Question
In a previous question, which you very kindly answered, I asked about crawdads causing our homeowner's association ponds to be muddy. It was suggested by our management company that there is a method of electric shock used by fish and wildlife that brings fish to the surface to be counted. They recover with no harm.
Would this work for the crawfish which could be harvested on the surface?

Answer
I did a seach and found that people have used electroshocking on crayfish.  Here are some links.

http://www.ncwildlife.org/pg07_wildlifeSpeciesCon/nccrayfishes/survey_results.ht...

http://www.fs.fed.us/oonf/ouachita/natural-resources/crayfish/ouachita_crayfish....

See more by searching for "electroshocking crayfish."

This site used baited traps:

http://www.wcu.edu/ub_math_science/pdf/1995/crayfish.pdf#search='electroshocking...