When did the sperm whale population start declining?

Answer 1

The sperm whale population began declining significantly in the 18th century due to commercial whaling, which intensified during the 19th century as sperm whales were hunted for their oil, meat, and other products. By the early 20th century, overexploitation had led to substantial population reductions. Conservation efforts and international regulations have since been implemented, but the population has not fully recovered.