—The release of nitrogen and phosphorus from
aquaculture ponds to Selangor River, Malaysia was estimated.
The concentrations of nitrogen and phosphorus in aquaculture
ponds were always higher than those in the river, their primary
water source, indicating that the aquaculture ponds are sources
of nitrogen and phosphorus in Selangor River. From the careful
interview with aquaculture managers, the frequency of water
exchange, the number of harvesting, and the amount of feeds
added, the total volume of water released to the Selangor River
was also obtained. The total amount of nitrogen and phosphorus
added to each aquaculture pond was estimated to be about 700
kg N and 60 kg P per year, respectively. About 100-200 kg N and
10-15 kg P were estimated to be released with the waste water
per pond per year, accounting for 20-30% of nitrogen and
phosphorus in added feeds. It is important for us to precisely
estimate the fates of nutrients for the better management and
sustainable development of aquaculture industries. Our data
may help to improve aquaculture management in future.
—Rivers, aquaculture, nutrient release,
Nobuyuki Kawasaki and M. R. M. Kushairi are with Universiti Selangor,
Malaysia (e-mail: firstname.lastname@example.org, email@example.com).
Fatimah Yusoff and Norio Nagao are with Universiti Putra Malaysia,
Malaysia (e-mail: firstname.lastname@example.org,
Akio Imai and Ayato Kohzu are with National Institute for Environmental
Studies, Japan (e-mail: email@example.com, firstname.lastname@example.org).
Cite: Nobuyuki Kawasaki, M. R. M. Kushairi, Norio Nagao, Fatimah Yusoff, Akio Imai, and Ayato Kohzu, "Release of Nitrogen and Phosphorus from Aquaculture Farms to Selangor River, Malaysia," International Journal of Environmental Science and Development vol. 7, no. 2, pp. 113-116, 2016.