Swampy areas generally provide shelter from their natural predators and do not freeze on the bottom, providing an ideal underwater climate for crawfish. Crawfish also love to eat soft, decaying plant matter which swamps normally have in spades.
Crayfish require an optimum amount of dissolved oxygen in the water and a temperate water temperature to survive in an area. Swampy areas offer both of these things. But, even more importantly, swamps have the cover needed to hide crayfish from predators and the food supply that can sustain a population of crayfish.
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