Blue Orfe (Leuciscus idus)

Choose a silver-blue shoaling fish for a large pond

The Blue Orfe is a colour form of the ide, Leuciscus idus, a long, streamlined river fish that has been bred for garden ponds. Its body is silver washed with steel-blue along the back, the scales are fine and evenly set, and the lower fins carry a soft pink tint. A group of blue orfe cruising together just under the surface is one of the liveliest sights a large pond can offer, and the cool colour sits well beside gold and red pond fish. It is not a fish for a small pond or an aquarium: it grows long, swims fast and needs plenty of oxygen.

The wild ide is a European and Asian fish. FishBase gives its native range as the Baltic, Black, northern Caspian and North Sea basins, east as far as the Lena drainage and the Aral basin, where adults live in large lowland rivers and nutrient-rich lakes. It was introduced to Great Britain and has been carried to other countries as an ornamental fish. FishBase places it in the family Leuciscidae; older references, including the OATA pond fish care sheet, still group it with the carps in Cyprinidae.

Know the names you will see

The Maidenhead Aquatics fish database describes the blue form as the most recently developed of the three colours, usually sold alongside gold and the rarer wild silver type, and notes that all three can be mixed freely. If you already keep our Golden Orfe, a few blue fish make a natural mixed shoal. Browse more pond species in our golden orfe and golden tench range and the wider coldwater pond fish category.

Know exactly what you receive

One purchase supplies one live Blue Orfe in the size you choose: 2–3 in (about 5–8 cm) or 5–6 in (about 13–15 cm). Both are young fish with a long way to grow. The smaller size suits a pond that is still building up its stock, because small fish add little waste at first and settle quickly. The larger size makes an immediate show and is better placed to hold its own in a pond that already has big koi or goldfish. Sex is not chosen or guaranteed; mature females are usually fuller-bodied than males.

The photographs show the colour form, not the individual fish. Expect some difference in how much blue shows along the back and how pink the fins are, and remember that colour and body shape change as an orfe grows.

Plan a group, not a single fish

• Pond group: the OATA pond fish care sheet says orfe should be kept in groups of four or five, otherwise they are likely to become stressed.
• Why it matters: FishBase notes that wild juveniles are gregarious, so young orfe settle best with others of their kind; wild adults tend to be more solitary, but pond keepers keep them as a shoal.
• Buying together: fish of the same size introduced together settle as a group and compete fairly at feeding time.
• Mixing colours: blue, golden and silver orfe are the same species, so a group can be made up of more than one colour.

Before you order, check our delivery and Live Arrival Guarantee information, so the pond is ready and someone is home when the fish arrive.

Plan the pond around a fish that outgrows most tanks

Orfe are big fish, and sources give different figures for how big. FishBase records a maximum of 85 cm standard length in the wild, a common length of 30 cm and a published weight of up to 4 kg, with a reported age of 29 years. OATA says orfe, koi and tench can grow up to 75 cm, and the Maidenhead Aquatics database gives 60 cm or more for blue orfe. In a garden pond, plan for a fish of at least 40–60 cm that may live for decades.

That size decides the pond. OATA recommends that koi, tench and orfe are kept in a pond of 4,500 litres or more, and that fish ponds are at least 45–60 cm deep. Depth keeps temperatures steadier, with a cool zone at the bottom during warm spells and a warmer zone in a freezing winter. The Maidenhead Aquatics database adds that orfe suit large ponds with good water movement, including ponds that are too shallow for carp.

Run a three-step pond check

1. Measure the volume. Work out the litres from the length, width and average depth; our tank volume calculator turns dimensions into litres for any rectangular body of water. Aim for 4,500 litres or more.
2. Count adult lengths, not sale sizes. The Maidenhead Aquatics pond guide suggests a rule of thumb of 25 cm of fish per 455 litres (100 imperial gallons), counting the eventual adult size. By that rule a 4,500-litre pond holds about 245 cm of adult fish, so a group of four orfe at 60 cm uses almost all of it.
3. Add the rest of the stock. If the pond also holds koi or large goldfish, it needs to be bigger again. Our stocking calculator helps you add everything up.

An orfe is not an aquarium fish. FishBase states that the species is not recommended for home aquariums and that keeping it indoors would take at least 10 fish in a tank more than 200 cm long.

Build in oxygen, flow and open water

Oxygen is the most important thing to get right. The Maidenhead Aquatics database says orfe prefer oxygen-rich water and can struggle in small ponds with slow-moving water, and that a waterfall or stream helps keep oxygen levels up overnight. OATA notes that a pump or fountain helps to circulate and oxygenate any pond. The Maidenhead Aquatics pond guide points out that oxygen matters most on hot summer days and at night, when pond plants give off carbon dioxide, and that a rippling surface shows oxygen is going in.

