The mite that lives in the air sacs of Gouldian finches and canaries
Published by Planète Pets · managing editor: Clément Lacaille · how our guides are written
A bird breathing open-mouthed, clicking with every intake of air or losing its voice is often put down to a chill. In Gouldian finches and canaries, another cause exists: a mite that lives in the trachea and the air sacs, Sternostoma tracheacolum. Our other guidance is gathered in the bird care and grooming section.
Contents · 6 sections
A parasite of the deep airways, not of the skin
A study published in 1992 by Tidemann, McOrist, Woinarski and Freeland in the Journal of Wildlife Diseases examined 26 wild Gouldian finches caught in Australia: 62% of them were infested (see the study, doi 10.7589/0090-3558-28.1.80). Histology revealed bronchopneumonia and inflammation of the air sacs associated with the presence of the mites. That figure describes wild birds in 1992: it does not apply to a European aviary, and nobody has published a prevalence figure for France.
It travels on the head, and its cycle closes in six days
It is the work published in 1996 by Bell in Experimental and Applied Acarology that makes the subject actionable. The full cycle, from egg to adult, is completed in under six days — hence populations that build up fast. Above all, the stage that ensures dissemination is the unengorged adult female, and it is found on the feathers of the head, on the beak and in the nostrils. Direct transmission between birds in close contact is therefore plausible, and the author describes a potential for indirect transmission through water, perches and other shared surfaces. That last point remains a deduction drawn from the parasite’s behaviour and survival, not a transmission experiment: it is the weakest link in the chain.
Monitoring from 2013 to 2021 in a zoological collection
A study published in 2024 by Wooten, Witte, Sutherland-Smith and colleagues in the Journal of Zoo and Wildlife Medicine analysed 377 Gouldian finches between 2013 and 2021. Mortality linked to the mite was higher from May to October than during the wet season, with an incidence rate ratio of 1.697. Respiratory morbidity also rose with each year of the study. One point deserves stating without being distorted: monthly ivermectin prophylaxis did not significantly reduce morbidity or mortality — but the authors themselves note that only a small proportion of the population was being treated preventively. The result does not allow the conclusion that the molecule is ineffective. A study published in 2026 by Burke and colleagues in the Journal of Avian Medicine and Surgery supplies the logical follow-up: a preventive doramectin protocol there reduced mortality associated with the mite. The choice of molecule and protocol is a matter for the avian vet.
What these studies do not show
None of them provides a prevalence figure for pet birds in Europe. None demonstrates that cleaning drinkers and perches reduces the infestation rate: it is a measure consistent with the parasite’s biology, not a measured result. One useful contradiction is worth noting, and it is almost always mangled: the 1992 authors consider that this mite probably did not cause the decline of the wild Gouldian finch over the preceding twenty years, but add in the same sentence that it could hold back the species’ return to its former status. Neither guilty of the decline, nor in the clear for all that.
What this changes day to day
Three habits follow from these data. First, treat any persistent respiratory sign in a Gouldian or a canary as a parasitic lead to investigate, not just a chill. Second, genuinely isolate a newcomer, since the infesting stage travels on the head. Third, do not share drinkers and perches between groups while any doubt remains. Diagnosis and treatment are a matter for an avian vet. See our guide on quarantining a new bird and our article on the sneezing bird.
Frequently asked questions
Is this the same parasite as the red mite?
No. The red mite is a blood-feeding mite that lives in the cage environment and bites at night; this one lives inside the airways. See our article on red mites in birds.
Can a canary infect a budgie?
The parasite is described in several bird species, particularly estrildid finches and canaries. The studies cited do not test cross-transmission to budgies. Find all our guides on the bird hub.
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This guide is part of Planète Pets’s Birds universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.
