Gromphadorhina portentosa
Gromphadorhina • Blaberidae
The classic pet roach — large, slow, docile, and handleable, which makes hissers a popular first invertebrate and a school/education favorite. Keep a colony warm (75-90 F) with coco-fiber substrate and plenty of stacked egg-crate or cork hides. They are OMNIVORES: dry roach chow or grain-based feed plus fresh vegetables and fruit, with a protein source occasionally; hydrate with water crystals rather than an open dish. IMPORTANT: hissers climb smooth glass and plastic easily — use a tight lid, and a band of petroleum jelly around the rim is the standard escape-proofing. They are harmless: no bite, no venom. The trademark hiss is made by forcing air through abdominal spiracles, used in courtship and when disturbed. Females are ovoviviparous (carry eggs internally, give live birth to nymphs).
Temperature
75-90°F
Humidity
60-70%
Prey size: n/a (omnivore)
Type
terrestrial
Adult Size
2-3 inches
Growth Rate
medium
Native Region
Madagascar
Temperament
docile, handleable
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