Divide the pond by function

For the site, the OATA garden pond guide suggests a level spot with roughly four to six hours of sun a day and some shade, away from trees that drop leaves into the water. OATA recommends a mix of marginal, submerged and floating plants, which add oxygen, take up pollutants and give shelter. The Maidenhead Aquatics database notes that orfe do not eat plants, so planting a pond for them is straightforward.

Keep the water cool, clean and steady

Orfe are fish of cool, temperate water. The three sources below agree on the broad picture but differ on the exact ranges, so the table shows each one.

The range all three share is about 4–20°C, pH 7.0–7.5 and 10–15 dGH. Waste readings matter even more: OATA asks for ammonia and nitrite at zero, and nitrate no more than 20 mg/l above your tap water. The OATA garden pond guide gives a looser nitrate limit of 50 mg/l above tap water, so treat 20 mg/l as the target and 50 mg/l as the point to act.

Treat every top-up from the tap

UK tap water is treated with chlorine or chloramine, and OATA advises treating all new tap water with a conditioner before it reaches the pond. The Maidenhead Aquatics database adds that orfe are sensitive to heavy metals in tap water, another reason to use a good conditioner every time you top up after evaporation. Your water company publishes hardness and pH for your postcode. Our water matcher compares readings with a fish's range, and the water chemistry guide explains pH, GH and KH. Conditioners and test kits are in our water care and treatment range.

Filter for adult stock and test every week

OATA is clear that any pond holding fish needs a filter, because the bacteria that grow on its media break down toxic ammonia and nitrite. Those bacteria take time to build up, so add fish slowly. Overstocking, or stocking too quickly, causes what OATA calls new pond syndrome: there are not enough bacteria for the waste, ammonia and nitrite rise, and fish fall ill or die. Our guide to the nitrogen cycle explains the process, and the filtration guide covers how filters work.

Follow a weekly pond routine

1. Test ammonia, nitrite, nitrate, pH and hardness every week, as OATA advises, and write the results down so changes stand out.
2. Check the flow from the filter return. The Maidenhead Aquatics pond guide suggests cleaning the filter as soon as the flow drops; a well-run filter may only need it a few times a year.
3. Rinse filter media in pond water, never under the tap, so the bacteria survive.
4. Top up with conditioned water and keep the waterfall or fountain running.
5. Count the shoal. Orfe swim near the surface, so a missing fish is easy to notice.

If the pond has a UV unit, OATA suggests replacing the bulb about once a year, following the maker's instructions.

Feed by the water temperature

In the wild, FishBase records the ide eating a wide range of aquatic and land animals as well as plant material, with the largest fish feeding mainly on other fish. In the pond, the Maidenhead Aquatics database lists pond flakes, pellets and sticks, live and frozen foods and insects, and notes that young orfe eat large numbers of mosquito larvae. OATA explains that pond fish appetite follows water temperature: summer feeding builds condition, and as the water cools a lower-protein, more digestible food such as wheatgerm is better.

Build one measured meal

• Warm months: a floating staple such as Tropical Pond Sticks Mixed or Tropical Pond Flakes.
• Cooling water: a wheatgerm food such as Tropical Koi & Goldfish Wheat Germ & Garlic.
• Treat: thawed Koi and Goldfish Special frozen food now and then in summer.
• Portion: only what the fish clear within a few minutes, once a day, as OATA advises. Uneaten food rots and adds waste.

The sources set the cut-off slightly differently, 8°C for OATA and around 10°C for Maidenhead Aquatics, so use a pond thermometer and lean towards feeding less. Browse every food in our fish food range.

Introduce new orfe in the warmer months

The OATA garden pond guide advises against adding fish in winter, when their immune system is inactive, so plan purchases for spring to early autumn. Check that ammonia and nitrite read zero before the fish arrive. OATA's method is to keep the bag out of bright light, float it in the pond for 10 minutes so the temperatures match, then add small amounts of pond water to the bag before releasing the fish with as little bag water as possible. Our guide on how to acclimatise new fish walks through each step.

OATA recommends netting a pond after adding new fish, because fish are more likely to try to jump out during their first couple of weeks somewhere new. Orfe are known jumpers: the Maidenhead Aquatics database notes that they leap out of ponds during summer storms.

Use a first-week checkpoint plan

Choose pond companions by size and pace

OATA says most pond fish are compatible with each other, though they may need slightly different conditions. The Maidenhead Aquatics database describes orfe as hardy, active and sociable, but adds two cautions: large orfe will eat small fish, while ignoring fish too big to swallow, and their constant activity can make koi more nervous. The same database notes that orfe can help keep down goldfish egg numbers in larger ponds.

