Golden Tropical Mussel (Pilsbryoconcha sp.)

Meet the Golden Tropical Mussel, a honey-gold filter feeder

The Golden Tropical Mussel is a freshwater mussel of the genus Pilsbryoconcha from Southeast Asia, sold for its long, honey-gold shell. The animal in our photographs has an elongated, tongue-shaped shell in warm gold and amber, darkening to brown along the lower edge, with fine growth lines and a glossy finish. It lives partly buried in soft sand with only the rear edge showing, filtering fine particles from the water. It is a quiet, slow, fascinating animal for a keeper who is ready to feed it properly, which is the hard part.

The genus was named by Simpson in 1900, with the type species Anodonta exilis Lea, 1838, now Pilsbryoconcha exilis, according to the MUSSEL Project genus list. It belongs to the Unionidae, the family of river and pond mussels. Browse our other bivalves in the molluscs category and our snails in the snails collection.

Check the names on the label

A 2022 revision by Jeratthitikul and colleagues recognised eight genetically confirmed Pilsbryoconcha species, four of them new to science, plus a ninth from Sumatra that was not sequenced. The authors found the species difficult to tell apart from the shell, especially when young, and separated them by DNA. That is why this mussel is sold as Pilsbryoconcha sp. rather than under a species name. The most widespread species, P. exilis, is recorded from Thailand, Laos, the Malay Peninsula, Singapore and Java.

Shell colour varies. The 2022 study describes the outer shell layer of most species as greenish to dark brown, and one species as yellowish to green, more yellowish in young specimens. Expect individuals to differ from the photographs, and the colour may change as the shell grows.

Decide whether your aquarium can feed a mussel

Freshwater mussels are filter feeders. Wikipedia's article on freshwater bivalves describes them removing fine silt, organic matter, bacteria and phytoplankton from the water, trapping the particles on mucus as water passes over the gills. A clean, well-filtered aquarium holds very little of that food. In our judgement, starvation is the commonest reason aquarium mussels die, and it happens slowly and out of sight, because a closed shell gives no clue that the animal inside is losing condition. We found no published survival figures for Pilsbryoconcha in aquariums, so we do not quote one.

Run a four-point tank check

Our tank volume calculator gives the litres from your tank's dimensions.

Know what one purchase brings

One purchase quantity is one live Golden Tropical Mussel, supplied at the Medium size grade. The grade describes the animal on the day of dispatch rather than a fixed measurement, and the photographs show the colour form rather than the individual you receive, so shape, colour and size vary. For adult size, the 2022 study measured its type specimens at 68.6–106.2 mm long, depending on the species. Those are reference specimens, not maximum sizes, so plan for a mussel of around 10 cm.

Check the mussel on arrival

• A living mussel holds its shell shut, or closes it, when lifted or touched.
• A shell that gapes and will not close, or a bad smell, means the mussel has died. Do not add it to the tank; contact us using the details on our delivery page.
• Keep the bag dark and at room temperature while you prepare to acclimatise it.

Lay a deep, soft sand bed

Wikipedia's account of the Unionidae explains that adult mussels burrow into the bottom with the rear margin of the shell exposed. That rear edge carries the openings through which water enters and leaves, so a mussel needs a bed it can sink into, upright and steady. Coarse gravel prevents this and can damage the soft foot.

Set up the bed step by step

1. Lay fine, rounded aquarium sand across at least part of the tank, deep enough to bury most of the shell upright.
2. Choose an area of gentle, steady flow: enough to carry food past the mussel, not so strong that it blows sand away.
3. Place the mussel on the sand, hinge side up, and let it dig in on its own; do not push it in.
4. Note where it settles. A mussel moves slowly with its foot and may shift a little over days.

