Persian Gulf Bryde's whales, these once common residents can still can be seen in deeper marginal seas such as Gulf of Aden, Israel coasts, and in the Strait of Hormuz. Other species such as the critically endangered Arabian humpback whale, (also historically common in Gulf of Aden and increasingly sighted in the Red Sea since 2006, including in the Gulf of Aqaba), omura's whale, minke whale, and orca also swim into the gulf, while many other large species such as blue whale, sei, and sperm whales were once migrants into the Gulf of Oman and off the coasts in deeper waters, and
Persian Gulf naming dispute naming the "Arabian Gulf as the Persian Gulf" is that the Red Sea was named Arabian Gulf back then, which "prevented the Arabian Gulf from being named as Arabian Gulf, and instead the name Persian Gulf became common". According to a book "Documents on the Persian Gulf's name" (pp 92–98), the United Nations Secretariat and its specialized agencies have requested its staff to use only "Persian Gulf" as a standard geographical designation. The United Nations Group of Experts on Geographical Names discussed the naming issue during its 23rd session, held in Vienna from 28 March to 4 April 2006. According