International Journal of
Fisheries and Aquaculture

  • Abbreviation: Int. J. Fish. Aquac.
  • Language: English
  • ISSN: 2006-9839
  • DOI: 10.5897/IJFA
  • Start Year: 2010
  • Published Articles: 223

Full Length Research Paper

Water hardness does not influence iodine-induced mortality of rainbow trout eyed eggs

Alex J. Rosburg
  • Alex J. Rosburg
  • Cleghorn Springs State Fish Hatchery, South Dakota Department of Game, Fish and Parks, 4725 Jackson Boulevard, Rapid City, South Dakota 57702, USA.
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Cameron Enright
  • Cameron Enright
  • Cleghorn Springs State Fish Hatchery, South Dakota Department of Game, Fish and Parks, 4725 Jackson Boulevard, Rapid City, South Dakota 57702, USA.
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Jill M. Voorhees
  • Jill M. Voorhees
  • McNenny State Fish Hatchery, South Dakota Department of Game, Fish and Parks, 19619 Trout Loop, Spearfish, South Dakota 57783, USA.
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Michael E. Barnes
  • Michael E. Barnes
  • McNenny State Fish Hatchery, South Dakota Department of Game, Fish and Parks, 19619 Trout Loop, Spearfish, South Dakota 57783, USA.
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  •  Received: 04 March 2021
  •  Accepted: 26 May 2021
  •  Published: 30 June 2021

Abstract

To evaluate the effects of water hardness on survival to hatch of eyed rainbow trout Oncorhynchus mykiss eggs during iodophor disinfection, hard (300 mg/L CaCl2) and soft water (20 mg/L CaCl2) solutions were used in combination with iodophor treatments of 0, 100, 200, 400, 800, and 1600 mg/L. Water hardness did not significantly influence egg survival-to-hatch. In addition, there was no significant interaction between water hardness and iodine concentration on egg survival. However, significant differences in egg survival due to iodine concentration were observed. Egg survival significantly decreased at 800 mg/L, with near complete mortality occurring at 1,600 mg/L. Rainbow trout eyed egg disinfection using iodine concentrations of 800 mg/L or greater are not recommended, regardless of water hardness (calcium) concentrations.

Keywords: Eyed eggs, iodophor, disinfection, rainbow trout, water hardness, mortality.