Researchers have estimated that the potential life-span of earthworms (Lumbricids) under field conditions is 4-8 years. Under laboratory conditions the black headed worm (Aporrectodea longa) has been kept for over 10 years, the brandling/tiger worm (Eisenia fetida) for 4.5 years and the lobworm/nightcrawler (Lumbricus terrestris) for 6 years (Korschelt, 1914). But for commercial purpose we consider only the life cycle i.e., the period of time taken for hatching egg to adult stage. It varies depending upon the species from 45 to 75 days.
P. Mahendran
UPASI Tea Research Foundation,
Regional centre, Coonoor,
The Nilgiris. Tamil Nadu.
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