Why is a piece of worm such a reliable perch bait — do perch eat worms and leeches naturally?

They do. Aquatic worms and leeches are part of the same bottom graze as midge larvae, scuds and snails — soft, slow invertebrates picked off mud, weed stems and shells — so a bit of worm is not a trick, it is the daily menu in a size that passes the perch's peck-and-taste test. The same habit explains the other traditional baits: a perch noses along the bottom sampling anything edible, dead things included, which is why minnow heads, strips of fish and (where legal) perch eyes have filled buckets for generations. Keep the bait small — a 2–3 cm (about 1 in) piece out-fishes a whole nightcrawler, because a small mouth pecking at a long worm just steals the tail. Bait rules differ by jurisdiction; check before using fish parts.

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