Populations of blue whales and fin whales are rebounding in the southeastern Atlantic Ocean, according to new research published in the African Journal of Marine Science. Scientists analyzed more than 60 years of confirmed sightings and strandings from Namibia and South Africa's west coast and found a dramatic recent increase in encounters with both species.

The data reveals a striking pattern: 95% of all observations occurred since 2012, despite the dataset spanning back decades. While absolute numbers remain low, the upward trend represents a notable recovery milestone for species hunted to near extinction during the commercial whaling era, which ended more than 40 years ago.

Blue whales rank as the largest animals ever to exist, while fin whales are the second largest. Both species faced decimation from industrial whaling operations that removed hundreds of thousands of individuals from oceans worldwide. International protections implemented in 1966 for blue whales and 1986 for fin whales halted commercial hunting, though populations have recovered slowly.

The southeastern Atlantic recovery suggests conservation efforts are working in at least one region. The researchers compiled historical sighting records and stranding data, two established methods for tracking cetacean populations in areas where direct surveys prove difficult. The concentration of observations after 2012 likely reflects both genuine population increases and improved reporting systems, though researchers did not specify the breakdown between these factors.

The findings offer cautious optimism for whale conservation globally. Recovery remains incomplete, and populations in other ocean regions show varied progress. Some areas continue to report low encounter rates. The study demonstrates that eliminating direct hunting pressure allows these species to recolonize historical ranges, though recovery timelines span decades.

Scientists did not identify factors driving the recent acceleration in sightings. Improved ocean monitoring, shifting prey distributions, or natural population growth could all contribute. Further research into migration patterns and feeding ecology in the region would help clarify whether