Humpback whales have returned to the coasts of Rio de Janeiro to seek warm waters for their breeding season [1, 2].
This annual migration is a critical biological event for the species, as these waters provide the necessary environment for reproduction and the rearing of calves. The presence of the whales also serves as a visible indicator of the recovery of the species following decades of industrial hunting.
The whales arrive in the northeast region of the Brazilian coast between June and November [1]. They travel from their primary feeding grounds in the Antarctic Ocean to reach these warmer latitudes [1].
To reach the breeding grounds in Brazil, the whales travel approximately 4,000 km, or 2,500 miles [1]. This journey is part of a larger migratory pattern that ensures the survival of the calves, who require warmer temperatures than those found in the southern polar regions [1].
The stability of these populations is supported by international regulation. The International Whaling Commission decided to suspend commercial whaling in 1982, a measure that became effective starting with the 1985/1986 season [1].
Local observers in Rio de Janeiro said the whales have become an unexpected winter attraction along the city's coast [2]. The sightings typically peak during the window from June to November [1].
“Humpback whales have returned to the coasts of Rio de Janeiro to seek warm waters for their breeding season.”
The consistent return of humpback whales to the Brazilian coast demonstrates the long-term efficacy of the 1982 international ban on commercial whaling. By maintaining these migratory corridors between the Antarctic feeding grounds and the tropical breeding waters of Rio de Janeiro, the species can sustain its population growth and genetic diversity.
