A Coastal Resurgence Near Rio
Humpback whales are surfacing with increasing frequency off the coast of Rio de Janeiro. This surge in sightings marks a milestone in the species’ recovery, which has seen the population climb from around 2,000 to around 35,000 in approximately 40 years. As these marine mammals reclaim their migratory range, they are appearing in urbanized waters like Guanabara Bay, signaling a healthy, expanding population.
The Legacy of the 1985 Moratorium
The current rebound is anchored in the International Whaling Commission’s decision to pause commercial whaling. The moratorium, which took effect during the 1985/1986 season, proved vital. “It’s wonderful. It shows that the whales are making a recovery, are healthy and thriving, and hopefully they’ll continue to do so,” says Enrico Marcovaldi, co-founder of the Humpback Whale Project. By removing the primary threat to their survival, the IWC enabled the species to begin its steady climb back from the brink.
Mapping Migratory Expansion
Each year, humpbacks undertake a 2,500-mile (4,000-kilometer) journey from the Southern Ocean to the tropical waters of Brazil. Following routes learned from their mothers, the whales congregate in the region between June and November. While the Abrolhos Bank—a coral reef region spanning the coasts of Bahia and Espirito Santo—has long served as a primary destination, researchers are now looking further south. The Humpback Whale Project is currently conducting an expedition, running from June 26 to July 9, to study the humpback whales’ behavior, size and health, as well as identify their travel route, key gathering areas, and to measure how far offshore the whales pass.
Scientific Inquiry in Urban Waters
The expedition is focused on more than just counting pods. Biologist Pedro Fróes noted that the team is studying how whales are exploring the area. “They want to find out whether, in the future, it could become a place for them to rest, to mate, or to give birth to a calf,” Fróes said.
Regulating the Rise of Whale Tourism
As the whales return, the tourism industry has pivoted to meet the demand. Operators, including the Rio Ocean Club, have launched sailboat excursions into the region’s coastal waters. These trips are typically limited to groups of five to 10 people. Education remains a priority, with many operators having a biologist on board during excursions. According to Louise Raulais, the presence of these experts provides educational value, which helps foster public interest in marine conservation and habitat protection.
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