Purple Spotted Gudgeon
Mogurnda adspersa
A beautiful spotted native gudgeon, hardy and full of personality.
| Difficulty | Beginner |
| Min. Tank Size | 75 L |
| Temperature | 12.0–28.0 °C |
| pH Range | 6.5–8.0 |
| Max Size | 12.0 cm |
| Lifespan | 3-5 years |
| Diet | Carnivore |
| Temperament | Semi-aggressive |
Overview
The Purple Spotted Gudgeon (Mogurnda adspersa) is a beautiful spotted native gudgeon, hardy and full of personality. It is a popular choice among Australian aquarists, reaching around 12 cm and living roughly 3-5 years when properly cared for.
This complete guide covers how to keep the Purple Spotted Gudgeon successfully - tank size and setup, water parameters, the best foods (including recommended brands), suitable tank mates, breeding, sexing and the health issues to watch for. It is rated Beginner to care for.
Natural Habitat & Origin
This is an Australian native species, adapted to local rivers and billabongs. Many natives tolerate cooler water and are hardy, but they often grow large and are powerful swimmers that need space.
Matching the temperature, water chemistry and cover a species evolved with is the simplest route to keeping it healthy and seeing its natural behaviour and colour.
Tank Size & Aquarium Setup
Provide a minimum of 75 litres for the Purple Spotted Gudgeon. A roomy, well-decorated tank lets a pair settle and behave naturally.
A tight-fitting lid is essential - this species is a capable jumper.
Live plants, driftwood and shaded retreats give security and show off the fish's colours against a natural backdrop.
Always add fish only to a fully cycled, mature tank with stable biological filtration. Provide strong, well-oxygenated flow for this active, oxygen-hungry species.
Water Parameters
Keep the Purple Spotted Gudgeon in stable water at 12-28 °C with a pH of 6.5-8.0. It adapts to a moderate range, so stability matters more than an exact figure.
Test regularly: ammonia and nitrite must read zero, and nitrate should be kept low with routine partial water changes. Always dechlorinate and temperature-match new water, because sudden swings cause far more illness than water that is stable but slightly imperfect.
Diet & Feeding
The Purple Spotted Gudgeon is a carnivore and needs a protein-rich, meaty diet.
In Australia, good options include Hikari Carnivore/Massivore pellets, API Carnivore food and Dymax frozen bloodworm, brine shrimp, krill and mussel. Feed small amounts once or twice a day (only what is cleared in a minute or two), vary the diet for the best colour and health, and avoid overfeeding, which is the leading cause of poor water quality.
Temperament & Tank Mates
The Purple Spotted Gudgeon is semi-aggressive: generally community-tolerant but territorial at times, especially when breeding or under-stocked. Avoid very small, slow or long-finned tank mates and give everyone space.
Breeding
The Purple Spotted Gudgeon is a cave spawner. Provide a snug cave or pipe; the male guards and fans the eggs until the fry are free-swimming.
Even if you are not planning to breed it, recognising this behaviour helps you understand what you are seeing and respond well - for example by adding cover for fry or giving a guarding pair extra space.
How to Tell Males from Females
Sexing varies by species; males are often more colourful in breeding season while females are rounder when carrying eggs.
Common Health Problems
Like most aquarium species it can suffer from white spot (ich), fin rot and fungal or bacterial infections, almost always triggered by stress or poor water quality. Quarantine new arrivals for 2-4 weeks and watch daily for early signs such as loss of appetite, unusual hiding, clamped fins or laboured breathing - caught early, most issues are very treatable.
Prevention beats cure: keep water pristine, avoid overstocking and overfeeding, quarantine new arrivals, and act at the first sign of trouble.
Is the Purple Spotted Gudgeon Right for You?
The Purple Spotted Gudgeon suits beginners and experienced keepers alike, as long as you can provide at least 75 litres, water at 12-28 °C and pH 6.5-8.0, the right diet and suitable tank mates.
Meet those needs and the Purple Spotted Gudgeon will reward you for around 3-5 years. Use our free aquarium calculators to plan your setup, and explore our other fish, plant and disease guides to build a thriving aquarium.
How to Tell Males from Females
Sexual dimorphism is limited. Females tend to be fuller-bodied when in breeding condition and males slightly slimmer or more intensely coloured, but reliable sexing generally requires mature fish observed side by side, or spawning behaviour.
