Rounded Global Status Rank: G1 - Critically Imperiled

Reasons: Remnant populations occur in the North Atlantic; extremely low numbers; populations have failed to increase significantly even with protection; threats include collisions with boats, entanglement in fishing gear, disturbance by human activity, and general marine environmental deterioration.

Intrinsic Vulnerability: Highly vulnerable

Comments: Slow to mature, reproduces infrequently.

Other Considerations: Low reproductive rate; lack of recovery despite full protection.