Peacock Gudgeon: A Comprehensive Guide (Tateurndina ocellicauda)
The Peacock Gudgeon, Tateurndina ocellicauda, is one of those fish that looks like it should be way more difficult than it actually is.
Bright colors, bold patterning, big eyes, and that signature “peacock” look—it almost comes off like a saltwater fish dropped into freshwater.
Males in particular develop:
- Electric blue and yellow coloration
- Red/orange edging in the fins
- A slightly bulbous forehead as they mature
And despite all that… they’re actually pretty manageable in the right setup.
This is one of those fish that:
- Looks like a showpiece
- But behaves well enough for a peaceful community
Origin & Habitat
This species comes from Papua New Guinea, where it inhabits:
- Slow-moving streams
- Shallow creeks
- Heavily vegetated areas
They’re typically found in:
- Warm, calm water
- Dense plant cover
- Areas with structure like roots and wood
They’re not open-water swimmers—they prefer to hang around structure and pick off food.
Size
- Adult Size: ~2 to 2.5 inches
- Body Type: Elongated with a slightly chunky head
They’re small enough for community tanks, but big enough to hold their own.
Tank Size
- Minimum Tank Size: 15 gallons
- Recommended: 20+ gallons
They do best in:
- Pairs or small groups
- Tanks with defined territories
More space helps reduce aggression between males.
Water Parameters
- Temperature: 74–80°F
- pH: 6.5–7.5
- Hardness: Soft to moderately hard
They’re fairly adaptable, but:
- Stability is key
- Sudden swings can stress them
Temperament
- Peaceful to semi-aggressive
- Territorial, especially males
This is where they’re a little different from typical community fish.
Important notes
- Males can be territorial with each other
- Best kept:
- As a pair
- Or 1 male with multiple females
They’re generally peaceful toward other species, but they will defend their space.
Tank Setup
This species really benefits from a well-structured tank.
Ideal setup
- Planted aquarium
- Caves (very important)
- Driftwood
- Moderate lighting
Why caves matter
Peacock gudgeons are:
- Cave spawners
- Territory-based
They need defined spaces or you’ll see more aggression.
Think:
Lots of structure, broken lines of sight, and hiding spots
Diet
They can be a little picky at first.
Staple foods
- Small pellets (once acclimated)
- Quality flakes
Preferred foods
- Frozen foods (bloodworms, brine shrimp)
- Live foods
Some individuals:
- Refuse dry food initially
- Take time to transition
Once settled, they’re much easier.
Tank Mates
They do well in peaceful community setups with the right fish.
Good tank mates
- Small tetras
- Rasboras
- Corydoras
- Peaceful bottom dwellers
Avoid
- Aggressive fish
- Fin-nippers
- Very fast, competitive feeders
They’re not aggressive, but they’re not built for chaos either.
Behavior
- Mid to lower water column
- Perch and hover behavior
- Territorial around caves
Males will:
- Display to females
- Guard territory
- Show off their fins and color
They’re very interactive and fun to watch—especially during breeding behavior.
Breeding
One of the easier cave-spawning fish to breed.
Spawning basics
- Cave spawners
- Male guards the eggs
- Eggs laid inside enclosed spaces
After spawning:
- Male stays with the eggs
- Fans and protects them
To encourage breeding:
- Provide caves (PVC, coconut shells, etc.)
- Feed heavily with quality foods
- Maintain stable water conditions
Why They’re So Popular
Simple:
They look incredible without being overly difficult.
- Bright coloration
- Interesting behavior
- Manageable care requirements
They hit that perfect balance of:
- Visual appeal
- Accessibility
Final Thoughts
If you want:
- A colorful, centerpiece-type fish
- Interesting behavior (especially breeding)
- Something a little different from standard community fish
The Peacock Gudgeon is a fantastic choice.
It’s one of those fish that keeps you watching the tank longer than you planned.
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