Large marine mammals, such as blue whales and fin whales, may be recovering in the waters off Southern Africa, according to a recent study. The sightings of these marine mammals have increased in recent years, which may be a sign of recovery after they were nearly eliminated from the region by commercial whaling in the 20th century.
Historical Context
Scientists estimate that around 350,000 Antarctic blue whales (Balaenoptera musculus intermedia) and 725,000 fin whales (B. physalus quoyi) were killed in the Atlantic during the industrial whaling era from 1913-1978, driving both whales to near extinction.
A research team led by Bridget James of the University of Cape Town, South Africa, set out to assess if both subspecies are recovering in the Benguela ecosystem in the southeastern Atlantic. This region is a stretch of water between the west coasts of northern Angola, Namibia, and South Africa, where currents bring nutrients from lower ocean depths to the surface, producing rich blooms of krill, a marine crustacean that both whale subspecies eat.
Study Results
Between 1964 and March 2025, the team found 17 reports of blue whale sightings and one report of stranding in the region. They also recorded 76 fin whale sightings and six strandings. The blue whales were most often seen between late spring to summer (October-December) and autumn (March-April) in the Benguela ecosystem, while fin whales were seen year-round.
Although the number of sightings is still relatively low, 95% of them were recorded since 2012. James told Mongabay by email that the Benguela ecosystem is a migratory corridor between breeding and feeding grounds for the whales, and that...
Implications and Perspectives
The study results suggest that blue and fin whales may be recovering in the region, which is a positive sign for the conservation of these species. However, it is essential to note that the number of sightings is still low and that more research is needed to confirm the recovery trend.
Furthermore, it is crucial to continue protecting these species and their habitats, as well as promoting the conservation of the Benguela ecosystem, which is essential for the survival of these whales.
Conclusion
The sightings of blue and fin whales off Southern Africa suggest that these species may be recovering, which is a positive sign for conservation. However, it is essential to continue monitoring the situation and promoting the conservation of these species and their habitats.
Source / Reference: Mongabay