Cooperative Research Units
Education, Research And Technical Assistance For Managing Our Natural Resources
Home | Intranet | Digital Measures | Help

Stockton, K. A., C. M. Moffitt, B. J. Watten, and B. J. Vinci. 2016. Comparison of hydraulics and particle removal efficiencies in a mixed cell raceway and Burrows pond rearing system. Aquacultural Engineering 74:52-61.

Abstract

tWe compared the hydrodynamics of replicate experimental mixed cell and replicate standard Burrowspond rearing systems at the Dworshak National Fish Hatchery, ID, in an effort to identify methods forimproved solids removal. We measured and compared the hydraulic residence time, particle removalefficiency, and measures of velocity using several tools. Computational fluid dynamics was used first tocharacterize hydraulics in the proposed retrofit that included removal of the traditional Burrows ponddividing wall and establishment of four counter rotating cells with appropriate drains and inlet water jets.Hydraulic residence time was subsequently established in the four full scale test tanks using measures ofconductivity of a salt tracer introduced into the systems both with and without fish present. Vertical andhorizontal velocities were also measured with acoustic Doppler velocimetry in transects across each ofthe rearing systems. Finally, we introduced ABS sinking beads that simulated fish solids then followed thekinetics of their removal via the drains to establish relative purge rates. The mixed cell raceway providedhigher mean velocities and a more uniform velocity distribution than did the Burrows pond. Vectorsrevealed well-defined, counter-rotating cells in the mixed cell raceway, and were likely contributingfactors in achieving a relatively high particle removal efficiency-88.6% versus 8.0% during the test period.We speculate retrofits of rearing ponds to mixed cell systems will improve both the rearing environmentsfor the fish and solids removal, improving the efficiency and bio-security of fish culture. We recommendfurther testing in hatchery production trials to evaluate fish physiology and growth.

 

Current Staff

Federal Staff: 3

Masters Students: 6

Phd Students: 3

Post Docs: 0

University Staff: 4

5 Year Summary

Students graduated: 25

Scientific Publications: 80

Presentations: 237

 

Status

Published
April (2nd Quarter/Spring) 2016

Access

Download File

Unit Authors

  • Kelly Stockton
  • Christine Moffitt
  • Barnaby Watten

Idaho Cooperative Fish and Wildlife Research Unit Cooperators

  1. Idaho Department of Fish and Game
  2. U.S. Fish and Wildlife Service
  3. U.S. Geological Survey
  4. University of Idaho
  5. Wildlife Management Institute