Philippine Blue Angelfish: The Blue Gene, and What a Pinoy Is
There is no blue pigment in this fish — the colour is structural. The gene behind it is recessive, so it takes two copies before any blue shows at all, and a Pinoy is not simply more of it: that is the same pair of blue genes with the Dark gene underneath. The care is the same as any other scalare.
| Scientific name | Pterophyllum scalare (Philippine Blue variety) |
|---|---|
| Group / family | Cichlidae (freshwater angelfish) |
| Adult size | ~6 in (15 cm) body; fins extend taller |
| Minimum tank | 29 gal tall (18 in) for a pair; 55+ gal for a community |
| Water | 76–82°F (24–28°C), pH 6.5–7.5, soft to moderately hard |
| Diet | Quality flakes/pellets, frozen brine shrimp, bloodworms, occasional vegetables |
| Temperament | Semi-aggressive; territorial during breeding |
| Lifespan | 10–15 years with proper care |
There is no blue pigment anywhere in a Philippine Blue Angelfish. The colour is structural: the "Philippine Blue" (pb) gene changes the way light reflects off the scales, so the sheen shifts with the lighting and the angle you look from, and it can look silver from the wrong side of the tank. That is also why photographs of this fish disagree with each other so much.
The gene is recessive, which is where most of the confusion about the name starts. A fish needs two copies of it before any blue shows at all; one copy shows you nothing and is carried invisibly. And a Pinoy is not a stronger dose of blue — it is the same two blue genes with a separate gene, Dark, underneath. The section below sets out what that means if you are buying or breeding. Everything else about the fish — size, water, temperament, lifespan, tank mates — is an ordinary Pterophyllum scalare, identical to the Silver it was bred out of.
I bought my pair because I did not believe the photographs. What I had read was that someone in the Philippines had come across the variety around 2009, and every picture of it online looked retouched to me — so when I found a pair at an aquarium a few kilometres from my house, I bought them mainly to find out whether the fish was real. It is. It also came home grey, which is what the note further down is about.
Appearance & Identification
Base body color ranges from silver to platinum, with the blue sheen laid over it. The intensity of the blue varies with the fish's mood, health, lighting, and genetic makeup.
Mine looked like ordinary grey angelfish on the way home, and I wondered whether I had bought the wrong fish. I had gone to that aquarium specifically for a Philippine Blue. What was in the polythene bag was grey — not a duller blue, grey — and the difference was obvious enough that I questioned whether I had been given the right pair. Being caught and carried across town is the obvious explanation. The blue came back once they had settled in.
I cannot tell you what was happening inside the pigment cells. I did not look into it at the time and I am not going to reconstruct it now. What I can report is what I saw: grey in the bag, the blue sheen back after they settled down, and nothing done by me in between.
The practical use of this is for anyone buying one. A Philippine Blue in a shop bag, or in a tank it was moved into that morning, is not showing you its colour — and neither is a fish that has just been chased around with a net for you. Judge a fish in a tank it has been sitting in undisturbed. And if you get one home and it looks like the wrong fish, give it a few days in settled water before you conclude anything.
The Blue Gene, and What a Pinoy Is
The Philippine Blue gene is written pb, and it is recessive. That one fact accounts for most of what confuses people about this fish:
- pb/pb — two copies. This is a Philippine Blue, showing the iridescence the variety is named for.
- pb/+ — one copy. Not blue. The fish looks like whatever it otherwise would be and carries the gene silently.
- D/+ pb/pb or D/D pb/pb — two blue genes plus one or two copies of the Dark gene. That is a Pinoy.
So a Pinoy is not a Philippine Blue with the volume turned up. It is the same pair of blue genes with a different gene laid underneath — Dark, the one that also produces the Black Lace at one copy and the Double Dark at two. The dark body comes from Dark; the blue sits over it.
What that means in practice. Two Philippine Blues bred together breed true, because pb/pb × pb/pb can only produce pb/pb. Cross a Philippine Blue to a fish carrying no pb and you get no blue fry at all — every one of them an ordinary-looking carrier. The blue reappears only when two of those carriers are bred back together, which is why it can seem to vanish from a line for a generation and then return. It also means a shop fish sold as "Philippine Blue" that shows no blue is either mislabelled or a carrier, not a fish that will colour up later.
