R. James and K. Samapath, “Effects of feed and water quality (hardness) on growth in red swordtail Xiphophorus helleri fry”, Indian J. Fish., vol. 45, no. 3, pp. 307–313, Mar. 2017, Accessed: Oct. 22, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJF/article/view/8715