Many programs use coarser mesh than is recommended in this manual. Coarser mesh is generally less expensive. However, smaller organisms can be lost throguh the mesh during sampling. If you are in doubt as to what mesh size to use, consult your technical a dvisor. Surber Sampler Used by professional monitoring programs, this sampler delineates an exact stream bottom area to be disturbed.
Nets used by professionals and volunteers vary in overall size, design, and mesh size.