Breeding/Rearing of Prosopocoilus giraffa keisukei (page
- Yasuhiko Kasahara
3.2 Rearing larvae
After a couple of months, take the female
out of the container.* Then, carefully break down the log(s) to see if
larvae have already hatched inside. If so, transfer them singly into plastic/glass
bottles of about an 800 cc (0.8 liter) capacity, which is filled with substrate
(see 4. A substrate for rearing Lucanid beetles). When you
stuff substrate into empty bottles, the substrate should be pressed hard.
Some female larvae may undergo emergence in the first bottles without the
substrate changed. Meanwhile, male larvae have a greater appetite and take
a longer time before their emergence. When the substrate in the first bottles
is almost eaten up, you need to transfer them singly into the second bottles.
For females, use bottles of the same dimensions, but for males, you need
to transfer them to larger bottles (e.g. 1,500 cc (1.5 liter) with a diameter
of at least 15 cm). Repeat this process, if need be.
* If you wish to obtain
more eggs, place the female into another breeding container.
this process if you want.
Eggs in cups are to be maintained for about one month
An example of a 1,500 cc (1.5 liter) glass bottle, which is filled with
When changing substrates, it is safer to
stuff unused (new) substrate first from the bottom of the bottle, and then
the used one. The capacity ratio of the new to the used is 2-to-1. By so
doing, beetle's symbiotic bacteria, if any, would grow steadily in the
substrate and promote an ideal feeding environment for better larval growth10.
From the author's rearing, the duration of larval periods are: Male: 9
or more months; and Female: 4-9 months.
3.3 Larva sexing
For sexing, see the following picture,
Yellowish ovaries may be visible underneath the 7-8th abdominal segment
of the dorsal side of a female larva after its mid-L2 stage. There are
no ovaries in a male larva, as a matter of course. Besides, an L3 male
reaches 40-60 grams in weight when it is fully grown, whereas the female
remains below 20 grams.
3.4 Maintaining pupae
After larvae turn noticeably yellowish
in colour, stop changing substrates. Some time soon, the larvae will make
pupal cells and undergo pupation in them. Often times, you can see pupae
through the (transparent) bottle wall against which their pupal cells are
made. The best advice I can give you at this point is patience: wait until
one month after their emergence, and then take them out carefully. Newly
emerged adults need 3-4 months for maturity. The life span of the adult
is 10-12 months after its emergence.
Repeat the process: 3.1 Getting
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