This guide briefly summarizes development and structure of the sportfishery comprehensive management system model RIOFISH, and describes its use. Following introductory background, the guide is designed to be read as the model is run and should be accompanied by diskettes for IBM compatibel desk-top computers. The model user is stepped through menus that access background information, scenario set-up process (user modification of model inputs), model running process, and retrieval of model results. Each of the numerous input and output options is described. Example model runs illustrate how reference-scenario runs are compared to user-modified scenarios to estimate incremental changes in management outcomes associated with management actions. The various model uses are described, with emphasis on comprehensive management planning. Please send model-related comments or queries to Richard Cole, Box 30003, Dept. 4901, NMSU, Las Cruces, NM 88003 (505/646-1346) or rcole@nmsu.edu