According to DFO, right whales spend a significant amount of time swimming under water, making it difficult to observe them from the air.

Six right whales have been found dead in the gulf since early June.

The Campobello Whale Rescue Team will be working from the Acadian Peninsula this week in order to quickly intervene when an entangled North Atlantic Right Whale is found.

The animal, whose identification number is 4440, is the "grandson" of Wart, a whale the organization had adopted.

There were 18 recorded North Atlantic right whale deaths in Canadian and U.S. waters last year.

There are believed to be fewer than 450 of the whales remaining and, of those, there are only about 100 breeding females.

Three rescue boats are on the water and a Department of Fisheries and Oceans aircraft is surveying from the sky but heavy fog is limiting their search areas.

The whale reportedly had lines wrapped around its head and took the rescue team more four hours to disentangle the whale calf. 

The "green light" for rescue groups to disentangle North Atlantic right whales in the Gulf of St. Lawrence has been put "on pause" since July.