• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar

Dubia Roach Depot logo

  • HomeStart here
  • ShopLive Dubia roaches and supplies
    • Dubia Roaches
    • Live Cleaner Crews
    • Supplies
    • Food & Water
    • Other Roach Species
  • Guidance & Information Expert Dubia roach information and advice
  • Our GuaranteesLive Arrival, same-day shipping, complete satisfaction, and more
  • Sign InLog in for order status, tracking, easy reorder, and more
  • CART
    0 items - $0.00

Home > Guidance & Information > Dubia Roach Growth Rate: Measuring Results

Dubia Roach Growth Rate: Measuring Results

Last Updated July 15, 2019 7 Tags: breeding, colony, growth

Dubia Roach Growth Rate: Measuring Results

Dubia roach growth is predictable, and you can use this to your advantage. Knowing their growth rate can help prospective home breeders plan ahead and set reasonable expectations for their colony’s future. Because Dubia roach growth depends on environmental conditions, knowing how fast (or slow) they should be growing can also help you fine-tune their current environment as well as identify and solve nutritional, general health, and other issues as they arise rather than going weeks or months without even knowing a problem existed.

In short: knowing what’s normal allows you to track their progress and address potential issues before they linger too long and turn into real problems with real consequences.

Knowing and understanding the basics

Dubia roaches have seven growth phases between molts called instars hard-wired into their physiology. While the number seven is fixed, environmental conditions can affect instar length. This kind of variation is common, even “normal”. However, at some point inadequate conditions can vary the number of instars. Rather than normal variation, this variation leads to poor roach health, slowing growth, and reduced productivity.

However, a change in the number of instars due to seriously inadequate conditions is not typical in well-maintained captive Dubia roach colonies. The conditions really need to be extreme for them to change. Some of the factors that may increase the rate at which Dubia roaches complete instars (external link) or increase the number of instars if they are extreme enough are low temperatures, poor diet, starvation, low humidity, injury, and an increase in daylight hours.

Using expectations to find problems

Conversely, when starting from a position of inadequacy, improving these things can increase the rate of growth. This is of particular importance to Dubia breeders, and is the point of this post.

A dip in growth signals less than ideal conditions. It means something is wrong and needs improvement. This knowledge can help you maximize the growth of a Dubia colony and head off many of the problems reported by roachkeepers.

Of course, more is not always better. There are natural limits beyond which providing more of something has no effect, and may even have adverse effects. Temperature is one example. Moisture is another. This is particularly with captive colonies.

Instar completion in weeks

The following are the average number of weeks Dubia roaches take to complete their seven instars. This is based on our experience with colony temperatures between 80ºF & 90ºF.

Average time to complete instar. (instar number: weeks)

1: 3
2: 5
3: 7
4: 10
5: 13
6: 15
7: 20

This means Dubia roaches go from birth to adulthood in about five months. We can round days to weeks because there is significant variation among roaches. This is true even with roaches reared together in the same conditions. In fact, individual variation of the time from birth to completion of the final instar can vary as much as two weeks.

Unlike instars, the rate Dubia roach body size and weight increase over time are difficult to predict. We could assign a range of sizes and weights, they are so varied that this would be practically useless. There’s just too much variation. Many factors affect Dubia roach size and weight, including hydration, reproductive status, growth cycle, and the quality and amount of food consumed. Some of these have very little or no relation to the actual Dubia roach growth rate. They may also vary weekly, and sometimes even daily. A hungry roach can double its weight with food alone, so weight is a poor measure of progress.

Having said this, there is a size-related measure of Dubia roach growth that is relatively constant and predictable. However, it has little practical application for feeders or breeders. It involves measuring the width and length of the roach’s head at the beginning of each instar, then plotting changes over time. For Dubia roaches, this growth rate is a constant 1.25, which means each instar is marked by a 125% increase. Incidentally, this rate is standard across many insect species.

