Fishing at sea in Vietnam is a quit different sight than most of us are used to. The fishermen make there boats like we in the west did at the time of Julius Ceasar. In these round primitive vessels, wich look more like baskets, is only room for 2 men and a fiching-net.
These boats are made of twigs & branches and to make them waterproof they use animal skin and resin.
The old Romans and the Celts already followed this procedure and Julius Ceasar used it in war time.