High Yellow Giant Isopods For Sale UK (Porcellio haasi) - Giant Spanish Culture
Looking for a true giant of the isopod world, the largest in our whole collection with unmatched coloration? The Porcellio haasi "High Yellow" is a spectacular Spanish species, prized for its large, elongated body and vibrant lemon-yellow spotting against a dark, charcoal-grey exoskeleton. As one of the largest species in the Porcellio genus, they are famous for their long uropods (tails) and their bold, inquisitive personalities.
🔍 At A Glance: Porcellio haasi Isopod Husbandry Summary
Scientific Name: Porcellio haasi (High Yellow Morph)
Common Names: High Yellow Isopods | Spanish Giant Isopods | Haasi High Yellow
Adult Size & Lifespan: Impressive 3.0–3.5cm "giant" status | Adults live for approximately 2 years.
Breeding & Growth Rate: Highly prolific breeders once successfully acclimated and established.
Ideal Climate: Temperature: 20–23°C (Kept at 21–23°C The EntoScapes Way) | Humidity: 50–55% (A strict Mediterranean "Humidity Paradox" species that requires an extremely dry environment paired with excellent ventilation, but must have a localized moisture gradient).
Physical Identification & Behaviour: Bold, inquisitive, and highly active surface-display personalities. Features a massive, elongated charcoal-grey exoskeleton heavily contrasted by vibrant, lemon-yellow spotting and light grey/white skirting. Strongly sexually dimorphic; adult males develop exceptionally long, imposing tail appendages (uropods).
Place of Origin: Dry, rocky, mountainous regions of Spain (specifically native to Aragon).
Enclosure Sizing Guide: Because they are a massive species that requires significant territory to prevent male competition, a starter colony of 10–15 individuals requires a minimum 20x15x15cm setup with full lid ventilation. Expanding master colonies scale cleanly into a larger 40x20x20cm tub with widespread lid ventilation.
Diet & Substrate Enrichment: Requires a deep 5–10cm layer of high-quality organic material (such as Premium Millipede Edible Substrate; never use coco coir) packed with decayed hardwood leaf litter and rotting wood. To survive the humidity paradox, provide plenty of curved bark shelters on the dry side to let them escape ambient dampness.
Supplemental Nutrition: Calcium-hungry giants that require a constant source of supplemental calcium (cuttlebone, crushed sepia, or eggshells) at all times to avoid exoskeleton issues. Supplement weekly with high-quality protein (fish flakes, shrimp pellets, or dried mealworms) alongside fresh vegetables like cucumber slices. (Important Note: Absolutely do not house with moulting millipedes due to their protein-hungry tendencies).
At EntoScapes, our High Yellows are UK captive-bred and raised on our specialist high-calcium, well-ventilated systems to ensure they arrive robust and healthy.
Explore the sections below for our biology-led guide on the Mediterranean climate requirements, vertical climbing space, and the specific ventilation needs of these stunning Spanish giants.
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