Screen each companion

Check a planned mix with our tank mates tool, read the cold water fish buying guide, or browse all goldfish and coldwater fish.

Watch its health and act early

OATA lists the signs of a healthy pond fish: clear, bright eyes, undamaged fins, intact scales with no ulcers or bumps, normal swimming and steady breathing. Signs of trouble include clamped fins, flicking against the sides or décor, shimmying, hanging at the surface, sitting on the bottom, a change of colour, faster or slower gill movement, white spots or fluffy growths, and loss of appetite. OATA also advises watching closely as the water warms in spring, because the immune system can be weak after winter.

The Maidenhead Aquatics database describes orfe as hardy and seldom affected by disease, but sensitive to certain medications. Always read the label before treating a pond that holds orfe, and check that the product is safe for them.

Pair each sign with an action

Understand breeding and the law

Orfe rarely spawn in garden ponds. FishBase describes wild adults migrating into tributaries to spawn over gravel or submerged plants in moderate current, with each female spawning once a season and attaching sticky eggs to the gravel or plants. The Maidenhead Aquatics database suggests running water is the key trigger, which explains why spawning in still garden ponds is unusual.

Keep it in the pond

In England and Wales, government guidance lists ide or orfe among the non-native fish you do not need a licence to keep. That does not extend to letting them go: OATA states that releasing aquarium or pond animals into the wild is illegal, usually kills the fish and can harm native wildlife. If you need to rehome orfe, pass them to another pond keeper or ask a local aquatic shop.

Answer Blue Orfe buying questions

What is a Blue Orfe?

It is a silver-blue colour form of the ide or orfe, Leuciscus idus, a streamlined fish from the rivers and lakes of Europe and Asia that is kept in garden ponds. It is the same species as the golden orfe, so the care is the same and the two colours can share a pond.

How big does a Blue Orfe grow?

Plan for 40–60 cm or more. The Maidenhead Aquatics fish database gives 60 cm or more for blue orfe, OATA says orfe can reach 75 cm, and FishBase records wild ide up to 85 cm standard length.

What size pond does a Blue Orfe need?

OATA recommends a pond of 4,500 litres or more for orfe, at least 45–60 cm deep, with a filter and moving, well-oxygenated water from a waterfall, stream or fountain.

How many orfe should I keep together?

OATA advises groups of four or five, otherwise orfe are likely to become stressed. Blue, golden and silver orfe are one species, so a group can mix the colours.

Can I keep a Blue Orfe in an aquarium?

No. FishBase does not recommend the species for home aquariums and says indoor keeping would need at least 10 fish in a tank more than 200 cm long. It is a pond fish.

Will orfe eat my other fish or my plants?

The Maidenhead Aquatics database says large orfe eat small fish but ignore fish too big to swallow, and that they do not eat plants. They also take goldfish eggs, which can help keep numbers down in a big pond.

Should I feed orfe in winter?

OATA says it may be better not to feed at all once the water falls below 8°C; the Maidenhead Aquatics pond guide switches to wheatgerm food at around 10°C and stops feeding in winter. Restart slowly in spring.

Do I need a licence to keep orfe?

Not in England and Wales: government guidance lists ide or orfe among the non-native fish you can keep without a licence. Never release them into the wild.

How many fish come with one purchase?

One live Blue Orfe in the size you choose, 2–3 in or 5–6 in. Sex is not chosen or guaranteed.

Consult the care references

• OATA: How to look after pond fish — UK guidance on pond fish water values, sizes, group sizes, pond volume and depth, seasonal feeding, winter care, health signs and breeding.
• OATA: How to set up and look after your garden pond — UK guidance on siting, building, maturing and stocking a garden pond, adding fish and keeping herons and otters out.
• FishBase: Leuciscus idus (ide) — native range, family, maximum length, weight and age, water values, wild diet, spawning and aquarium suitability.
• Maidenhead Aquatics fish database (fishkeeper.co.uk): Blue Orfe — blue orfe size, water values, oxygen needs, behaviour, diet, sensitivities, jumping and colour forms.
• Maidenhead Aquatics: Taking care of goldfish in a pond — pond stocking rule, filter cleaning, seasonal feeding temperatures, oxygen and plant cover for goldfish ponds.
• GOV.UK: Introduce or keep non-native fish — England and Wales guidance listing goldfish and ide or orfe among the non-native fish you can keep without a licence.
• Tropical Fish Co delivery policy — current dispatch days and Live Arrival Guarantee terms.