It’s unclear how the eels escaped, though Air Canada said they were quickly retrieved and repackaged.
They said they were in touch with the customer of the shipment about the incident.
Many took to social media to express their shock, their fears - and their endless supply of Snakes on a Plane memes.
One Giphy was shared more widely than others on X in response to the eel video: The scene where Neville Flynn, played by Samuel L Jackson in the 2006 movie, said: “Enough is enough! I’ve had it with these motherf***ing snakes on this motherf***ing plane! Everbody strap in”.
Another user commented: “New fear unlocked”.
There have been more reported incidents of snakes escaping at airports or on planes than eels.
Two months ago, airport security officers in Miami found a slithering surprise — a bag of snakes hidden in a passenger’s pants.
In May, travellers on an AirAsia flight from Bangkok to the resort island of Phuket were alarmed to spot something slithering through the overhead storage.
In December, a python fell from a plane arriving from Brisbane onto Queenstown Airport’s runway. According to the Otago Daily Times, the animal was later decapitated with a shovel.