Bag of Aquatic Science Sinking feed for sturgeon, on a white background

The four sizes of the Aquatic Science Sinking sinking feed range lined up on a white background

Close-up of the ventral mouth and barbels of a sturgeon, positioned under the rostrum and turned towards the bottom

Sturgeon searching for sinking pellets on the gravel at the bottom of a pond

Sturgeon and koi carp in the same pond, the koi in open water and the sturgeon hugging the bottom

Sinking feed for sturgeon and bottom-dwelling fish

8,90 €

Weight	Price	Price per kg	vs 0,5 Kg
0,5 Kg	8,90 €	17,80 €	—
2 kg	28,90 €	14,45 €	−19 %
5 Kg	59,90 €	11,98 €	−33 %
9,5 Kg	99,90 €	10,52 €	−41 %

2,96 € × 3 with no fees Klarna.

These sinking pellets of 4 to 5 mm feed sturgeon, barbel, tench and orfe, fish that look for their food on the bottom. Supplied in a resealable bag of 0.5 to 9.5 kg, they contain 47% crude protein, with fish meal as the first ingredient.

At an equal ration, this feed delivers more nitrogen to the filter than a maintenance feed: measuring ammonium becomes a useful habit as soon as you introduce it into a pond that is already heavily stocked.

Ref. ASSKM05·Fish food

Food format : M

Weight : 0,5 kg

0,5 Kg

9,5 Kg

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The summary

What you receive: a resealable bag of 0.5, 2, 5 or 9.5 kg, sinking pellets in a medium size, 4 to 5 mm.
What's in it: 47% crude protein, 13% fat, with fishmeal as the first ingredient.
Who it's for: sturgeon, barbel, tench and ide, the fish that feed at the bottom.
How to feed it: at the bottom, away from the koi, and preferably at dusk.
What else you'll need: a pond thermometer and a dissolved oxygen test.
How it arrives: parcel of 0.5 to 9.5 kg, to a pick-up point or to your door.

Pellets that sink quickly and stay intact on the bottom, where the sturgeon feeds

The sturgeon looks for its food on the bottom. Its mouth is ventral and protractile, set beneath the rostrum, and it finds what it eats with its barbels. It rarely rises to the surface, and food that floats almost always escapes it. These 4 to 5 mm pellets sink to the bottom, where it finds them.

🐟 A pellet that sinks and holds together

Two qualities matter equally here. The pellet sinks quickly, so it reaches the bottom before the surface fish can grab it. It then stays intact for several minutes, long enough for the sturgeon to locate it with its barbels. A pellet that breaks apart on the way down is no longer eaten: it disperses into fine particles that add to the load your filtration has to deal with. Your koi, on the other hand, feed at the surface, and that is the job of a floating feed such as the colour feed.

Feeding in a mixed pond

If your pond is shared, the sturgeon eats more slowly than the koi. It looks for its food at the bottom, and the koi snatch the feed before it gets there, so the meal seems to be over when the sturgeon has received nothing. A sturgeon deprived of its share loses weight with no visible sign at the surface. The remedy comes down to three steps: give its food at a different spot in the pond, at a different time, and preferably after keeping the koi busy with theirs.

🌙 Feeding time

Ideally, give the sturgeon its meal at the end of the day, in a quiet area and always in the same place, so that it learns its routine. Several small feeds are better than a single one, because it eats slowly and continuously, rooting about on the bottom with its four barbels. As you cannot see the bottom, the ration is adjusted according to the condition of the fish: a sturgeon that is filling out is well fed, whereas one that is getting thinner almost always signals that other fish are eating its share. Unlike koi, it does not truly go dormant over winter and carries on eating as long as the water stays above a few degrees, so this bag is also useful in the cold season, at a reduced ration and at the least cold times of day.

Measuring dissolved oxygen before warm nights

A sturgeon uses a lot of oxygen, and water at 26 °C holds less of it than water at 18 °C. A dissolved oxygen test taken early on a summer morning, when levels are at their lowest, tells you whether the aeration is sufficient before you increase the ration. With a floating thermometer read at the same time each day, you also know when to cut back on feeding, since the Siberian sturgeon's appetite drops off above 28 °C.

