Absolutely correct Joey. However, in the example I gave I threw half of the water away and REPLACED IT with mud. The total volume stayed the same. For discussion purposes, say a fish pulls 1 GPM of fluid across its gills. Assuming mud does not contain DO, then a gallon of "pure" water has twice the TOTAL DO than that contained in a gallon of a mixture of half water and half suspended mud. Only 1/2 the gallon contains DO (water) so the fish's gills are exposed to half as much DO as a gallon of fluid is pulled across the gills even though the water that is in the mix has the same DO level as the original water.

Clear as mud!

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