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Study on Some Aspects of Biology of Prawns from North East and North West Regions of Bangladesh

A.S.M. Saifiillah
Department of Environmental Science and Resource Management, Mawlana Bhashani Science and Technology University, Santosh, Tangail, Bangladesh

Nazim Uddin
Institute of Marine Sciences, Chittagong University, Chittagong, Bangladesh

Yusuf Sharif Ahmed Khan
Department of Environmental Science and Resource Management, Mawlana Bhashani Science and Technology University, Santosh, Tangail, Bangladesh

Sardar M.A. Jabber
Department of Environmental Science and Resource Management, Mawlana Bhashani Science and Technology University, Santosh, Tangail, Bangladesh

Md. Sayedur Rahman
Institute of Marine Sciences, Chittagong University, Chittagong, Bangladesh

Abstract/ Executive Summary:

The present study reports the sex ratio and fecundity of four prawn species (Macrobrachium lamarrei, Macrobrachium malcolmsonii, Macrobrachium dolichodactylus and Macrobrachium dayanus) from the northeast (Sylhet, Maulavi Bazar and Sunamganj districts) and northwest (Pabna, Sirajganj and Natore districts) parts of Bangladesh. Females were more common than males in each species with male-female being 1:17.5, 1:1.1, 1:2.6 and 1:1.6, respectively, although this result was statistically significant only for the first species. Fecundity (mean±SD) of the studied species was found to be 228±69, 6234±2390, 2187±729 and 153±22 eggs per female, respectively. Fecundity in all the species was found directly related to total length, standard length and total weight.

Keywords: Sex ratio, Fecundity, Prawn, Bangladesh

Location: Sylhet, Maulavi Bazar and Sunamganj, Pabna, Sirajganj and Natore districts

Start Date: 00-04-1998

End Date: 00-07-1998

Program Area: Variety and Species

Commodity: Prawn

Objectives:

To estimate the sex ratio and fecundity
To establish a mathematical relationship of fecundity with total length, standard length and body weight for four economically important prawn species

Methodology:

Samples were collected from 20 sites of the northeast region (Sylhet, Maulavi Bazar and Sunamganj districts) and 30 sites of the northwest region (Pabna, Sirajganj and Natore districts) during April-July 1998 by the authority of FAP-17. Sampling was conducted in varying locations within each site and was collected in different times (day and night), dates and months within the stipulated period. Sampling for catching prawns at each site was done randomly using a seine net with 22 micro m mesh size. Prawns were stored in the laboratory, washed, cleaned and preserved in the plastic containers with 5% formalin. Then identification of the prawn species was done consulting available national and intentional literatures for identification and systematic separation of species. The species were identified into male and female, based on the presence of appendix masculina at the second pairs of pleopods for the male and absence of it for female. Total length (TL) and standard length (SL) of a total 40 female prawns were measured to the nearest 0.01 mm. Total weight (TW) of each of the 40 female prawns was measured by means of a pan balance to the nearest 0.01 g after excess water was removed with blotting paper. The eggs of each of the species were taken separately in clean petri dishes with forceps. Then the eggs were washed with fresh water for several times. Initially water from eggs was removed by blotting paper and then it was dried at room temperature and sometimes, gentle heating under sunlight. Thus the eggs were ready for counting. Gravimetric method'" was followed in counting eggs. Data from all samples were plotted within each month for statistical analysis. Multiple regression analysis was carried out for finding the mode of affects of TL, SL and TW on fecundity, where fecundity was treated as the dependent variable and TL, SL and TW were as independent variables. SPSS/PC+ programs were used for the statistical analysis.

Source of Information: Pakistan Journal of Biological Sciences 8 (3): 425-428, 2005

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Fecundity (mean±SD) of the studied species was found to be 228±69, 6234±2390, 2187±729 and 153±22 eggs per female, respectively. Fecundity in all the species was found directly related to total length, standard length and total weight. it was also found that the number of eggs increase linearly with the increase of TL, SL and TW and these relationships were statistically significant.

Knowledge Management: Journal