earthworms
Posted by jonathan viernes on December 4, 2005
Q: Does red light have an effect to earthworms? Does red light affects their growth or their reproduction?
A: Although earthworms do not have eyes, they are sensitive to light and usually avoid it if possible. However, they are not sensitive to red light. So, if you remove all of the other colors from light (light has all of the colors of the rainbow) and just keep red, earthworms are totally unaware of its presence. Fishermen who collect nightcrawlers at night to use as bait often will use a red light to help them find and collect worms. If you use a regular flashlight, when a worm senses the light, it immediately crawls back into its burrow. If however, you use a red light (you can put red cellophane over the light), the worm isn't alarmed by the light and you have time to grab it before it retreats. The red light doesn't affect their growth or their reproduction in any way, it just isn't a wave length that they can sense. I hope this helps you out.
John Wiessinger ( December 4, 2005)