Gastrointestinal parasitism of the wandering albatross (roundworms)
Gastrointestinal parasitism by roundworms (nematodes) is a common condition in the wandering albatross, a large seabird of the sub-Antarctic regions. These parasites live in the stomach or intestine of the bird and feed at its expense. In y...
What is it?
Gastrointestinal parasitism by roundworms (nematodes) is a common condition in the wandering albatross, a large seabird of the sub-Antarctic regions. These parasites live in the stomach or intestine of the bird and feed at its expense. In young nestling albatrosses, a heavy load of worms can seriously weaken the nestling, particularly when it is already stressed by lack of food or bad weather.
Key point
In chicks already weakened by a lack of food resources, a high parasite load can be a significant mortality factor, especially in colonies subjected to significant environmental stress.
Commonly observed signs
These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.
Related signs — each one links to its page:
Parasitized birds often show progressive weight loss despite an appetite that may seem normal at first. The plumage becomes dull and less waterproof. The young in the nest grow slower than their peers. Regurgitation or abnormal stools may be observed, sometimes with visible worms. In severe cases, the bird becomes despondent, remains prostrate in the nest and becomes dehydrated.
In adults, infestation often goes unnoticed because the birds compensate by feeding more at sea, but chronic weakening can reduce their ability to fly long distances to feed their single chick.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
The disease is caused by nematodes (roundworms) which colonize the digestive tract, particularly the proventriculus and the intestine. The eggs or larvae are ingested by the bird when feeding at sea, often via fish, cephalopods or crustaceans which harbor larval stages of the parasite. Some cycles involve a marine intermediate host, which explains why albatrosses, large pelagic predators, are regularly exposed.
Chicks and young birds are more vulnerable because their immune systems are immature and they are entirely dependent on parental food intake. Nutritional stress, an overcrowded colony, harsh climatic conditions or poor availability of marine food increase susceptibility to these parasites. Nesting areas where bird density is high also promote environmental contamination.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
Diagnosis is based on examination of feces under a microscope for worm eggs (coproscopy), possibly supplemented by endoscopy or post-mortem examination in birds found dead. The veterinarian also assesses the bird's general condition, weight and hydration before any therapeutic decision.
Treatment
Treatment is based on the administration of antiparasitics belonging to the family of broad-spectrum dewormers, prescribed and adapted by a veterinarian specializing in wildlife. Nutritional support and rehydration may be necessary if marked weakening occurs. Field treatment on a free wild population remains exceptional and limited to birds cared for in care centers.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
In the wild, prevention is mainly based on the preservation of the marine ecosystem and nesting areas, limiting environmental stress on colonies. In a context of captive care or rehabilitation (rescue center), good hygiene of ponds and feeding areas, as well as regular parasite control by a veterinarian specializing in wildlife, makes it possible to limit parasitic loads.
Possible complications
A massive infestation left untreated can lead to digestive obstruction, severe malnutrition and death, particularly in already weakened chicks. Association with other pathogens or lack of food worsens the prognosis.
When to see a veterinarian
An albatross chick appears abnormally thin or is not growing normally.
The bird frequently regurgitates or has abnormal stools.
Worms are visible in the droppings.
The bird remains prostrate, dejected, without normal reaction to the nest.
Signs of dehydration or marked weakness in a bird found on the ground.
Prognosis
The prognosis is generally favorable in adults in good condition, the infestation often remaining moderate and well tolerated. In young or already weakened birds, the prognosis becomes reserved to poor if the infestation is massive or associated with a lack of food, mortality may occur in the absence of treatment.
Frequently asked questions
Are wild wandering albatrosses often infested with roundworms?
Yes, a light to moderate burden of digestive nematodes is common and generally well tolerated by healthy adult birds, as it is part of the natural ecology of these marine predators.
Can a wild albatross be treated for these worms?
In the field, it is rarely possible to intervene on free birds. The treatment mainly concerns birds collected in care or rehabilitation centers, under specialized veterinary supervision.
Can this parasite be transmitted to humans?
No, these nematodes are specific to the cycle of seabirds and their aquatic prey; they do not represent a known risk to humans.
How do you recognize a parasitized albatross chick?
The signs are not specific: slowed growth, dull plumage, progressive weight loss. Only a stool examination by a professional can confirm the presence of worms.
References
WOAH — Organisation mondiale de la santé animale (ex-OIE)
FAO — Organisation des Nations unies pour l'alimentation et l'agriculture
Content reviewed by the TunisieVet editorial team · Updated 03 September 2026
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