To catch more fish, the Tla'amin people (native to what is now the Canadian province of British Columbia), set traps in the intertidal zone. The intertidal zone is a coastal area that is underwater during high tide, but exposed to the air during low tide. Tla'amin traps were made of collections of stones or other material. When the tide came in, fish entered the traps with natural tidal currents, swimming over or around the traps' low stone "wall." When the tide receded, these walls prevented the fish from swimming out. Trapped fish were easily harvested from these shallow tidal pools.
edge of land along the sea or other large body of water.
steady, predictable flow of fluid within a larger body of that fluid.
water level that has risen as a result of the moon's gravitational pull on the Earth.
region between the high and low tide of an area.
water level that has dropped as a result of the moon's gravitational pull on the Earth.
division of a country larger than a town or county.
to retreat or withdraw.
people and culture native to the coast of southwestern Canada.