Koydon, S., Is-haak, J. and Ngamphongsai, C. 2025. Nitrogen Balance of Intensive Snakehead Fish Culture in Earthen Ponds under Different Water Exchange Frequencies: a Case Study of Ang Thong Fisheries and Processing Cooperative . Burapha Science Journal. 30, 2 May-August (Jun. 2025), 511–528.