Beetle & Stag Beetle Breeding Guide

Basics of Beetle and Stag Beetle Breeding

Breeding rhinoceros beetles and stag beetles is one of the great joys of insect keeping. With different species requiring different approaches—from egg-laying substrates to larval rearing methods—understanding the basics is essential for successful breeding.

Rhinoceros Beetle Breeding

Creating an Egg-Laying Setup

1. Fill a large breeding case (L size or bigger) with fermented substrate (mat) to about 15cm deep, packing it firmly
2. Add loose substrate on top and place jelly, bark, and climbing branches
3. Introduce the female (mate with a male for at least 1 week beforehand)

Extracting Eggs and Larvae

• Timing: 1 to 1.5 months after setting up
• Method: Carefully break apart the substrate to collect eggs and larvae
• Caution: Eggs are extremely fragile—handle with a spoon

Stag Beetle Breeding

Egg-Laying Setups by Species Type

Wood-Laying Species (Japanese Giant Stag Beetle, Small Stag Beetle, etc.) 1. Soak egg-laying logs in water for 6–12 hours 2. Peel off the bark 3. Half-bury the logs in fine-particle substrate

Substrate-Laying Species (Rainbow Stag Beetle, Flat Stag Beetle, etc.) 1. Pack fine fermented substrate firmly into the case 2. Egg-laying logs can be added as a supplement (optional)

Fungus-Bed Laying Species (Japanese Giant Stag Beetle, etc.) 1. Use Kawara fungus bottles or Kawara wood 2. This method yields a high egg-laying success rate

Extracting Larvae

• Timing: 1.5 to 2 months after setting up
• Method: Carefully split the egg-laying logs to collect larvae
• Caution: First-instar larvae are tiny—watch for missed ones

Larval Care

Substrate Rearing

• Rhinoceros Beetle: Raise in fermented substrate. Replace substrate every 2–3 months
• Stag Beetle: Use fine to coarse substrate depending on the species
• Cost: Inexpensive, but growth is slower

Fungus Bottle Rearing (Stag Beetles)

• Advantage: Higher chance of producing large specimens
• Types: Ohiratake fungus, Kawara fungus, etc.
• Replacement Timing: Replace when feeding marks cover 70% or more
• Temperature: 20–25°C is ideal

Pupation and Eclosion

• Pre-pupa: When the larva shrinks and turns yellowish, it's in the pre-pupal stage. Do not disturb
• Pupal Chamber: The pupa creates a chamber. Be careful not to break it
• Eclosion: Occurs 3–4 weeks after pupation
• First Feeding: Adults begin eating 1–3 months after eclosion (varies by species)

Breeding Precautions

• Temperature Management: Maintain species-appropriate temperatures (especially important for exotic species)
• Inbreeding Records: Track generation numbers (F1, F2...) for inbreeding management
• No Outdoor Release of Exotic Species: Never release non-native species into the wild
• Regulated Species: Some species have legal restrictions on keeping—always verify

Benefits of Buying on Buri-Choku

On Buri-Choku, you can purchase insects with detailed lineage information directly from breeders. Origin data, bloodline details, and temperature management advice are all available, making it ideal for breeding enthusiasts.