Time line analysis on change in fishing practices of traditional sector before and after 80’s revealed that prior to motorization (before 80’s), the entire coast of Kerala was classified into three major craft zones based on fishing craft prevailed, such as catamaran zone (Kollamkode to Sakthikulnagara), plank built zone (Neendakara to Thrissur) and dugout canoe zone (Malappuram to Kasargod).
https://www.icsf.net/wp-content/uploads/2015/09/930.ICSF019.pdf