Marine capture fishing is one of the important sectors in fisheries but at present, this sector face a lot of problems such as the lack of sustainable fishing practices. In this regard, present study deals with gill net, an ecofriendly fishing gear used by three types of fishing craft sectors namely Single Day (SD) Motorised and Multiday (MD) motorised, and MD mechanized for marine capture fishing in the Tharuvaikulam coast. For judicious exploitation of resources and for formulating proper fishery policies, it is imperative to study the comparative economics of types of fishing units engaged in fishing. The efficiency of inputs and the profitability ratio among the three fishing craft sectors were estimated by using appropriate statistical tools in order to find out the effective and economically viable fishing craft methods among these sectors. The present study explains that gillnet fishing by all craft sectors in the study area were sustainable and economically viable method but, while comparing other two sectors, MD motorized sector was more profitable. Encouraging this fishing method will help to maintain sustainable level of fishery resources.