Also known as red wigglers, trout worms, or tiger worms. Red worms are a species of earthworm that are native to Europe. Red worms are 2-3 inches long and are used mostly for fishing bait, feeding animals, and for composting. Red worms make excellent fishing bait for panfish, catfish, trout, blue gill, crappie, and perch. Red worms have an exceptional shelf life of 3 months in the refrigerator in the containers they come in; no feeding necessary.