From the article

"Fishing is often neglected in studies of urban societies. This is unfortunate as the study of fish can reveal aspects of subsistence, regional trade, access to resources, and social organization. Coastal and inland relationships can be examined by considering marine and riverine species variation. Seasonal indicators can suggest whether fishing was a fulltime or part-time activity. Material from dump and domestic contexts excavated from the inland, urban center of Harappa is used to examine these issues. Limited comparison with the contemporary coastal settlement of Balakot is also presented."

Chapter 8 of Harappa Excavation Reports 1986-1990