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New Record of Some Freshwater Mussels (bivalvia: Unionidae) from North-east Bangladesh

Mahiuddin Md. Shahjahan Bhuiyan
Barura Shahid Smriti Govt. College, Comilla, Bangladesh

Minu Haque
Dr. Khandaker Mosharraf Hossain College, Daudkandi, Comilla, Bangladesh.

Md. Sarwar Jahan
Institute of Environmental Science, University of Rajshahi, Rajshahi-6205, Bangladesh.

Md. Redwanur Rahman
Institute of Environmental Science, University of Rajshahi, Rajshahi-6205, Bangladesh.

Abstract/ Executive Summary:

A total of 6 species of freshwater mussels under the family Unionidae, order- Unionoida were collected, which are new records for Bangladesh. The information on the distribution and ecology, population density and seasonal variation of Lamellidens phenchooganjensis, L. indawgyiensis, L. generosus, Parreysia (Parreysia) favidens var. assamensis, P. (P.) var. marcens and P. (P.) var. viridula were provided in this paper. Population density and morphometric parameters were measured. Moreover, economic importance and economic role were stated.

Keywords: Freshwater Mussels, Bivalvia, Unionidae, Bangladesh, new records

Location: Brahmanbaria, Comilla, Habiganj, Moulvibazar, Sylhet and Sunamganj districts of North-East Bangladesh

Start Date: 00-00-2005

End Date: 00-00-2007

Program Area: Animal Health and Management

Commodity: Aquatic animal

Objectives:

1. The present study was to identify, morphometrics, population density and economic importance of freshwater mussel collected from Brahmanbaria, Comilla, Habiganj, Moulvibazar, Sylhet and Sunamganj districts of North-East Bangladesh.

Methodology:

Study area: The Northeastern region of Bangladesh includes the present districts of Brahmanbaria, Comilla, Habiganj, Moulvibazar, Sylhet and Sunamganj. This region covers a land area of 13,938.65 sq.km situated between 23°2´ to 25°2´N latitude and longitude 91°7´ to 92°41´E. The region abounds in freshwater systems including wetlands in the floodplains crossed by rivers like Surma, Khusiyara, Peeyain, Saree, Gowain, Khowai, Sonai, Meghana, Titas, Gomoti and their tributaries, tanks, streams, pools and marsh lands. Triplicate sampling were done in ponds from each districts of Brahmanbaria, Comilla, Habiganj, Maulvibazar and Sylhet and five sampling sites each in the river Surma, Khusiyara, Ratna, Titas and Gomoti representing lotic habitat. From each site three quadrates of 1m² area were taken according to the depth of water (viz. 0-50cm, 50-100cm and 100-200cm) in respect of Summer, Monsoon and Winter season. A total of 540 quadrates were explored in course of two years (2005-2007) study period. Collection method: Mussels were collected by hand dredge. By hand picking in cases of bigger specimens from the small ponds and slow moving river. In small ponds the collection made by scooping the bottom mud and then put into sieve and washed with water. Some cases in river samples were collected by Ekman dredge. Cleaning: Mussels shells were washed and cleaned by (i) Bleeching method: 300 grams of bleeching powder was dissolved in 4 liters of tap water. Shells were left for 24 hours. After the shells were taken on a tray and cleaned foreign particles (sand, mud etc.) by using brush and rewashed. After washing the shells were dried in sunlight. (ii) HCl acid wash: A mixture of concentrated hydrochloric acid and water in ratio of 1:7 was prepared. Treatment time depends upon the thickness and dirtiness of the shells. After acid wash the shells were dried in sunlight. Preservation: For biometric analysis mussels were preserved in the 70% ethyl alcohol in plastic jars for futher studies. Identification: Dry shells were separated on the basis of similarities and dissimilarities of characters and packed in small polythyne bags and records were maintained. Different books were consulted for identification of species and confirmed from the Mollusca Division of the Zoological Survey of India, Kolkata. Morphometrics: Various morphometric measurements were taken with the help of a divider and slide calipers from randomly collected species from the natural habitats. Photographs were taken by Olympus FE-230.

Source of Information: Bangladesh J. Zool. 41(1): 29-42, 2013

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In the present study and past is total of 22 freshwater bivalves were recorded from the different habitats of Bangladesh. In this study six new records were reported from Bangladesh. P. (R) caerulea sub sp. gaudicahaudi, P. (R.) occata and Pisidium clarkeanum were reported earlier in Fauna of British India from the study area but did not encounter during the present investigation.

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