Author(s)

Joshua M. A. Caasi¹, Eric Krebs², Nathan Huysman², Jill M. Voorhees², Michael E. Barnes^2*

¹School of Engineering, Benedictine College, Atchison, Kansas, USA.
²McNenny State Fish Hatchery, South Dakota Department of Game, Fish and Parks, Spearfish, South Dakota, USA.

Structures separating fish hatchery ponds from open spring water sources must restrict fish movement from the pond to the spring, allow for constant water flow, and potentially reduce incoming spring water gas supersaturation. This article describes a novel inlet structure that fulfills those requirements. In addition, it requires minimal maintenance, and allows for the quick and easy removal of debris in the event of partial plugging. This simple aluminum structure consists of a mount for attachment to the inflow pipe and a terminal splash plate with aeration holes. The splash plate is perpendicular to the water flow during normal operations to both prevent fish from jumping into the pipe and aerate the incoming water. However, it can be easily swiveled upward for the efficient removal of debris. Use of the inlet structure consistently decreased gas supersaturation in the spring water as it entered the fish production pond. By decreasing gas levels and maintaining water flows, potentially hazardous fish health issues can be avoided by using this structure. In addition, this relatively inexpensive and simple device will greatly reduce the labor required for removing debris compared to traditional screens.

Fish Hatchery, Rearing Pond, Splash Plate, Inlet Structure, Total Gas Pressure

Caasi, J. , Krebs, E. , Huysman, N. , Voorhees, J. and Barnes, M. (2020) A Degassing Inlet Structure for Aquaculture Ponds. World Journal of Engineering and Technology, 8, 159-167. doi: 10.4236/wjet.2020.82013.