Superworm Care & Storage
Superworms (Zophobas morio) are darkling beetle larvae commonly kept as live feeders for reptiles, amphibians and other insectivorous animals.
Despite their appearance, superworms are not simply oversized mealworms. Their storage requirements are different — most importantly, superworms should not be refrigerated.
When your superworms arrive
Open the shipping container and check your superworms shortly after delivery. Providing adequate ventilation and appropriate food and moisture helps keep them in good condition during storage.
Transfer them to a suitable ventilated container if you will be keeping them for an extended period.
Do not refrigerate superworms
Superworms should not be stored in the refrigerator.
Unlike mealworms, which are commonly kept cool to slow their development, superworms are generally maintained at normal room/rearing temperatures.
Published research commonly maintains Zophobas morio larvae around 25°C / 77°F; one recent rearing study used 25 ± 2°C.
For RFI customers, follow the care instructions supplied with your order rather than treating superworms like refrigerated mealworms.
Housing
Keep superworms in a smooth-sided, well-ventilated container with enough surface area to prevent excessive crowding.
A dry grain-based bedding or appropriate feeder substrate can provide both habitat and food. Keep the enclosure dry and remove spoiled food, dead insects and excessive waste as needed.
Temperature & storage
Keep superworms at a stable room temperature away from direct sunlight, excessive heat and cold.
Superworms are generally kept together rather than separated. Stocking density can influence growth, survival and even nutrient composition, which is another reason good husbandry matters.
Food & moisture
Provide an appropriate dry feeder diet along with a source of moisture.
Fresh vegetables or other suitable moisture-rich foods can provide hydration, but don't allow wet food to remain long enough to mold or spoil.
Diet matters beyond simply keeping the insects alive. Research shows that feed formulation, feeding rate and plant-based supplemental foods can influence superworm growth, survival and development.
Why an isolated superworm may pupate
Superworms have an unusual developmental characteristic.
Isolation can trigger pupation in mature superworm larvae.
So if a large superworm becomes separated from the colony and eventually curls up and begins changing form, that isn't necessarily a sign that something went wrong — it can be part of the insect's normal developmental biology.
Handling
Superworms are larger and more robust than ordinary mealworms and have noticeable mandibles.
Handle them carefully and avoid unnecessary squeezing or rough handling. Feeding tongs can be useful when transferring individual insects.
Before feeding
Choose a feeder appropriately sized for the animal being fed and inspect feeders before offering them.
Superworms are relatively energy-dense compared with mealworms, so consider them as part of the animal's overall feeder variety and supplementation program rather than evaluating them solely by their protein content.
Sources
Khan SZ, Usman A, Khan K, et al. (2024). Effect of stocking density on performance, survival and nutrient composition of super worm Zophobas morio (Coleoptera: Tenebrionidae). Tropical Animal Health and Production 56:95. DOI: 10.1007/s11250-024-03935-x. Rearing conditions in this study were 25 ± 2°C and 70% relative humidity.
Optimization of Feed Formulation, Feeding Rate, and Plant-Based Supplements for Efficient Rearing of the Superworm Zophobas morio (Fabricius) Under Tropical Conditions (2026). Insects 17(2):138. DOI: 10.3390/insects17020138.
Explore: Superworm Nutrition · Feeder Size Guide · Gut Loading
Feeding & care disclaimer: Care requirements and appropriate feeding practices vary by species, age, size and individual animal. The information provided here is general husbandry guidance and is not a substitute for species-specific veterinary or professional care.