Match water values

No checked source publishes aquarium water values for Pilsbryoconcha, so we will not invent them. The genus comes from tropical Southeast Asia, where the 2022 study collected it from rivers and streams and one species from a man-made pond beside a paddy field, so it belongs in a heated tropical aquarium. The table gives OATA's general guidance for tropical freshwater invertebrates; treat it as a safe envelope rather than a species-specific optimum.

Read the table as general guidance

Mussel shells are made of calcium carbonate, which acidic water slowly dissolves, so avoid the soft, acidic end of the range and keep pH steady. OATA asks for weekly tests of ammonia, nitrite, nitrate, pH and hardness, a 25% water change at least weekly with conditioned water, and filter media rinsed only in removed tank water. Those steps matter even more when you are adding food for a filter feeder. Our water matcher compares your tap water with these values, and our nitrogen cycle guide explains why ammonia must stay at zero.

Feed a filter feeder little and often

The Golden Tropical Mussel cannot graze or chase food. It eats only what drifts into its inhalant opening, so feeding means putting a fine suspension of food close to it. Aquarium Glaser, describing another Southeast Asian aquarium mussel, notes that such mussels must be fed with a suspension of yeast in water placed near them with a pipette. Ready-made options include liquid or powdered mussel food such as Muschel-VITAL, and very fine frozen foods such as frozen filter feeder food and microplankton, thawed and diluted.

Build one measured target feed

1. Mix a small amount of food with a cup of tank water until the water is just cloudy.
2. Turn the filter down or off for a short while, so the food is not swept away.
3. Release the suspension slowly from a pipette or syringe just above the mussel's exposed rear edge.
4. Restore the filter after the cloudiness has settled or cleared.
5. Repeat in small amounts most days rather than in one large dose, and test ammonia regularly, because uneaten fine food decays quickly.

Fish and shrimp will pick at the cloud too, which is fine; it simply means a little more food may be needed.

Introduce the mussel slowly

Use the floating-bag method OATA recommends for invertebrates. Switch off the lights, float the sealed bag for about 10 minutes to equalise temperature, then add small amounts of tank water to the bag over at least 30 minutes. Lift the mussel out by hand, place it on the sand hinge side up, and discard the bag water. Our acclimatisation guide explains the method step by step.

Run a first-week checklist

Plan for glochidia

Like other unionid mussels, Pilsbryoconcha reproduces through a larval stage called the glochidium, which must attach to a fish for a while before dropping off as a tiny mussel. Pfeiffer and colleagues (2018) record Pilsbryoconcha as brooding its young in all four gills and producing glochidia without hooks. Wikipedia's glochidium article explains that the larvae attach to gills, fins and scales; under normal circumstances they do little harm, but heavy infections can greatly reduce a fish's ability to breathe.

Know what to do if specks appear

Aquarium Glaser notes that a few glochidia look much like white spot to the naked eye and do no harm, while a mass infection may be fatal, and that no medicine can kill them in the skin without harming the fish. Its advice is to separate the mussel from the fish if glochidia are seen, as they are released over several days or weeks. If you do treat fish for a confirmed disease, move the mussel out first: OATA warns that shrimp and snails are very sensitive to copper, and even low levels can kill them; treat mussels with the same care.

Spot a failing mussel early

A mussel that dies unnoticed can foul a tank quickly. A short daily look and a gentle weekly touch catch problems in time.

Match the sign to the action

Choose tank mates that leave it alone

A mussel needs calm companions that will not pick at its soft parts or keep digging it up. OATA's advice for snails, which applies just as well to mussels, is to avoid fish that eat them, such as pufferfish and loaches, and Wikipedia's freshwater bivalve article notes that invasive crayfish prey on mussels in Europe. Filter-feeding fan shrimp such as the Wood / Bamboo Shrimp are peaceful but compete for the same fine food, so feed more if you keep both.

Screen companions with this table

For a quick check of a particular mix, try our tank mates checker. If you are comparing bivalves, our Batman Clam is a larger specialist mussel, and the Purple Asian Clam is a small clam with its own needs.

