Ecology and fish community in Nong Han swamp, Sakon Nakhon province

• Published in: Thai Fisheries Gazette (Thailand)
• Main Authors: Santana Duangsawasdi(Department of Fisheries, Bangkok (Thailand)), Boonsong Sricharoendham(Department of Fisheries, Bangkok (Thailand)), Piengchai Kaewjaroon(Department of Fisheries, Bangkok (Thailand)), Malee Aimsab(Department of Fisheries, Bangkok (Thailand)), Wichamai Somchan(Department of Fisheries, Bangkok (Thailand)), Niran Promkhruan(Department of Fisheries, Bangkok (Thailand))
• Format: Journal Article
• Language: Thai
• Published: 01.01.2004
• Subjects: Aquatic animals; Aquatic communities; Aquatic organisms; Aquatic plants; Biodiversity; Fishes; Freshwater ecology; Plankton; Population density; Thailand
• ISSN: 0125-6297

Study on ecology and fish community in Nong Han Swamp, Sakon Nakhon province was investigated from November 1999 to August 2000. Field surveys were conducted on water quality, plankton, benthos, aquatic vegetation and fish fauna during 4 sampling periods at 6 stations. The various community and ecological indices and multivariate method of cluster analysis and multi-dimensional scaling were used for data analysis. The results showed that water quality parameters were all within the normal range and considered suitable for fisheries. Seventy-nine phytoplankton species and twenty-four zooplankton species were found with an average amount of 1.256*10**(6) and 0.113*10**(6) unit/ cubic m, respectively. Synedra sp., Staurastrum sp., Peridinium sp. and Spyrogyra sp. were the dominant planktonic species. For benthic fauna, 32 species were found in an average of 1,028+-1,096 ind/square m with Naididae, Chironomidae, Tubificidae, Idiopoma sp. and Corbicula sp. were dominated. Aquatic vegetation belonged to 39 species with 19 species are the marginal type. There were 56 fish species of 21 families in which 19 species belonged to cyprinid. Fish community provided an average standing crop of 10.95+-9.38 kg/rai. Piscivorous and insectivorous fishes, Trichogaster trichopterus, Trichogaster pectoralis, Notopterus notopterus, Osteochilus hasselti, Tetraodon cambodgensis, Channa striata, Pristolepis faciata, Nandus oxyrhynchus, Cyclocheilichthys apogon and Hampala dispar dominated in terms of biomass. The average Shannon-Wiener diversity index of plankton, benthic fauna and fish community were relatively high value at 4,505+-0.602, 2.622+-0.528 and 2.990+-0.370, respectively. The community structure according to major fish groups comprise of 29.85 percent carps, 0.94 percent catfishes, 5.85 percent murrels, and 63.36 percent miscellaneous. Majority of dominant species and large size of fish were found at the lower part of the swamp at station 6.