The same sack feeds the other cold-water bottom-dwelling fish, barbel, tench and ide, which forage at the same level as the sturgeon. The formula combines 47% protein and 13% fat, with fish meal as the first ingredient, a balance designed for carnivorous or detritivorous fish whose natural diet is based on bottom-dwelling invertebrates. The medium size, 4 to 5 mm, suits fish from 15 cm in length, which covers most garden pond sturgeon, while the koi in your pond keep their floating pellets.

💧 The protein and your filter

The amount of ammoniacal nitrogen a feed produces follows its protein content. 100 g of this feed given over the course of a day produces about 4.8 g of ammoniacal nitrogen, expressed as NH4 as read by the test, compared with 3.4 g for a maintenance feed at 33.5%, which is 40% more for the same quantity fed. This order of magnitude is a maximum, because a planted pond takes up some of it before the filter. In aquaponics, this load is also what your plants feed on, which does not remove the need to measure it. Monitor the ammonium and then the nitrite in your water for the weeks following a change of feed, a mechanism described in the article on the nitrogen cycle.

🌊 The pond before the feed

Your sturgeon needs depth, at least 1.20 m, a volume in the region of 10,000 L per fish, and a clear bottom: the animal swims constantly and cannot reverse, so a planted bed or a cluttered decoration traps it. Then there is storing the bag: with 13% fat, this pellet oxidises quickly once the bag is open: reseal it after each feed, keep it dry and in the shade, and finish it within the season. The rest is detailed in the guide on the sturgeon in a garden pond, and the other formulas are in the pond fish food collection.

Technical specifications

Guaranteed analysis

Crude protein: 47%For the same ration, about 40% more ammoniacal nitrogen than a 33.5% feed.
Crude fat content: 13%An open bag oxidises quickly: reseal it and use it up within the season.
Crude fibre: 2.1%
Mineral matter: 10.9%
Calcium: 2.4%
Total phosphorus: 1.6%That is 1.8 times the phosphorus of a 0.9% feed, at an equal ration.

Use and packaging

Behaviour in the water: Sinking, fast-droppingIt reaches the bottom before the surface fish can snatch it.
Particle size: 4 to 5 mm, medium sizeA smaller pellet disperses before it reaches the bottom.
Minimum fish size: 15 cm
Target species: Sturgeon, barbel, tench, ide
Pond depth: 1.20 m at leastWith a clear bottom: the sturgeon swims constantly and cannot reverse.
Packaging: Resealable bag of 0.5, 2, 5 or 9.5 kg

Composition and additives

Ingredients, in the declared order: Fishmeal, cereals, oilseedsFish meal, cereal and oilseed products and by-products, fish oil, minerals.
Vitamin A (E672): min. 12,000 IU per kg
Vitamin E (3a700): min. 340 mg per kg
Vitamin C (3a312): min. 525 mg per kg

To budget for separately

Pond thermometer: 1 floating thermometer
Oxygen monitoring: 1 dissolved oxygen test

10 further specifications are available in the detailed view.

In the box

1 resealable bag of 0.5, 2, 5 or 9.5 kg of sinking pellets, medium size
1 manufacturer's label: composition, analysis, batch number and best-before date

Guaranteed analysis, additives, composition and target species taken on 5 September 2026 from the manufacturer's data sheet, Aquatic Science. Pond volume and depth are benchmarks from specialist sites, from 1,000 to 10,000 L per fish. Sizes of 0.5, 5 and 9.5 kg noted on 11/10/2026.

Which feed for a pond sturgeon?

Here, where the fish feeds is what decides: this sinking food, the other sinking one on the shelf, and the floating one that the koi in the same pond take.

A sinking feed, but which one? A sturgeon rarely swims up to the surface to feed. What remains to be seen is whether it shares the bottom with others, and how large it grows.

	Sinks to the bottom	Target species	Crude protein (%)	Crude fat content (%)	Ammoniacal nitrogen produced per 100 g fed, as NH4 (g)	Grain sizes available	Operating temperature	Bags available
Recommended Sinking, 4 to 5 mmYour choice	Yes	Sturgeon, barbel, tench, ide	47 %	13 %	4.8 g	4 to 5 mm	cold water	0.5 to 9.5 kg
JBL ProPond Goldfish, Sterlet and Biotope pond feedYour choice	Yes	Sturgeon	40 %	12 %	4.1 g	6 mm or 9 mm depending on the size	10 to 25 °C	1.65 kg or 3.3 kg
Pond fish food, floating pelletsYour choice	No	All pond fish	33.5 %	8.9 %	3.4 g	2 to 3, 4 to 5 or 6 to 7 mm	12 to 25 °C	0.5 to 10 kg