Know its place in the wild

The 2022 study describes Pilsbryoconcha as an important food resource in its home range, used in fish farming as a living filter to reduce suspended particles, and sold as ornamental pets. It also traces the genus back about 43 million years to the Khorat Plateau of north-eastern Thailand, from where it spread across Indochina as river systems changed.

Never release it

OATA's advice is never to release aquarium animals or plants into the wild, and to dispose of old tank water and substrate where it cannot reach a natural watercourse. A tropical mussel will not survive a British winter outdoors, and its larvae ride on fish, so it must stay in your aquarium. If you can no longer keep it, pass it to another aquarist. Delivery and arrival details are on our delivery page, and our water chemistry guide explains pH and hardness in plain terms.

Answer Golden Tropical Mussel buying questions

Which species is the Golden Tropical Mussel?

It is sold as Pilsbryoconcha sp., a genus of Southeast Asian freshwater mussels. A 2022 study recognised eight genetically confirmed species and found them hard to tell apart from the shell, especially when young, so we do not name a species.

Is it the same as the invasive golden mussel?

No. The invasive golden mussel is Limnoperna fortunei, a different family of mussels that clings to hard surfaces and fouls pipes. The Golden Tropical Mussel is a burrowing unionid mussel named for its honey-gold shell.

Will it clean my aquarium water?

Only a little, and that is not a reason to buy one. It filters fine particles from the water, but a mussel needs that food to survive, and a well-filtered tank rarely contains enough. Plan to feed it; do not rely on it as a filter.

How do I feed a Golden Tropical Mussel?

Give small target feeds of a fine filter-feeder food, a liquid mussel food or a little yeast stirred into tank water, released near the mussel with a pipette while the filter flow is reduced. Feed little and often and test ammonia regularly.

How big does it grow?

The type specimens measured in the 2022 study were about 6.9–10.6 cm long, depending on the species. They are not maximum sizes, so plan for a mussel of around 10 cm. This listing is supplied at the Medium grade.

Can it live with fish and shrimp?

Yes, with peaceful community fish, dwarf shrimp and snails. Avoid pufferfish, loaches that eat molluscs, crabs and crayfish, and digging fish that keep uprooting it. Fan shrimp compete with it for the same fine food.

How can I tell if it is alive?

A healthy mussel closes when touched, slowly buries itself, and shows its rear edge above the sand. A shell that gapes and will not close, or a bad smell, means it has died and must be removed before it fouls the water.

Will it breed in my aquarium?

It is very unlikely. Like other unionid mussels it has a larval stage, called glochidia, that must spend time attached to a fish. Its natural host fish are not described in the sources we checked, so breeding cannot be planned.

Consult the care references

Every figure on this page comes from these sources, checked in November 2026. No checked source gives species-specific aquarium water values, survival figures or host fish for Pilsbryoconcha, and the page says so where that matters.

• Jeratthitikul, Paphatmethin, Sutcharit, Ngor, Inkhavilay & Prasankok (2022), Phylogeny and biogeography of Indochinese freshwater mussels in the genus Pilsbryoconcha Simpson, 1900 (Bivalvia: Unionidae) with descriptions of four new species. Scientific Reports 12: 20458
• Pfeiffer, Graf, Cummings & Page (2018), Journal of Molluscan Studies 84: 404–416 (classification and brooding traits of Southeast Asian mussel genera)
• The MUSSEL Project: genus Pilsbryoconcha Simpson, 1900
• MolluscaBase: genus Pilsbryoconcha Simpson, 1900 (accepted species)
• Wikipedia: Pilsbryoconcha
• Wikipedia: Unionidae
• Wikipedia: Freshwater bivalve
• Wikipedia: Glochidium
• Wikipedia: Limnoperna fortunei (golden mussel, an unrelated invasive species)
• Aquarium Glaser: Scabies crispata (feeding and glochidia notes for aquarium mussels)
• OATA: How to look after freshwater shrimp and snails