Sturgeon can be fascinating fish to keep in a garden pond, but they are not suitable for every pond. They grow large, need cool and well-oxygenated water, require specialised food and can live for many years. A small juvenile sold in an aquatic shop may therefore represent a much bigger commitment than its size suggests.
The first question should not be simply "Can I keep a sturgeon?" but rather "Can my pond provide suitable conditions for this particular species when it is fully grown?" Different sturgeon species can reach very different adult sizes, so it is important to know exactly which species you are buying.
Sturgeon can live in suitable garden ponds, including ponds that also contain koi or goldfish, but they need considerably more space and oxygen than many ordinary pond fish. The pond should be mature, well-filtered and large enough for the adult fish.
They should be fed a specialised sinking sturgeon food and, unlike koi and goldfish, should not automatically be left without food throughout the winter.
What kind of fish is a sturgeon?
Sturgeons are an ancient group of ray-finned fishes with a very distinctive appearance. Instead of the overlapping scales seen on koi or goldfish, they have five rows of hard bony plates called scutes along the body. Their internal skeleton is largely cartilaginous.
They also have a downward-facing, protrusible mouth and four sensory barbels beneath the snout. These features are adaptations for finding and collecting food from the bottom.
Wild sturgeon species occupy rivers, lakes, estuaries and coastal waters depending on the species. Some remain in freshwater while others migrate between freshwater and the sea.
This variety is important to pond keepers because "sturgeon" is not one single fish with one adult size and one set of requirements. Always identify the exact species before buying one.
Can sturgeon live in a garden pond?
Yes, but only if the pond can provide enough space, excellent water quality and a high level of dissolved oxygen.
Sturgeon grow much larger than most goldfish and many other ornamental pond fish. As a practical starting point, guidance for ornamental pond keeping recommends a pond of around 10,000 litres for adult sturgeon and a depth greater than about 1.2 metres. This should be treated as a starting point rather than a guarantee that every species of sturgeon will be suitable for a pond of that size.
Some sturgeon species can eventually grow far beyond one metre in length. Before purchasing a juvenile fish, find out its scientific or common species name and research its realistic adult size.
A sturgeon should never be bought with the assumption that it can simply be moved to a larger pond later if it outgrows the existing one.
What does a sturgeon pond need?
A suitable sturgeon pond needs more than a large volume of water. These fish depend on good circulation, efficient filtration and abundant dissolved oxygen.
- Enough swimming space. The pond must accommodate the adult size of the particular sturgeon species, not simply the juvenile fish being purchased.
- Good depth. A deeper pond provides more stable water temperatures and gives the fish access to cooler water during warm weather.
- Excellent oxygenation. Sturgeon have a high requirement for dissolved oxygen. Aeration and good water movement are therefore particularly important.
- A mature biological filter. Ammonia and nitrite should remain at zero under the normal fish and feeding load.
- Effective mechanical filtration. Large fish eating protein-rich diets can create a substantial waste load, which needs to be removed from the system.
- A clear swimming route. Dense submerged vegetation or other obstacles should not create areas where a long-bodied fish can become trapped.
- Some protection from excessive heat and sun. Sturgeon are generally better suited to cool, oxygen-rich water than to a shallow pond that becomes very warm in summer.
For more information about filtration capacity and pond circulation, see our guide to pond filters and filter setup.
Why is oxygen so important for sturgeon?
Dissolved oxygen is one of the most important considerations when keeping sturgeon. Their oxygen demand is relatively high, and warm weather makes the problem more difficult because warmer water holds less dissolved oxygen.
This means that a pond which appears perfectly adequate in spring can become much less suitable during a summer heatwave.
Good surface movement, correctly sized pumps and additional aeration can all help. A waterfall may contribute useful gas exchange, but a dedicated air pump and diffusers provide aeration independently of the waterfall and can be particularly valuable during warm weather.
Do not rely only on the appearance of the water. Clear water can still have poor oxygen levels or dangerous concentrations of ammonia or nitrite.
Sturgeon and warm summer weather
High water temperature deserves special attention. As temperature rises, sturgeon metabolism and oxygen demand can increase while the amount of oxygen the water can hold decreases.
During very warm conditions:
- increase aeration and water movement;
- make sure pumps and filters are operating correctly;
- avoid unnecessary handling or other stress;
- watch the fish closely for abnormal behaviour;
- reduce feeding if the fish are stressed or water temperature becomes excessive;
- provide shade where necessary to limit further heating.
