Trauma related to ship strikes in elephant seals
Vessel strike injuries refer to all physical injuries sustained by an elephant seal struck by a boat, propeller or boat hull. This phenomenon mainly concerns animals frequenting coastal areas where maritime traffic is dense, near resting, b...
What is it?
Vessel strike injuries refer to all physical injuries sustained by an elephant seal struck by a boat, propeller or boat hull. This phenomenon mainly concerns animals frequenting coastal areas where maritime traffic is dense, near resting, birthing or moulting beaches. The elephant seal, although an excellent swimmer, spends part of its time on the surface or close to the shore, which exposes it to this risk, particularly young, less experienced individuals.
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:
The signs observed depend on the severity and location of the shock.
We can see deep wounds, sometimes linear and regular, evoking the passage of a propeller, or more irregular lacerations due to a hull.
Fractures of the limbs, ribs or jaw are possible, leading to marked lameness or an inability to move normally.
The animal may present with localized swelling, pain on palpation, difficulty breathing if the rib cage is affected, or blood in the urine in the event of internal abdominal trauma.
In severe cases, the animal remains prostrate on the beach, refuses to move or return to the water, and shows general despondency.
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 direct cause is mechanical contact between the animal and a boat, its hull or its propeller. This occurs when the elephant seal is on the surface, in an area where boats pass, often near coasts frequented by fishing, tourism or pleasure traffic.
Coastal areas with high nautical use, particularly during periods of giving birth, moulting or feeding near the shore, increase the risk.
Young animals, less experienced in avoiding obstacles, as well as areas where shipping corridors intersect elephant seal resting sites, are particularly affected.
Low visibility, high speed of boats and a high density of maritime traffic also aggravate this risk.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The diagnosis is established by a veterinarian or a marine wildlife specialist, based on the clinical examination of the stranded or recovered animal, supplemented if possible by imaging (radiography, ultrasound) to assess the extent of fractures or internal lesions.
The history of discovery of the animal, the location and appearance of the wounds also point towards the traumatic origin of the injury.
Treatment
Treatment depends on the severity of the lesions. It may include wound care, antibiotic therapy to prevent infections, analgesics for pain, and in some cases surgery to stabilize fractures or treat internal injuries.
Support is provided by teams specializing in the rehabilitation of marine wildlife, often in dedicated centers.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Prevention is essentially based on maritime traffic management measures: speed limitation in areas known to be present with elephant seals, creation of protection or exclusion zones around breeding and moulting sites, awareness raising among boaters and fishermen.
Population monitoring and marking of sensitive areas also help to reduce collisions.
Possible complications
Possible complications include wound infection, internal bleeding, damage to vital organs in the event of chest or abdominal trauma, orthopedic after-effects lastingly limiting mobility, and in the most serious cases, death of the animal on site or after stranding.
When to see a veterinarian
Discovery of an elephant seal with suspicious deep or linear wounds
Animal unable to move normally or refusing to return to water
Signs of respiratory distress or visible bleeding
Significant swelling or deformity of a limb
Any stranding of an apparently injured or weakened individual
Prognosis
The prognosis varies greatly depending on the severity and location of the injuries. Superficial lesions can heal with appropriate management, while internal trauma or major fractures darken the prognosis. Rapid intervention by specialized teams improves the chances of survival and functional recovery.
Frequently asked questions
Are collisions with boats common among elephant seals?
They remain less documented than in other marine mammals such as manatees, but they are possible wherever maritime traffic crosses the resting or feeding areas of these animals.
What should I do if I find an injured elephant seal on a beach?
Do not approach or touch it. It is recommended to quickly contact the local wildlife protection authorities or a specialized center, which will dispatch a competent team.
Can an injured elephant seal heal on its own at sea?
Light injuries can heal naturally, but significant trauma requires veterinary care to avoid serious complications or death of the animal.
Is this type of trauma on the increase?
Increased maritime traffic in certain coastal areas is considered a growing risk factor for many marine mammals, potentially including elephant seals.
References
WOAH — Organisation mondiale de la santé animale (ex-OIE)
Content reviewed by the TunisieVet editorial team · Updated 18 August 2026
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