turbid \TUR-bid\, adjective:

1. Muddy; thick with or as if with roiled sediment; not clear; -- used of liquids of any kind.
2. Thick; dense; dark; -- used of clouds, air, fog, smoke, etc.
3. Disturbed; confused; disordered.

Although both are found in the same waters, black crappies usually prefer clearer, quieter water, while white crappies flourish in warmer, siltier and more turbid water.
-- Tim Eisele, "Crappie Facts", Capital Times (Madison, Wisconsin), May 8, 1998