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Water What-ifs

Effects of pH Range on Aquatic Species

Effects of pH Range on Aquatic Species
pH
Effect on Aquatic Species
3.0-3.5

Unlikely that fish can survive for more than a few hours in this range although some plant and invertebrates can be found at pH levels this low.

3.5-4.0

Known to be lethal to all salmonids.

4.0-4.5

All fish, most frogs and insects are not present.

4.5-5.0

Mayfly and many other insect species are not found. Most fish eggs will not hatch.

5.0-5.5

Bottom-dwelling decomposing bacteria begin to die off. Leaf litter and dead plant and animal materials begin to accumulate. Plankton begin to disappear.

6.0-6.5

Freshwater shrimp are not present.

6.5-8.5

Optimal for most organisms.


8.5-9.0

Unlikely to be harmful to fish, but indirect effects from chemical changes in the water may occur.

9.0-10.5

Harmful to perch and salmonids if prolonged exposure.

10.5-11.0

Prolonged exposure is lethal to carp and perch.

11.0-11.5

Lethal to all species of fish.

This information is taken in part from the LaMotte Company's, The Monitor's Handbook, 1992.



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