The advantages
- damage to navigation. Can the shallow water zone without need a buoy position
.- don't break the fishing tools, such as the nets or hinder the fishery. Because the shell is small and lightweight
-. Don't affect the environment in the sea
. Cons- shell is small and lightweight. When a current was moderate to severe makes shells scattered and piled up easily. Especially the sea floor were sand or mud
.Some species, such as - shell clam or oyster is what cannot be found in general, need to have purchasing
-. The construction of artificial reefs, each using a shell volume. And time-consuming to collect shells
.- structure of the artificial reef is complicated. To attract fish to come to live a little!
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