It even killed a 50-year-old fish named Madonna, before it disappeared again, despite numerous attempts by staff to trap the animal.
Mackinnon says the garden staff have added steel plates to the park gates, deterring any other otters from getting inside.
The garden closed for a week during the height of the otter's destruction and the saga set off a storm on social media among those rooting for and against the otter.
Koi embody positive connotations for many Asian cultures, from good luck to abundance and perseverance, and a statement from the garden says the fish are often an important and symbolic part of classical Chinese gardens.
© 2019 Vancouver Courier