The exact temperature tolerance varies between sturgeon species, so there is no single maximum temperature that should be applied to every sturgeon kept in a garden pond.
Can sturgeon live with goldfish?
Sturgeon and goldfish can sometimes be kept together successfully if the pond is large enough and the requirements of the sturgeon are met.
The main difficulty is not normally aggression between the species. It is that their feeding behaviour and husbandry requirements are different.
Goldfish are opportunistic feeders and may eat food intended for the sturgeon. Sturgeon feed primarily from the bottom and should receive a specialised sinking diet. The keeper therefore needs to make sure that the sturgeon actually receives enough food rather than simply adding pellets and assuming that it has eaten.
The pond also needs to be designed around the more demanding species. A pond that is perfectly adequate for a few goldfish may still be far too small, too warm or insufficiently oxygenated for a sturgeon.
Can sturgeon live with koi?
Sturgeon can also be kept in some koi ponds, particularly because large koi ponds often already have substantial filtration, circulation and water volume. However, a koi pond is not automatically suitable for sturgeon.
The adult size of the sturgeon, oxygen level, water temperature and feeding requirements still need to be considered separately.
Koi are enthusiastic feeders and may compete for sinking pellets, so observe feeding rather than assuming that food reaching the bottom belongs to the sturgeon.
What do sturgeon eat?
Wild sturgeon are primarily bottom feeders. Depending on the species and life stage, their natural diet can include worms, insect larvae, crustaceans, molluscs and other animals found on or close to the bottom. Some sturgeon species may also consume small fish.
Their barbels help locate food and the mouth projects downward to suck food from the substrate.
In a garden pond, the safest approach is to use a complete food specifically formulated for sturgeon rather than trying to reproduce a wild diet.
What should you feed pond sturgeon?
Commercial sturgeon feeds are normally high in protein and oil and are produced as sinking pellets. Sinking food is important because sturgeon naturally search for food near the bottom.
Choose a pellet size that the fish can comfortably eat. Juvenile sturgeon need smaller pellets than large adults.
Do not assume that the cheapest generic pond pellet provides an appropriate diet simply because the sturgeon will eat it. A complete sturgeon feed is formulated for their nutritional requirements.
How to make sure a sturgeon gets enough food
Competition from koi and goldfish can make feeding more difficult than it first appears.
A useful approach is to feed the other fish in one area and then place sinking sturgeon pellets in another area where you can observe the sturgeon finding them.
Watch the fish rather than judging the feeding regime only by the amount of food added to the pond. A healthy sturgeon should maintain good body condition. Progressive weight loss or a visibly thin body means something needs investigating.
Possible causes include competition for food, an unsuitable diet, poor water quality, disease or another health problem. A thin sturgeon should not automatically be assumed to have poor water quality without checking the other possibilities.
Do sturgeon hibernate?
Sturgeon should not be treated as though they enter the same winter feeding shutdown commonly associated with koi and goldfish.
Their activity and metabolism decrease as the water becomes colder, but pond sturgeon may continue to feed at temperatures at which koi feeding has been greatly reduced or stopped.
This means that a keeper should not simply stop feeding the sturgeon because the other pond fish are no longer being fed.
Should sturgeon be fed during winter?
Yes. Current ornamental fish husbandry guidance recommends that sturgeon continue to receive food throughout the year, including at lower water temperatures.
That does not mean adding large quantities of food to an icy pond regardless of the fish's behaviour. Offer suitable sinking sturgeon pellets in small amounts and make sure they are being eaten. Remove or avoid excess food that would otherwise decay in the pond.
As temperatures rise again in spring, increase feeding gradually in response to the activity and appetite of the fish.
Can sturgeon become trapped in pond plants?
Dense submerged vegetation can be a problem for sturgeon. Their long bodies and bottom-oriented swimming behaviour mean that a heavily overgrown pond can create obstacles that are unsuitable for them.
Keep clear routes through the pond and prevent submerged vegetation or other material from forming dense tangles.
Predator netting can still be useful over a pond, but it should be properly installed and kept taut rather than allowed to hang loose in the water.
Water quality for pond sturgeon
Sturgeon should only be introduced to a mature, stable pond with effective filtration.
Regularly monitor:
- ammonia;
- nitrite;
- nitrate;
- pH;
- water temperature;
- and, where possible, dissolved oxygen during demanding conditions.
Ammonia and nitrite should remain at zero in a properly functioning pond. Unexpected deterioration in water quality should be corrected before adding more fish.
