. The net, which consisted of a flattened conical bag, measured 2.5 m, and had a mouth of 3.6 m. Samples were collected during the spring tides from shallow waters (depth 1. 2 m) by pushing and dragging the net on the bottom for 15 minutes at a time against tide. Samples were immediately preserved in 5% formalin. Concurrently during the sampling time surface water temperature was recorded· by a bucket thermometer. Salinity and dissolved oxygen were recorded following standard procedures and pH was recorded by a digital pH meter. Data on atmospheric temperature and rainfall were obtained from the Meterological Department Kutubdia, Bangladesh. In the laboratory the Acetes shrimps were identified from zooplankton samples. Analysis of variance, correlation and regression are used for data analyses.

Source of Information: Bangladesh J. Fish. Res., 1(2): 91-96, July, 1997

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It appears from this study that usually the Acetes shrimps in the Kutubdia channel have a bimodal peak in occurrence,· one in premonsoon season (February - March) and other in late monsoon season (August - September). The abundance of four species of Acetes in the Kutubdia channel shows no significant correlation with recorded hydrological parameters . But Acetes indicus and A. erythraeus shows negative relation and A. chinensis and A. japonicus positively related with salinity. There is no published work on Acetes specially ecology, temporal distribution in the coastal waters of Bangladesh.

Knowledge Management: Journal