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  • Air Pumps and Accessories
  • Aquatic Plant Care
  • Artificial Rocks
  • Aquariums
  • Bottom Drains
  • Cleaning Equipment
  • Filter Media and Bags
  • Filter Systems
  • Fire Pits
  • Fish Food and Feeders
  • Fish Health
  • Fish Holding and Measuring Tanks
  • Fish Nets and Cages
  • Fountains and Basins
  • Fountains and Nozzles
  • Heaters and De-Icers
  • Lake Management
  • Landscape Lighting
  • Plumbing and Auto-Fills
  • Pond Decorations
  • Pondless Kits and Parts
  • Pond Kits
  • Pond Lighting and Electronics
  • Pond Liner and Sealants
  • Pond Netting & Stakes
  • Predator and Pest Control
  • Pump Accessories
  • Pumps - External
  • Pumps - Submersible
  • Seasonal Products
  • Skimmers for Ponds
  • Ultraviolet Clarifiers
  • Water Testing
  • Water Treatments
  • Waterfall Filters
  • Waterfall Spillways and Basins
  • Gifts and Collectibles
  • Shop All

    • Shop by Brand

  • Aquascape
  • EasyPro
  • Atlantic
  • Matala
  • Blue Thumb
  • Lifegard Aquatics
  • Alliance
  • Outdoor Water Solutions
  • Microbe-Lift
  • Anjon
  • View all Brands

    • Oxygen Tests

    Dissolved Oxygen in your Koi Pond is important. Koi breathe by pumping water over their gills to extract essential oxygen, which is invisibly dissolved in the pond water.

    Fortunately, compared to other fish species, Koi do not require an especially high level of dissolved oxygen (DO) which makes them relatively undemanding in this area. Even when, through whatever reason, DO does fall below a koi's minimum requirement, they can adapt by coming to the surface to gulp in air as a short-term survival strategy. However, this is extremely stressful for fish and if you are witness to such an extreme change in behavior the alarm bells should start ringing.

    How Koi Respond to Oxygen Levels in Pond Water
    Oxygen Level Typical Koi Response
    3 ppm Koi begin to die
    5 ppm Koi barely survive
    7 ppm Koi will live
    8 ppm Koi will do well
    11 ppm Koi do wonderfully
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