Genotype notation follows the standard hobby references for Pterophyllum scalare genetics; see Angels Plus on angelfish genetics, which records the blue mutation as recessive and expressed when homozygous.
Behavior & Temperament
Like all angelfish, the Philippine Blue is a cichlid with a classic cichlid personality: generally peaceful but can become territorial with their own kind and may bully smaller, more timid fish, including preying on very small fish like nano rasboras or newborn shrimp.
- Excellent tank mates: larger tetras (Black Skirt, Serpae), Corydoras catfish, Plecos, Rainbowfish, and Gouramis.
- Avoid: fin-nippers like Tiger Barbs, and fish small enough to be eaten such as Neon Tetras or Guppies.
See our full Angelfish Tank Mates guide for a complete list.
Aquarium Setup and Care
- Tank shape: height matters more than length; a minimum height of 18 inches (45 cm) is recommended.
- Decor: broadleaf plants like Amazon Swords and Anubias, plus driftwood or vertical slate for security and potential spawning sites.
- Water quality: clean and stable, with regular water changes (25% weekly) and a high-quality filter to keep colors vibrant.
- Diet: a varied diet is key to health and coloration — a high-quality cichlid flake or pellet as a staple, supplemented with frozen or live brine shrimp, daphnia, and bloodworms.
Water Parameters & Maintenance
Temperature 76–82°F (24–28°C), pH 6.5–7.5, soft to moderately hard (3–10 dGH). Perform weekly water changes of 20–30% to keep water quality high and colors vibrant.
Breeding Tips
Philippine Blue Angelfish form monogamous pairs and spawn on flat surfaces such as leaves or aquarium glass. Condition breeding pairs with protein-rich live foods. Some pairs guard their eggs diligently, while others may eat them if stressed — consider removing eggs to a separate hatching tank in that case. The breeding process itself is identical to most freshwater angelfish; see our full breeding guide for details.
Related Angelfish
Frequently Asked Questions
How big do Philippine Blue Angelfish get?
They typically reach about 6 inches in body length, with long fins that make them appear taller.
Is a Pinoy the same as a Philippine Blue?
No, and it is not simply a deeper one either. The Philippine Blue gene (pb) is recessive, so a Philippine Blue is pb/pb — two copies. A Pinoy is that same pb/pb plus at least one copy of the separate Dark gene, written D/+ pb/pb or D/D pb/pb. The Dark gene supplies the dark body and the blue sits over it, which is why a Pinoy looks like a different fish rather than a stronger version of the same one.
Will a Philippine Blue with no blue on it colour up later?
Not if it has only one copy of the gene. Because pb is recessive, a fish carrying a single copy looks ordinary its whole life and simply passes the gene on. A genuine pb/pb fish shows its iridescence once it is settled and mature. A fish that stays plain is either a carrier or mislabelled — though do give a newly bought fish a few days to settle before you judge, since stress alone can wash the blue out temporarily.
Are Philippine Blue Angelfish natural?
They are a selectively bred variety of Pterophyllum scalare, developed for their metallic blue coloration.
Can I keep them in a community tank?
Yes, choose peaceful tank mates and provide a sufficiently large, tall aquarium. Avoid fin-nippers and aggressive cichlids.
Why has my Philippine Blue turned grey?
Stress will do it. Mine looked like plain grey angelfish in the bag on the way home from the aquarium, and the blue came back once they had settled into the tank. Being netted, bagged, transported or moved to a new tank are all likely triggers. If a fish that has been settled for a while stays grey, treat that as a health or water-quality question rather than a colour one.
How do I enhance their blue color?
Use good lighting, maintain excellent water quality, and feed a varied diet with high-quality proteins and occasional frozen or live foods.
Do they need live plants?
Not strictly, but live plants help mimic their natural environment, reduce stress, and encourage natural behavior.
Are they hard to breed?
They can be bred at home with stable water conditions and flat spawning surfaces. If parents eat eggs, hatch them in a separate tank.