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  • A measurement for liquids to determine acidity or alkalinity. On a scale of one to 14, seven is considered neutral. Below sever is acidic and above seven is alkaline. This is a factor in the health or activity levels of fish.

  • The hydrogen ion content, or the acidity or alkalinity of any substance. Most fish prefer a neutral pH range, about 7. A low pH means acidic water; high pH is caustic or alkaline. Either condition in extreme can be harmful to fish.

    Idaho Fish and Game - Cite This Source - This Definition

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