a measure of salts dissolved in a solution; the sea is 3.5% (35 parts of salts by weight per thousand parts of water, or 35,000 p.p.m.). Fresh water is <1000 p.p.m., slightly saline is 1000 - 3000 p.p.m., moderately saline is 3000 - 10,000 p.p.m., very saline is 10,000 - 35,000 p.p.m., brine is >35,000 p.p.m. and is water saturated or nearly so with salt. Inland waters are 0.5 -2.0 or less p.p.t. (sources vary), brackish waters are 0.5 to 2.0 - 17.0 p.p.t. and marine waters are on average 35 p.p.t. Note that there are saline inland waters which have higher salinity values than marine waters

Dictionary of ichthyology. 2009.

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