Sinking, 4 to 5 mmRecommended

Where the fish finds it

Sinks to the bottomYes

Target speciesSturgeon, barbel, tench, ide

The formula

Crude protein (%)47 %

Crude fat content (%)13 %

Ammoniacal nitrogen produced per 100 g fed, as NH4 (g)4.8 g

Use

Grain sizes available4 to 5 mm

Operating temperaturecold water

Bags available0.5 to 9.5 kg

JBL ProPond Goldfish, Sterlet and Biotope pond feed

Where the fish finds it

Sinks to the bottomYes

Target speciesSturgeon

The formula

Crude protein (%)40 %

Crude fat content (%)12 %

Ammoniacal nitrogen produced per 100 g fed, as NH4 (g)4.1 g

Use

Grain sizes available6 mm or 9 mm depending on the size

Operating temperature10 to 25 °C

Bags available1.65 kg or 3.3 kg

Pond fish food, floating pellets

Where the fish finds it

Sinks to the bottomNo

Target speciesAll pond fish

The formula

Crude protein (%)33.5 %

Crude fat content (%)8.9 %

Ammoniacal nitrogen produced per 100 g fed, as NH4 (g)3.4 g

Use

Grain sizes available2 to 3, 4 to 5 or 6 to 7 mm

Operating temperature12 to 25 °C

Bags available0.5 to 10 kg

Analyses taken on 5 September 2026 from the manufacturers' data sheets. Ammoniacal nitrogen estimated from the protein content, half of the nitrogen being assumed to be excreted, and expressed as NH4.

Documents & manuals

Official manufacturer's data sheet: analysis, composition and vitamins

The Aquatic Science page gives the guaranteed analysis, the composition, the vitamins and the pack sizes of the Sinking food.

PAGE · 4

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Bag of 0.5 to 9.5 kg, shipped to a pick-up point or to your home, as you choose during payment. The exact cost is calculated in the basket according to the total weight of your order.

Frequently asked questions

8 questions

6 key questions, 8 in the detailed view

How do you feed a sturgeon without the koi snatching everything before it?

The sturgeon's meal comes down to five steps:

Occupy the koi first, with their floating food, at a specific spot in the pond.
While they feed at the surface, scatter the sinking pellets at the opposite end, over a clear area of the bottom.
Use a PVC tube lowered to the bottom so the pellets sink without spreading out.
Move the sturgeon's meal to dusk: it hunts by smell and does not depend on light.
Allow plenty of time: where a koi swallows in a few seconds, the sturgeon takes several minutes to locate and then eat.

How much should you give, and how quickly should it be eaten?

The 5-minute rule, which serves as a guide for floating foods, does not hold here: you cannot see the bottom, so you cannot see what is left.

With a sinking food, the sensible approach is 2 to 3 very small meals a day rather than a single feed, and to add nothing until the previous meal has been followed by foraging behaviour on the bottom. A pond camera or simple observation at dawn will tell you more than a percentage.

At what water temperature should you space out a sturgeon's meals?

What size of pond is needed before taking in a sturgeon?

What you need	Guideline	Why
Volume per fish	10,000 L	A fish that swims continuously and grows fast
Depth	1.20 m	A cool, dark zone where it spends the day
Clear bottom	no decor	It cannot swim backwards

Dissolved oxygen is the first parameter to limit it, and water above 25 °C holds less: the oxygen test should be done in summer, before you touch the ration.

Is the 4 to 5 mm pellet suitable for my sturgeon?

Can a floating feed suit a sturgeon?

My sturgeon stays motionless on the bottom and has stopped eating, is it serious?

Two situations are possible, and they call for different responses.

The water has cooled: a drop in feeding, then a complete stop, is a normal signal in a cold-blooded fish, well before its critical temperature. You space the feeds out, cut back, and do not push it.

The water is warm and the fish is lethargic: that is something else. Water above 25 °C holds less oxygen, and the sturgeon is sensitive to this. Measure the dissolved oxygen before touching the ration, and read the guide on the sturgeon in a garden pond.

Is fish meal really the first ingredient?

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Sinking feed for sturgeon and bottom-dwelling fish

The summary