Underwater acoustic sensor network (UASN) marks a new era in ocean exploration, enabling various scientific, military and commercial applications. This paper describes one of the scientific applications named coral reef monitoring in a desired region of interest in the Arabian Sea. The events of coral bleaching that leads to massive destruction of coral reef is a current alarm faced by most of the buildups. UASN can be deployed to monitor the environmental parameters of various such regions. In this paper, a number of nodes are deployed in the form of clusters at various regions. An autonomous underwater vehicle (AUV) is used to collect data by visiting the clusters/cluster-heads periodically. Travelling salesman problem (TSP) is used to find optimum tour for the AUV in the data collection phase. The application of TSP in data gathering helps the data collection by forming minimal tour for the vehicle. This paper provides the implementation of protocol stack along with detailed results and analysis using an underwater network simulator (UnetSim).