A newly installed filter does not become biologically mature simply because water has been running through it. Never add a sturgeon to an uncycled pond. See our guide to cycling a new fish pond.
Signs that a sturgeon may be in trouble
- unusual or erratic swimming;
- persistent difficulty maintaining normal orientation;
- obvious respiratory distress;
- loss of appetite;
- progressive loss of body condition;
- skin, fin or gill abnormalities;
- behaviour that is clearly different from the fish's normal routine.
Sturgeon are naturally bottom-oriented fish, so simply seeing one swimming or resting near the bottom is not by itself evidence of poor water quality.
If the behaviour changes suddenly, test the water first. Ammonia, nitrite, oxygen and temperature problems can affect fish quickly.
If water quality is normal but the fish remains unwell, seek advice from an aquatic veterinarian or another suitably qualified fish-health professional.
Be careful with pond treatments and medications
Do not add medications, algae treatments or other pond chemicals simply because a fish appears unwell.
First identify the likely cause of the problem and check whether the product is approved and suitable for the species, pond volume and water conditions in which it will be used.
Some treatments can affect dissolved oxygen or biological filtration, making correct dosing and aeration particularly important in a pond containing sturgeon.
The old version of this guide advised avoiding particular chemicals completely. That is too simplistic: suitability depends on the active ingredient, dose, species, diagnosis and the authorised use of the product.
Do sturgeon eat other pond fish?
Sturgeon are primarily bottom-feeding animals rather than specialised predators that hunt adult koi or goldfish around the pond.
However, the natural diets of some sturgeon species can include small fish as well as bottom-dwelling invertebrates. Eggs, fry or very small fish therefore should not be assumed to be completely safe simply because the sturgeon is normally fed pellets.
If breeding koi or goldfish is important, provide a separate protected area for eggs and fry rather than relying on compatibility between adult fish.
Before buying a sturgeon for your pond
A sturgeon should be planned for in the same way as any other very large, long-lived animal rather than purchased simply because an attractive juvenile is available at an aquatic shop.
- Identify the exact species. Do not buy a fish labelled only as "sturgeon" without knowing what it will become as an adult.
- Check the realistic adult size. Make sure your pond can accommodate the fish permanently.
- Check the pond volume and depth. A pond designed primarily for small goldfish may be unsuitable.
- Review filtration and aeration. The system needs to handle the waste load while maintaining excellent oxygenation.
- Plan year-round feeding. Keep an appropriate sinking sturgeon food available even when the feeding regime for koi or goldfish changes in winter.
- Check local legal requirements. Sturgeon are conservation-sensitive species and rules concerning purchase, trade, transport or possession can depend on species and location. Buy only legally sourced fish from a reputable supplier.
Common mistakes when keeping sturgeon
- Buying a juvenile without checking its adult size. Different sturgeon species can have dramatically different space requirements.
- Keeping sturgeon in a small, shallow pond. Small ponds heat rapidly and provide limited swimming space.
- Underestimating oxygen demand. Warm weather can turn inadequate aeration into a serious problem.
- Adding sturgeon to a new pond. The biological filter should already be mature and water quality stable.
- Feeding ordinary floating pond food only. Sturgeon are bottom feeders and should receive an appropriate sinking diet.
- Assuming the sturgeon ate because food was added. Koi and goldfish may compete for the pellets.
- Stopping all food during winter. Sturgeon have different cold-weather feeding requirements from koi and goldfish.
- Diagnosing illness from one behaviour. Test the water and look at the complete condition of the fish rather than assuming that one swimming position identifies the problem.
Sturgeon pond FAQs
Can sturgeon live in a garden pond?
Yes, provided the pond is large and deep enough for the adult fish and has excellent filtration, circulation and oxygenation. Small ornamental ponds are generally unsuitable.
Can sturgeon live with goldfish?
They can be kept together in a suitable pond, but the pond must meet the more demanding space and oxygen requirements of the sturgeon. Feeding also needs to be managed so the goldfish do not consume the sturgeon's sinking food.
Can sturgeon live with koi?
Sturgeon can be kept with koi in sufficiently large, well-filtered and well-oxygenated ponds. The species and eventual size of the sturgeon still need to be considered before purchase.
What do sturgeon eat in ponds?
Pond sturgeon should normally be given a complete sinking food formulated specifically for sturgeon. Their natural diet is bottom-oriented and may include worms, insect larvae, crustaceans, molluscs and, in some species, small fish.
