The jumbo crustacean arrived for sale at an IGA store in Varennes, Que. east of Montreal.
An IGA supervisor, Yves Lalonde, contacted the Society for Friends of the Montreal Biodôme, hoping they would have a place for the huge specimen.
Christened 'Goliath' by IGA staff, the lobster is estimated to be between 35 and 50-years-old and will join 30 others living in the Biodôme's Gulf of St. Lawrence ecosystem.
According to a statement released by the Biodôme, the crustacean was caught off the coast of Nova Scotia and is an American lobster from the Northwest Atlantic.
At 48-centimetres in length, the lobster may be an impressive size, but the Biodôme has seen bigger.
An eight-kilogram lobster was donated to the facility in 2008 by a woman who won it in a Super Bowl contest. That lobster died a few years ago.
According to the Guiness World Records book, the biggest lobster was caught off Nova Scotia in 1977. It weighed more than 20 kilograms and was 106 centimeters long.
The newest resident of the Biodôme is in good health, according to staff, and could be enjoyed by visitors for many years to come.
According to Biodôme staff, lobsters can survive for up to 50 years.