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.

Noun

edge of land along the sea or other large body of water.

Noun

steady, predictable flow of fluid within a larger body of that fluid.

high tide
Noun

water level that has risen as a result of the moon's gravitational pull on the Earth.

Noun

region between the high and low tide of an area.

low tide
Noun

water level that has dropped as a result of the moon's gravitational pull on the Earth.

Noun

division of a country larger than a town or county.

recede
Verb

to retreat or withdraw.

Tla'amin
Noun

people and culture native to the coast of southwestern Canada.