Present address: United States Department of Agriculture, Agriculture Research Service, Thad Cochran National Warmwater Aquaculture Center, Post Office Box 38, Stoneville, Mississippi 38776, USA
Approximate Water and Chemical Budgets for an Experimental, In-pond Raceway System
Article first published online: 2 AUG 2012
Published 2012. This article is a U.S. Government work and is in the public domain in the USA.
Journal of the World Aquaculture Society
Volume 43, Issue 4, pages 526–537, August 2012
How to Cite
Brown, T. W., Boyd, C. E. and Chappell, J. A. (2012), Approximate Water and Chemical Budgets for an Experimental, In-pond Raceway System. Journal of the World Aquaculture Society, 43: 526–537. doi: 10.1111/j.1749-7345.2012.00576.x
- Issue published online: 2 AUG 2012
- Article first published online: 2 AUG 2012
There is increasing interest in intensive production of Ictalurid catfish in the United States and a better understanding of water quality dynamics in intensive culture is needed. Budgets for water, nitrogen, and phosphorus were estimated over a production season (March–November) for an In-pond Raceway System for channel catfish, Ictalurus punctatus, and hybrid catfish, I. punctatus×I. furcatus, with co-culture of paddlefish, Polyodon spathula, and Nile tilapia, Oreochromis niloticus. In addition to the rainfall and runoff, 70 cm of water was applied from a well to offset evaporation and seepage. Production of each kilogram of live catfish required 1.50 kg of feed and released 51.7 g nitrogen and 9.7 g phosphorus. Harvest of catfish accounted for 34.0% of nitrogen and 37.1% of phosphorus applied in feed. Seepage and overflow removed only small portions of nitrogen and phosphorus, while denitrification and ammonia volatilization removed large amounts of nitrogen. Some nitrogen accumulated in sediment. Phosphorus was harvested in fish and absorbed by pond sediment. Mechanical aeration aided in maintaining appropriate dissolved oxygen levels for fish production.