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[–] simone [OP] 1 points (+1|-0)

Around the US, many park districts and wildlife areas collect used or unsold Christmas trees to recycle as fish habitats. It works this way: at the end of the holidays, real Christmas trees, stripped of all their ornaments, are bundled up together and thrown in lakes to create reefs. These reefs give young fish a place to hide from larger fish, provide new nesting grounds, and also allow for the growth of algae. And that helps the ecosystem as a whole: the algae feed aquatic bugs, bugs feed little fish, and little fish feed large fish.