"Fishing Machine" was indeed a model of boat made by Cajun (Mastercrafters Inc.). The convention used was:
Cajun Fishing Machine 185 D - Where "185" was the usual size code, so it could be 176 for example, or whatever the length is, and "D" indicates some trim or feature level (I've seen "S" models as well). I'm not sure what the letters mean or if they were always used.
Mastercrafters went OOB in 2002, but the parent company lives on (Genmar)