Contact us
  • Facebook Social Icon
  • Twitter Social Icon
Like What We Do Here?

Help us continue to operate!

Jul 19

Variables For Mealworm Size?


I've been raising mealworms for 8 or 9 months now and have noticed my pupae getting smaller and smaller. I thought moisture might be a problem so a month or two ago I started feeding vegetables more often, every couple days. I also tried adding a sponge in an open ziploc bag to the bins to try to increase humidity. A gauge laying on the substrate shows about 80 degrees F and 60-65% humidity in the beetle bin, nearly 90 degrees F and about 55% humidity in the worm bins.

I feed a variety of produce I grow myself including carrots, potatoes, string beans, beets, yellow squash, banana peppers. Still my pupae are coming out very tiny. Since the large pupae are starting to show up less often and my larger beetles are getting pretty thin in numbers, I'm desperate to get the problem fixed. I want to maintain them organically raised, so I don't want to use chemicals on them, I was thinking about pulling out the larger beetles and larger pupae to start a new bin. I don't know if selective breeding will fix the problem. I wonder if genetic diversity is a problem, maybe the population per bin is too dense? Anyone have any suggestions?

Space Coast Mealworms
Jul 19

what substrate are you using?

Jul 19

Wheat bran

Space Coast Mealworms
Jul 19

Hm.. Have you considered adding a variety of grains, such as chick starter or spent brewery grains? I've recently added chick starter to my bins and have seen a difference in size (I have two trays for each week of eggs I've produced, and have only added the chick feed to one of the two trays for each week, which is how I'm able to note a size difference). This article explains the benefits of doing this, but in short, a variety of grains lead to larger worms. The entire article is a good read though. Lots of tips!


Otherwise, your farm conditions seem pretty standard. Selective breeding is also beneficial, but quite time-consuming to say the least.. Max, over at Max-a-mealies, has the biggest worms I've ever seen and he says it's from selective breeding and setting up a temperature routine (raising temps and lowering temps for a specific amount of time).

Jul 19

Awesome thanks. I'll give that a read, try some diverse substrate. I appreciate it.

New Posts
  • jking
    Jul 18

    I watched some videos of Space Coast Mealworm. Is it ok to feed carrots for moisture once everyday of evenings or do they need moisture 24/7 in box. I have 7000 total in 2 different boxes. Just a rookie starting out here
  • itsmerickb
    Apr 26

    I would like to connect with like minded individuals who are running large Mealworm farms. Basic information needed for set up and inventory amounts along with tools, process etc... I'm an online marketing individual with a partner who creates websites and earns income online through marketing. Creating websites for meal worms is super easy. But learning the process I need to be able to sell Mealworms and raise them appears to be much more difficult. There does not seem to be a one site fits all for Mealworm farming. The larger farms do not seem interested in sharing their knowledge, if you can ever find one. And the small growers who breed for their pets are just too undersized for giving out the correct information for large growth set ups. Max-Mealies has a large set up however he does not answer my questions. So looking for a company that is willing to share their info about mealworm farming with ME, a retired truck driver wanting to suppliment his income by way of Mealworm farming and the Internet. Thanks so much. Rick I've also offered payment for shared information I can utilize. And willing to fly to any state to take a tour or learn from individuals who have a large set up.
  • n.buffoni
    Apr 21
This site was designed with the
website builder. Create your website today.
Start Now