Green Spotted Puffer (GSP)
Dichotomyctere nigroviridis
The Freshwater Lie and The Marine Truth (6 inches / 15 cm). The GSP is the single most tragically misunderstood fish in the pet trade. Stores sell them by the thousands as 'Freshwater Puffers'. THIS IS A FATAL LIE. While babies hatch in freshwater rivers, their bodies undergo a radical biological shift as they grow. They MUST migrate to Brackish estuaries, and eventually Full Marine ocean water as adults. Keeping an adult GSP in freshwater guarantees a slow, agonizing death from kidney failure and suppressed immunity.
Température de l’eau
24 - 28 °C
Valeur du pH
7.5 - 8.5
Type d'eau
Eau douce
Niveau dans le bac
Milieu
Taille adulte
15 cm
Volume minimal du bac
>= 180 L
Groupe minimal
>= 1
GH
10 - 20 dGH
KH
5 - 10 dKH
TDS
200 - 400 ppm
Conductivité
313 - 625 uS/cm
Description de l'espèce
Geographical Origin and Habitat: Widely distributed in the coastal zones of Southeast Asia (India, Sri Lanka, Indonesia, Philippines). As a juvenile, it inhabits fresh or brackish river waters, but as it matures, it progressively migrates towards mangrove estuaries and coastal marine habitats. Therefore, it requires environmental chemical modifications during its life.
Taxonomy and Morphology: Famous "Green Spotted Puffer" (GSP). Oval, stocky body, scaleless, and provided with small retractable spines hidden under the tough skin. The powerful fused calcified beak teeth form a pincer capable of easily crushing hard oyster and crab shells. Reaches 15 cm (6 inches) in the aquarium.
Social Behavior: Extremely exploratory, curious about who is outside the glass. Interacts like a pet, learning to recognize its owner. Intraspecifically intolerant and hyper-aggressive as an adult: bites heavily both conspecifics and other fish. Preferably needs a solitary or species-specific aquarium with vast territories.
Coloration and Sexual Dimorphism: The back is fluorescent green or yellow-green studded with large circular black spots (polka dots). The belly is brilliant pure white in good health. When the fish is frightened, stressed, or in bad water, the belly darkens becoming ash gray or blackens on the sides. No evident sexual dimorphism.
Soins, reproduction et cohabitation
Aquarium Setup: Tank of 150-200 liters (40-55 gallons) per adult specimen. Layout based on stacked smooth rocks to form huge caves and numerous hiding places (often brackish mangrove roots). The biological filter must be oversized due to the enormous organic loads the fish produces while eating. No live plants unless they are tolerant marine/brackish macroalgae.
Diet and Feeding: Molluscivorous predator. Never feed it dry food! It absolutely needs raw foods with shells to file down its continuously growing teeth: pest snails, mussels, clams, whole clams split in half, krill, whole ghost shrimp, and crab pieces. Lack of hard food inexorably leads to teeth blocking its mouth.
Water Quality: The most lethal mistake is keeping it in permanent freshwater. They are born in freshwater but rapidly require a transition into BRACKISH water. An adult specimen thrives in a high salinity or pure marine aquarium (SG 1.015 - 1.022), basic alkaline pH (7.5-8.5), and very high hardness. Temperatures between 24 and 28 °C (75-82 °F).
Compatibility and Cohabitation: Serial killer of community fish. Bites to the blood (aggressive fin-nipping) any freshwater tankmate. An adult in strongly brackish water can occasionally coexist with Monos, Scats, or Archerfish in tanks of thousands of liters, otherwise total isolation is mandatory.
Aquarium Breeding: Incredibly rare and fortuitous, never intentionally achieved by hobbyists. They lay eggs on flat surfaces (smooth stones) and the male aggressively guards the nest in brackish waters. Commercially available specimens are almost all Asian wild catches.
