The whale was diving sharply and corkscrewing his body in order to continue moving and reach the surface to breathe, the company said.
Entanglement in fishing nets kills nearly 308,000 whales and dolphins a year - that's a whopping 843 every day.
"The nature of chronic entanglement trauma is perhaps the worst form of animal welfare abuse known to man," Michael J. Moore, Ph.D., a marine biologist with the Woods Hole Oceanographic Institution, told The Dodo. It's likely that the net slowly cut off the flukes, "giving the major blood vessels that feed the fluke time to clot and heal as the damage got deeper," he said.
This isn't the first time a whale has been seen without flukes due to entanglement. In the 1990s, one flukeless gray whale was sighted over a span of nine years in the waters off the Baja Peninsula. Another was spotted in 2011, traveling a recorded 100 nautical miles in just nine days without a tail. And in 2012, a flukeless dolphin was spotted off the coast of Australia. The animal had adapted by swimming in a side-to-side motion like a shark to stay afloat.