Do sturgeon hibernate?
No. Their metabolism and activity decrease in cold water, but pond sturgeon should not automatically be treated like koi that are no longer being fed during very cold conditions.
Do sturgeon need feeding in winter?
Yes. Sturgeon should continue to receive suitable food during winter, although the quantity should reflect their reduced activity and appetite. Use sinking sturgeon pellets and avoid leaving uneaten food in the pond.
Do sturgeon eat other fish?
Sturgeon are primarily bottom feeders, but the diet of some species can include small fish. Adult koi and goldfish are not their normal target, but eggs, fry and very small fish should not be assumed to be completely protected.
How big do pond sturgeon grow?
Adult size depends strongly on species. Sturgeon commonly sold for ponds can exceed one metre, while some sturgeon species can become much larger. This is why the exact species should always be identified before purchase.
Reader question
Hi,
I found your site and hope you can help me regarding pond sturgeon.
I live in Philadelphia, and have a 3-tiered pond, about 10,000 gallons or more, up to four feet deep.
I have not had success with sturgeon previously, as I think they were eaten by turtles in my lower pond, and birds in my upper ponds. I have a line on some bigger sturgeon (7" and 8"), and it is getting cold here, so the pond(s) are covered in netting and the turtles are hibernating at the bottom (and the other fish -- Koi, hi-fins, and golden orbs -- are quiet and not being fed), so I thought I might try again.
If I put them in now, as temperatures go down to the 30s and 40s (1-10 Celsius), and then lower as winter progresses, do you think they'll be OK? If so, how often should I feed them? And how much for how long?
I'm looking to get about half a dozen sturgeon.
Thanks for your help
-Steven Prusky
Updated answer (2026): If possible, I would still prefer to introduce new sturgeon during a period of moderate water temperatures rather than immediately before winter. That gives you time to observe the fish, confirm that they are feeding properly and identify any problems before the coldest part of the year.
The first thing I would check, however, is the exact species of sturgeon being offered. Different species have very different eventual sizes and temperature requirements. Six juvenile fish only 7 or 8 inches long can represent a very substantial adult fish load, so the present size of the fish should not be used to decide whether the pond will ultimately be large enough.
I would also not use the old advice that sturgeon simply stop eating altogether during winter. Sturgeon are cold-water fish and some species remain capable of feeding at temperatures at which koi have become much less active. The amount of food they require will fall as the water gets colder, but the correct feeding rate depends on the species, water temperature and activity of the individual fish.
Offer a suitable sinking sturgeon food in small quantities and watch to make sure the fish actually find and eat it. Do not continue adding food according to a fixed schedule if it is being left uneaten, as excess food will only deteriorate the water quality.
Before adding the fish I would make sure that ammonia and nitrite are zero, the biological filter is mature, circulation and aeration are reliable and the pond has adequate dissolved oxygen. Good oxygenation remains important during winter as well as summer.
Your previous losses are another reason to review predator protection before trying again. A larger juvenile is not automatically safe simply because it is several inches long, so any netting or other protection should be secure without creating something in which the sturgeon could become trapped.
Reader question
Will sturgeon eat the eggs or offspring of my koi?
How do you make sure the other fish do not eat the sturgeon's food in the winter or colder months that the koi should not eat. My koi would probably eat at any time of year even though it is bad for them.
Updated answer (2026): I would not regard koi eggs or very small fry as completely safe in a pond containing sturgeon. Sturgeon are primarily bottom feeders and commonly eat bottom-dwelling invertebrates, but the natural diet of some species can also include fish eggs and small fish. If breeding koi and retaining as many eggs and fry as possible is important, a separate protected spawning or nursery area is the safer approach.
Feeding is mainly a matter of making sure that the sturgeon actually receives its share. Use a suitable sinking sturgeon pellet and place it where you can observe the sturgeon finding it. Koi and goldfish may also take sinking food, so I would not rely on the assumption that cold water will always make the other fish inactive enough to leave the sturgeon food alone.
One practical method is to feed the other fish in a different part of the pond and then offer the sturgeon food separately. The important point is to observe the fish rather than simply measuring out a fixed amount of pellets and assuming that the sturgeon has eaten them.
During colder weather the sturgeon may require less food as its metabolism and activity decrease, but it should not automatically be starved simply because feeding to the koi has been reduced or stopped. Offer small quantities according to the sturgeon's activity and appetite and avoid leaving uneaten food in the pond.