Floating bamboo bundles and piles of stones
kept on the sea bottom have long been used by
traditional fishermen as fish gathering devices in
various parts of the world. These objects provide
living space, shelter for protection from the
predators thus functioning as (i) a habitat for
organisms. The attached algae and other sessile
organisms serve as food especially for young
ones. Thus the area where such objects are placed
function as (ii) a feeding ground. These objects
also act as a suitable substratum for attachment
of eggs in some cases thus functioning as (iii) a
spawning ground. Based on these principles
artificial reefs are constructed in different parts
of the world either to create a new fishing ground
or to improve the production potential of the
existing grounds