Risks and Diseases: Toxic if eaten (tetrodotoxin). They suffer immensely in prolonged freshwater, experiencing kidney failure, severe fungal infections, and Ich. Dental overgrowth is the primary enemy, forcing the expert owner to physically trim the excess teeth under light clove oil anesthesia.
Origine et répartition géographiques
Widely distributed in the coastal zones of Southeast Asia (India, Sri Lanka, Indonesia, Philippines). As a juvenile, it inhabits fresh or brackish river waters, but as it matures, it progressively migrates towards mangrove estuaries and coastal marine habitats. Therefore, it requires environmental chemical modifications during its life.
Origine
Sélection et cultivarsAmérique du NordAsie du Sud et du Sud-EstOcéans tropicaux et récifs
Profil de poisson
- Tempérament
- Semi-aggressive
- They are fiercely aggressive, highly intelligent, and very interactive pets. They possess strong individual personalities and quickly learn to recognize their owners. Despite their endearing swimming style and cute appearance, they are ruthless predators.
- Régime alimentaire
- Omnivore
- Their diet must consist heavily of hard-shelled invertebrates to prevent their teeth from overgrowing. Snails, small crabs, mussels, and clams are essential staples that mimic their natural foraging habits. A varied diet of crunchy foods is absolutely critical to avoid manual dentistry.
- Espérance de vie
- 10-15 years
- Taille adulte
- 15 cm
- Ratio des sexes
- Group
- There are no visible differences between males and females, making sexing them nearly impossible. Due to their extreme aggression towards conspecifics, keeping them in groups is highly discouraged. Therefore, managing a specific sex ratio is not a practical concern for the home aquarist.
- Fréquence d'alimentation
- Twice daily
- Juveniles have high metabolisms and should be fed small portions daily. As they reach adulthood, feeding frequency should be reduced to every other day to prevent obesity. It is important to carefully portion their meals, as they are enthusiastic eaters that will gorge themselves.
- Charge biologique
- Medium to High
- The Green spotted puffer produces a high bioload due to its messy eating habits and carnivorous diet. They require heavy filtration and strict maintenance routines to keep water parameters pristine. Frequent, substantial water changes are essential to prevent health issues in their brackish setup.
- Courant
- Stagnant
- They enjoy a moderate to strong water flow that mimics the tidal estuaries they inhabit in the wild. Powerheads can be used to provide a strong current, which they will actively swim against. High oxygenation is crucial, and strong surface agitation helps achieve this.
- Risque de saut
- Yes
- They are very active and curious fish that pose a high jump risk if the tank is left uncovered. A tight-fitting lid is strictly required to keep them safely contained within the aquarium. Ensure that all gaps around filter pipes and heaters are securely blocked.
- Reproduction
- Oviparous
- Captive breeding of the Green spotted puffer is virtually unheard of in the home aquarium. Their complex life cycle, migrating from freshwater to marine environments, makes simulating breeding conditions difficult. Almost all specimens in the hobby are wild-caught.
- Compatibilité et compagnons
- Species only
- They are notoriously aggressive and fin-nipping, making them poor candidates for a community aquarium. They are best kept in a species-only tank, as they will harass and eventually kill most other fish. Invertebrates are completely out of the question, as they will be eaten immediately.
- Niveau dans le bac
- Middle
- They are highly active fish that utilize all levels of the water column. They will continuously patrol the tank, exploring the substrate for hidden snails and swimming through the mid-water. A complex environment with rocks and decorations provides them with necessary mental stimulation.
Modèles et paramètres scientifiques
FishBase
Fenêtre sur les données scientifiques officielles de l’espèce
FishBase v25.04Données synchronisées le : 15/06/2026
- Niveau trophique
- 3,4 ± 0,51 se
- Résilience
- Élevée (moins de 15 mois)
- Singularité phylogénétique (PD50)
- 0.5156
- Relation bayésienne longueur-poids
- a = 0.0263, b = 2.88
- VulnérabilitéVulnérabilité faible (10 / 100)
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