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¹ Laboratory of Fish Ecophysiology, Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
² Department of Fisheries Management, Patuakhali Science and Technology University, Dumki, Patuakhali 8602, Bangladesh DOI : 10.4194/AQUAST1309 Viewed : 1420 - Downloaded : 1503 Globally, the quality and high cost of fish feed are vital issues for the development of sustainable aquaculture and food security. Present study was investigated in 4 treatments to find out the compatible species combination for polyculture using Asian watergrass as natural feed for fish in the tidally flooded coastal wetlands for a period of 6 months. Grass carp, common carp, tilapia, mrigal and silver barb were stocked in different species combination with an identical density of 12500 fish ha^-1. In all treatments, grass carp and common carp were commonly stocked but other 3 species were disparate to stock among the treatments. Important water quality parameters were monitored those were suitable and acceptable range for aquaculture. The survival of fishes varied from 66.7±8.3 to 91.2±2.9% irrespective of fish species. The total fish production was found significantly higher (p<0.05), 5579.04±238.74 kg ha^-1 in T₃ followed by 4582.21±200.01 kg ha^-1 in T₂, 4571.52±189.78 kg ha^-1 in T₄ and 4448.37±247.26 kg ha^-1 in T₁ respectively. The results demonstrate that the combination of grass carp, common carp, tilapia, and silver barb in T₃ was ideal compatible species for polyculture in coastal wetlands. This technique should be applied in haor, baor, beel, canals, and other water-logged areas pervaded by climate changes. Keywords : Coastal wetlands Aquaculture Compatible species combination; Asian watergrass Fish production