Red mite and mites in ducks: how to recognise, prevent and control them
The poultry red mite (Dermanyssus gallinae) is a blood-feeding mite that feeds at night and hides in crevices during the day. In waterfowl it appears less often than in hens, but with indoor housing and re-used equipment it pays to know how to detect and remove it early.
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What is red mite and does it affect ducks?
The poultry red mite (Dermanyssus gallinae) is a tiny, blood-feeding mite that feeds on birds at night and hides in the cracks of walls, perches, nests and equipment during the day. It is the most troublesome external parasite in laying hens. In ducks and other waterfowl, red mite is less common: their oily, water-repellent plumage and constant access to water make feeding harder for the mite. That does not mean the problem is absent — mites and lice can appear in houses with perches, crevices and equipment previously used for hens. That is why solid prevention also makes sense in duck farming.
Why is the risk lower in ducks than in hens?
Ducks are waterfowl — their plumage is oiled and water-repellent, and the birds regularly use water and wet surroundings. Such conditions do not favour mites, which prefer dry, warm crevices and quiet feeding at night. Ducks also use perches less, and perches are a classic hiding place for red mite. In practice, a red mite infestation is typical of laying hens kept long-term in the same building, while in ducks it appears mainly where birds are housed indoors, in old buildings previously used for hens, or with equipment moved between species. Young birds and ducks kept without access to a range and water are most at risk.
How do red mite and mites harm the flock?
Mites feed on the birds’ blood. With heavier numbers the birds become restless, scratch and preen, sleep poorly and lose appetite. Constant bites cause itching and skin irritation and, in severe cases, anaemia — pale skin around the beak and legs, weakness, poorer condition and slower growth. In laying ducks, egg production can drop. Mites can also carry pathogens and worsen the health of a flock already weakened by another disease. You will find an overview of other symptoms in the duck diseases section and in the poultry symptom table.
How do you detect the presence of mites?
Red mite is active after dark, so it is easy to miss during the day. The best method is a night inspection of the house with a torch: look into the crevices of perches, battens, wall joints and equipment — you will see clusters of tiny mites and a grey-black deposit (droppings and moults). Simple traps help: a tube, a piece of corrugated cardboard or a rolled strip of tape placed near the birds’ resting places and checked in the morning. It is also worth examining the ducks’ plumage, especially under the wings and around the vent, for lice and skin irritation. We describe regular monitoring in more detail under poultry farm biosecurity.
Red mite, biosecurity and equipment
Mites and lice most often arrive on a farm from outside: with used equipment, transport crates, flocks introduced without quarantine, and wild birds. The parasites can survive a long time in empty houses, waiting for the next birds. That is why thorough cleaning and disinfection between flocks, checking equipment brought onto the farm and limiting wild-bird access are key. We describe the rules for vehicle entry and deliveries in the guide vehicle entry and deliveries and biosecurity.
How red mite and mites hit ducks
Each of these signals should prompt the farmer to carry out a night inspection of the house and to consult a veterinarian.
Restlessness and scratching
Ducks constantly preen, become nervous, sleep poorly and avoid resting places. The restlessness intensifies at night, when mites feed.
Itching and skin irritation
Constant bites cause itching, redness and scabs, most often where the skin is thinner. Birds may pull out feathers and damage the skin.
Pallor and anaemia
With a heavier infestation, birds lose blood. The skin around the beak and legs turns pale and the bird is weak — a sign of anaemia that requires a quick response.
Poorer condition and growth
Restlessness, poor sleep and blood loss translate into reduced appetite, slower growth and flock non-uniformity, especially in young birds.
Drop in egg production
In laying ducks, the stress and weakness caused by parasites can lower egg production and worsen egg quality. This is often the first noticeable signal of a problem.
Mites and deposit in crevices
Clusters of tiny mites and a grey-black deposit (droppings and moults) in the crevices of perches, battens and equipment are direct proof that red mite is present.
How to prevent mites and how to remove them
Effective action combines cleanliness, sealing hiding places, monitoring and products used only on the advice of a veterinarian.
Cleaning and disinfection between flocks
Thorough washing and disinfection of the empty house removes mites and their hiding places before a new flock arrives. This is the foundation of protection — more in the guide poultry farm biosecurity.
Sealing crevices and hiding places
Red mite hides in the gaps of perches, battens and joints. Repairing and sealing crevices, and simplifying the design of equipment, reduce the places where the parasite can survive.
Dry litter and good conditions
Dry, regularly refreshed litter and effective ventilation improve hygiene and bird condition. We describe the rules in the guide litter management; we cover environmental conditions under the housing requirements for ducks.
Monitoring and traps
Regular night inspections of crevices with a torch and simple traps (cardboard, tube, tape) allow mites to be detected early. An early response is far more effective and cheaper than fighting a large infestation.
Products only on the vet’s advice
Mechanical agents (diatomaceous earth, silica) and acaricides are used only on the advice of a veterinarian, observing the withdrawal period before slaughter or egg collection. Do not decide on the product or its use yourself — consult a veterinarian.
Equipment biosecurity and wild birds
Do not bring in used equipment without cleaning, check transport crates and limit wild-bird access. We describe the rules of movement on the farm in the guide vehicle entry and deliveries and biosecurity.
Frequently asked questions about red mite and mites in ducks
Can ducks get red mite?add
Yes, though less often than hens. Their oily, water-repellent plumage and access to water make life harder for mites. Red mite and lice appear in ducks mainly with indoor housing, in old buildings previously used for hens, or with re-used equipment. Young birds are most at risk.
How do you recognise red mite in ducks?add
Red mite feeds at night, so it is best to do a night inspection of the house with a torch and look into the crevices of perches, battens and equipment — you will see mites and a grey-black deposit. Simple traps checked in the morning help. It is also worth examining the birds’ plumage under the wings and around the vent.
What are the symptoms of a mite infestation?add
Restlessness and frequent preening, itching and skin irritation, pallor around the beak and legs (anaemia), poorer condition and slower growth, and in laying ducks a drop in egg production. The earlier you respond, the smaller the losses.
How do you control red mite in the house?add
The foundation is thorough cleaning and disinfection of the empty house between flocks and sealing the crevices where the parasite hides. As support, mechanical agents (diatomaceous earth, silica) and acaricides are used — only on the advice of a veterinarian and observing the withdrawal period.
Can I use an anti-mite product myself?add
Do not select or apply acaricides on your own. Many products require a withdrawal period before slaughter or egg collection, and incorrect use can expose the farmer to sanctions and harm the birds. Decide on the product and dose with a veterinarian.
How does DlaFerm.pl help with mites?add
DlaFerm.pl lets you keep digital treatment and withdrawal records — the required documentation for every use of an antiparasitic product. In the Flock Card you can also record observations, night inspections and preventive actions, so the data are always at hand during a veterinary inspection. More on documentation: treatment and drug withdrawal records.
Sources & resources
- linkMSD Veterinary Manual — External Parasites of Poultry (Dermanyssus gallinae)
- linkEFSA — Health and welfare of poultry: parasitic infestations
- linkChief Veterinary Inspectorate Poland — information for poultry farmers
- linkNational Veterinary Research Institute — PIWet (Puławy)
- linkWOAH — Animal welfare and biosecurity in poultry
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