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Abstract
A study was conducted to assess the water quality and plankton composition in Amblypharyngodon mola fish pond for a period of 4 months in Bangladesh. Nine earthen pond each with three treatments,  viz. T1, T2 and T3 were stocked with A. mola at the density of 145,000; 73,000 and 36,500 individual ha-1, respectively. Water quality parameters such as water temperature, transparency, total alkalinity, pH, dissolved oxygen, Nitrate-nitrogen, ammonia-nitrogen, phosphate-phosphorus and chlorophyll-a of the ponds water were measured. Water quality parameters (except transparency and chlorophyll-a) did not show any significant differences (P>0.05) among the treatments. The lowest PO4-P and chlorophyll-a concentration were observed in treatment T1 where 145,000 individual ha-1 of  A. mola was cultured. Plankton samples were also collected and identified throughout the study period. A total of 38 genera of phytoplankton and 13 genera of zooplankton were identified of which Chlorophyceae (20 genera) in phytoplankton population and Crustacea (9 genera) in zooplankton population were dominant. The mean value of total plankton population (×103 cells L-1) were 158.42±53.33, 191.17±62.24 and 240.17±93.37 in T1, T2 and T3 treatments, respectively and contributing to the fish production according to their availability and abundance within the treatment. The study reveals that the rural based farmers can develop an actual mechanism of plankton production in aquatic environment which could be essential necessary for the maintenance of water quality and sustainable development of small scale indigenous fish culture in Bangladesh and other developing countries.
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References
[2] Felts, R.A., F. Rajts and M. Akteruzzaman. Small Indigenous Fish Species Culture in Bangladesh. (Technical Brif). IFADEP Sub Project 2, Development of Inland Fisheries, 41pp. 1996.
[3] Ahmed, H. Promotion of small indigenous fish species (SIS)-mola based carp polyculture technology at Gazipur area of Bangladesh. M.S. dissertation, Dept. of Fisheries Management, Bangladesh Agricultural University, Mymensingh. 85 pp. 2004.
[4] Roos, N., T. Leth, J. Jakobson, S. H. Thilsted, High vitamin A content in some small indigenous fish species in Bangladesh: Prospectives for food-based strategies to reduce vitamin A deficiency. International J. of Food Sci. and Nutrit. 53:425-437, 2002.
[5] Bangladesh Sangbad Sangstha. Bangladesh Newletter. 1998.
[6] Wahab, M.A., Z.F. Ahmed, A. Islam and S.M. Rahmatullah. Effect of Common Carp, Cyprinus carpio (L) on the pond ecology and growth of fish in polyculture. Aquaculture Research, 26: 619-928. 1995.
[7] Chowdhury, M. T. H., S. Dewan, M. A. Wahab, M.J. Uddin and S. H. Thilsted. Water quality parameters of the rice fields used for rice cum fish culture. Bangladesh J. Fish., 23 (1): 25-29. 2000.
[8] APHA. Standard methods for the examination of water and wastewater (18th edition). American Public Health Association, American Water Works Association and Water Environment Federation, Washington D.C. 20005. 10-19 pp. 1992.
[9] Starling H.P. Chemical and biological methods of water analysis for aquaculturists. Institute of Aquaculture, University of Starling, Scotland, 119pp. 1985.
[10] Alam, M.J., M.E. Hoq, D.A. Jahan and M.A. Mazid. Nursery rearing of Macrobrachium rosenbergii (de Man) using hapa-nets: effects of stocking density. Bangladesh J. Fish. Res. 1(1): 09-16. 1997.
[11] Fatema, M.K. Pond ecology and production performance of tilapia (Oreochromis niloticsl) and freshwater prawn (Macrobrachium rosenbergii) in monoculture and polyculture with and without substrates. Bangladesh J. Fish. Res., 12(2): 123-130. 2004.
[12] Asaduzzaman, M. The potentials of organic farming of giant freshwater prawn (Macrobrachium rosenbergii) in Bangladesh. M.S. dissertation, Dept. of Fisheries Management, Bangladesh Agricultural University, Mymensingh. 125 pp. 2005.
[13] Kunda, M., M.E. Azim, M.A. Wahab, S. Dewan, N. Roos and S.H. Thilsted. Potential of mixed culture of freshwater prawn, Macrobrachium rosenbergii and self-recruiting small species mola, Amblypharyngodon mola in rottional rice-fish/prawn culture systems in Bangladesh. Aquaculture Research. 39: 506-517. 2008.
[14] Kohinoor, A. H. M. M. L. Islam, M. A. Wahab and S. H. Thilsted. Effect of mola (Amblypharyngodon mola Ham.) on the growth and production of carps in polyculture. Bangladesh J. Fish. Res., 2 (2): 119-126. 1998.
[15] Uddin, M.M. Effects of addition of small fish on pond ecology and production in polyculture. M.S. dissertation, Department of Fisheries Management. 2002.
[16] Ali, M.L., M.M. Rashid, S.U. Ahmed, K.R. Hasan and M.M. Alam. Effect of high and low cost brood feeds on the hatching and survival rate of freshwater prawn, Macrobrachium rosenbergii larvae. Journal of Bangladesh Agricultural University, 2(1): 135-139 pp. 2004.
[17] Asaduzzaman, M. M.A. Salam, M.A. Wahab, M.Kunda and M.B. Rahman. Effects of control of C/N ratio by low-cost carbohydrate addition on water quality and pond ecology in freshwater prawn Macrobrachium rosenbergii post-larve nursing system. Bangladesh J. Fish. Res., 10(2): 121-130. 2006.
[18] DoF (Department of Fisheries). Matshya Pokkha Sharanika (Written in Bengali). Directorate of Fisheries, Ministry of Fisheries and Livestock, People Republic of Bangladesh, 132 pp. 1996.
[19] Rahman, S.M.S. Effect of stocking density of gift strain of nile tilapia (Orechromis niloticus) and freshwater prawn (Macrobrachium rosenbergii) in periphyton based production system. M.S. dissertation, Dept. of Fisheries Management, Bangladesh Agricultural University, Mymensingh. 84 pp. 2005.
[20] Hossain, M.A. M.A.L. Siddique and M.A.H. Miaje. Development of low-cost feed for culture of giant fresh water prawn (Macrobrachium rosenbergii de Man) in ponds. Bangladesh J. Fish. Res., 4(2): 127-134. 2000.