Read more: Deep dive into Dubia roach breeding »

Conclusion…

Understanding expected Dubia roach growth rates, how to measure them, and how to use this data to troubleshoot in case there’s a diversion from the expected norm can be a significant help Dubia roachkeepers in their breeding projects. The greatest advantage is that when implemented correctly, tracking actual and expected growth can not only help maximize productivity and reproductive efficiency but potentially even alert to problems early enough that any lasting negative consequences can be entirely avoided.

Share | Email | Print

Likefacebook (like)TweetTwitterSharefacebook (share)PinPinterestStumbleUponMixEmailemailPrintprint

Reader Interactions

Comments

  1. Nancy Farlow says

    July 8, 2015 at 9:23 am

    I’m confused about the instar periods for each growth stage. Your text says that Dubia roaches go from birth to adulthood in about 5 months, which sounds about right to me. But if you add up the weeks listed for each instar stage, it totals 73, which is about a year and a half. Can you clarify this for me? Thank you.

    Reply to Nancy
    • Synaesthesia says

      September 9, 2015 at 1:39 pm

      I don’t think you are supposed to add them up. The “week number” should represent the age of the roach – the time that has passed since the roach was born, not since the last shedding.

      Reply to Synaesthesia
    • Andrew C. says

      October 7, 2015 at 1:33 pm

      The comment above is correct. The week number is total time from birth to instar completion and not the time spent in each phase.

      Reply to Andrew
  2. Adam Morrell says

    December 10, 2017 at 8:56 pm

    What instar stage would you consider the average medium feeder?

    Reply to Adam
    • DRD says

      December 12, 2017 at 7:33 pm

      Very generally, “average” is probably in the 4th or 5th instar, so that puts it in the 2.5 to 3 month range.

      Reply to DRD
  3. Jordan says

    June 30, 2018 at 10:02 am

    I’ve had my colony for a while now, but I’ve only seen Dubias that have gotten up to the 5th or 6th instar and 60-70 of the 200 something adults that I have died. Should I be getting worried at this point or give them more time to grow to the adult stage? I was thinking about buying some more adults so they didn’t die off completely since they’re kind of old now.

    Reply to Jordan
    • DRD says

      July 2, 2018 at 1:32 am

      Most of your Dubia should reach adulthood. If 30% are not, there is a problem. The possibilities are many, but you may want to generally consider things like diet, temperature, and humidity. Our article about breeding breed Dubia roaches can provide more in-depth information that might help you diagnose and resolve whatever issue might be happening.

      Reply to DRD

Ask a Question or Leave a Comment Cancel reply

Required fields marked with *. Email will not be published.

Primary Sidebar

Like & Share

Share | Email | Print

Likefacebook (like)TweetTwitterSharefacebook (share)PinPinterestStumbleUponMixEmailemailPrintprint

Related Posts

  1. Roach Growth and Population Density
  2. How Many Dubia Roaches Are Needed to Start a Colony?
  3. How to Choose the Right Size Dubia Roaches
  4. Troubleshooting Dubia Roach Breeding Problems
  5. Should I Use Dermestid Beetles in My Dubia Roach Colony?

Looking to buy Dubia roaches?

When you're ready, check out our Dubia Roaches. They're the highest quality, most orders ship the same-day, and every purchase comes with our Complete Satisfaction Guarantee. Find out more about our products, services, & guarantees.
Contact Us
  • email
  • contact form
  • facebook twitter instagram pinterest

Sign Up
Site Links
  • sitemap
  • about us
  • customer testimonials
  • privacy & terms
  • mail carrier info
  • payment security and order guarantee seals
Our Service
  • same day shipping
  • free shipping
  • shipping schedule
  • live arrival guarantee
  • complete satisfaction guarantee
  • faq
Order Info
  • log in/register
  • order status
  • shipping alerts
Payment Options
We accept Visa, MasterCard, Discover, AmEx, PayPal, and Pay With Amazon
logo small

Copyright © 2013-2021 · dubiaroachdepot.com

COVID-19 Update: I apologize for the recent delay in orders over the last week. I am working my way through them now and hope to get them processed and shipped soon. Dismiss

Share this Article

Email sent!