Macroinvertebrates

Macroinvertebrates
animals without backbones of a size large enough to be seen by the unaided eye and which can be retained by a U.S. Standard No. 30 sieve (28 meshes per inch, 0.595 mm openings).
Metric ...

Macroinvertebrates: Bottom-dwelling insects found under rocks in creekbeds.
Meander: The tendency of moving water to form S-shaped curves (meanders).

macroinvertebrates aquatic invertebrate organisms large enough to be seen with the naked eye. They either live within or upon the substrate, although some forms may be free-floating.

Examples of assemblages used for biological assessments include : algae, amphibians, birds, fish, herps (reptiles and amphibians), macroinvertebrates (insects, crayfish, clams, snails, etc.), and vascular plants.

See also: Pollutant, Table, Population, Condition, Lakes