Two notable ways than setting fishing limits can help protect fish species:
Preservation of fish - this prevents extinction, and at the same time helps other species of fish catch their prey. Thus, making the food chain stable.
Preserves the nature of underwater - fishes tend to take care of their underwater world, and preserving them helps maintain the appearance under the oceans and sea.

LOWA is the state which is bordered by the Mississippi River on the east , the Missouri River and the Big Sioux River on the western side .
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Try D. Tectonic plates are pushed apart partly due to convention currents