Freshwater Darwin Toafish (Marilyna darwinii) 8-10cm

Freshwater Darwin Toafish – Keep a Compact Adaptable Puffer in Your Tank

Freshwater Darwin Toafish displays a rounded body with greenish-yellow tones and grey mottling that shifts to yellowish-silver on the sides. This Marilyna darwinii species adapts from brackish origins to freshwater conditions when acclimated carefully. Melbourne hobbyists choose these fish for their friendly temperament and small adult size. Their hardy nature suits community tanks with proper setup.

Size and Lifespan

Reaches approximately 15 cm at maturity, making it suitable for medium aquariums. They commonly live 5–8 years with stable parameters and good nutrition. Consistent care helps them maintain activity and health over time.

Ideal Tank Setup

Prepare a tank of at least 100 litres to allow comfortable swimming. Use fine substrate, add live plants, rocks, and open areas for exploration. To replicate its natural habitat, include gentle flow and maintain brackish or freshwater conditions. Keep pH 7.0–8.5 and temperature 24–28°C with regular water changes.

Compatible Tank Mates

Remains peaceful and mixes well with similar-sized calm species. They rarely show aggression toward tankmates. Suitable tank mates include small community fish, shrimp, snails, and other non-nippy puffers. Avoid large predators or fin-nippers that could stress them.

Diet and Feeding

Feed a carnivorous diet with hard-shelled items to trim teeth. Offer frozen or live brine shrimp, bloodworms, and small crustaceans. Supplement with sinking pellets occasionally. Provide small meals once or twice daily and remove uneaten food promptly.

Breeding and Behaviour of Freshwater Darwin Toafish

Has limited captive breeding records due to specific brackish cues needed. These fish swim actively during daylight and rest near cover at night. They forage bottom areas and interact calmly in groups. Stable conditions encourage natural behaviours and reduce hiding.

Species Overview

• Species – Marilyna darwinii
• Common Name – Darwin Toadfish, Freshwater Darwin Toafish
• Origin – Western Pacific, Australia, Papua New Guinea
• Diet – Carnivorous
• pH Range – 7.0 – 8.5
• Temperature – Tropical 24°C – 28°C
• Breed Type – Egg Layer
• Current Size – 8-10cm
• Max Size – Approximately 15 cm
• Tank Size – Minimum 100 litres

FAQs about Freshwater Darwin Toafish

What size tank is ideal for Freshwater Darwin Toafish?
A 100-litre tank works for one or two, with larger volumes giving more room.

Can they live with other fish?
Yes, they get along with calm similar-sized species in community setups.

How often should I feed them?
Feed once or twice daily with small portions they finish quickly.

Do they need to be in groups?
They do fine singly or in small groups with enough space.

How long do they live?
They typically live 5–8 years with proper care and stable water.

Add a Freshwater Darwin Toafish to Your Aquarium Today!