How to Raise Stag Beetle Larvae | Basics of Fungal Media and Mat Cultivation

Stag beetle larva cultivation is one of the most rewarding fields in insect keeping. The choice of fungal media or mat, along with temperature management, can significantly change the size of the resulting adult, making it possible to aim for raising large individuals through careful planning. This article explains the basics of raising stag beetle larvae for beginners. For adult care of rhinoceros beetles and stag beetles, please also refer to Introduction to Insect Keeping.

Differences Between Fungal Media and Mat Cultivation

There are two main methods for raising stag beetle larvae.

Fungal Media Cultivation

• Advantages: Larvae grow quickly and larger individuals are more likely to develop
• Disadvantages: Higher cost (600–1,800 yen per bottle). Risk of re-colonization and mold if degraded
• Suitable for: Large stag beetles, flattened stag beetles, saw stag beetles, rainbow stag beetles, etc.

Mat Cultivation

• Advantages: Lower cost. Easy to manage and beginner-friendly
• Disadvantages: Growth is slower and large individuals are less likely to develop compared to fungal media
• Suitable for: Can be used generally, but especially for rhinoceros beetle larvae, mat cultivation is the standard

Fungal media is recommended if aiming for large individuals, while mat cultivation is recommended for those wanting to keep costs down and enjoy it more casually.

Choosing Fungal Media Bottles

There are several types of fungal media bottles, and you need to choose according to the species you are raising.

• King Oyster Mushroom Medium: The most common type. Compatible with a wide range of species including large stag beetles, flattened stag beetles, and saw stag beetles