by Roger Young
At the lake’s edge, fish find cover among the rocks, while further out tiny zooplankton float and graze. In the river, mayfly nymphs drift downstream, only to be snapped up by a torrentfish. Freshwater habitats seethe with life, from tiny algae to 2-metre eels, and each species is vital to the ecosystem.
Main image: Toebiter stream insect
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