Catfish is one of the leading commodity. Business development can be started from
seed to the size of consumption. Each segment of the business is very profitable. In addition
to local consumption, the market has started to export catfish and demand is quite large.
But in cultivation activities often uncul constraints. One is pest and disease catfish. To help
the effort so that the issue can be resolved at an early stage, then made an expert system
based on information technology to make the diagnosis of diseases in catfish using
backward chaining inference logic used for the consultation process. Results of applications
that have been made close to the results of an expert's diagnosis made catfish disease.