Fishing is one of man's oldest occupations and a big industry worldwide. Fish is an excellent and irreplaceable source of animal protein. It is believed that fish supplies about 10% of the world's protein either directly or indirectly. Based on the research and debate presented in this paper, it is clear that the increased mechanisation of fishing vessels has far-reaching occupational consequences. This research examines the effects of mechanised fishing on several fronts, including the level of investment required, professional growth, and the efficiency with which technology is used. The investigation shows that the transition to mechanised boats and motorised vessels has led to a massive increase in the size of the fishermen's investments. The transition to motorised boats and vessels has affected several facets of fishing operations, including total fishing distance, fishing days, employment, fish catch, operating costs, and operating profit. The capital intensity in the industry has risen as fishermen have shifted to using motorised boats and other machinery. However, fishing in Thoothukudi District still requires much manual labour. The transition to motorised vessels and machinery has affected fishing's numerous facets of professionalism. It has also hampered the technical efficacy of operating a motorised craft and mechanised boats in the Thoothukudi area.

Keywords: mechanisation of fishing crafts, foreign exchange, job opportunities, export market, technical efficiency