Each year,thousands of dolphins are caught in fishing nets around the world. Now, biologists at an aquarium in Canada are trying to find a way to keep threatened dolphins safe.

Biologists at the Vancouver Aquarium are keen to find out how to prevent dolphins from getting trapped in fishing nets and colliding with ocean debris.

Biologists at the Vancouver Aquarium are keen to find out how to prevent dolphins from getting trapped in fishing nets and colliding with ocean debris.

They say their study aims to discover whether dolphins can perceive fishing nets and why they swim into them.

Pacific White-Sided Dolphins at the Vancouver Aquarium are training to swim with their eyes covered.

The process takes a long time, as dolphins are initially uncomfortable with having foreign objects attached to them. By working slowly and rewarding the dolphins with fish, the animals ultimately grow comfortable navigating with their eyes covered.