A trophic model of the marine fisheries resources of the north coast of Central Java, Indonesia was constructed using the Ecopath with Ecosim software and data from a trawl survey conducted in the area in 1979. The model consists of 27 ecological groups with a mean trophic level of 3.04. The exploited fishery was then a moderately mature and relatively stable system. The impact of the fishery at the time was low to moderate in comparison with the fisheries in other systems and notably in later time periods.