blowfly larva; green bottle fly larva; maggot used as bait
Specifically the larva of blowflies or green bottle flies, often used as fishing bait.
I use blowfly larvae as fishing bait.
Blowfly larvae sometimes swarm on meat.
Rare kanji form; the first character is not in common use.
The origin is uncertain. The kanji 蠁子 is rare and likely a specialized entomological or historical spelling.