A detailed steady-state model of the trophic interactions and organic matter transfer in a Caribbean coral reef is presented, based mainly on published data on fishes and invertebrates sampled in the Virgin Islands. System parameters and mixed trophic impacts were calculated with the ECOPATH II program. This preliminary version of the model consists of 21 boxes with 9 fish species group and 11 nonfish groups which include primary producers and detritus. The balance model indicates that a thermodynamically feasible model of a coral reef can be constructed from published data and parameter calculations derived from multivariate statistics.