The sighting featured an estimated 8 individuals, including two calves. The school was seen playing amidst the waves.
Ankara tends to create new crises every week with its neighbors, part of its militarist agenda and also to distract from financial troubles at home.
The talks between the two countries, which have no diplomatic ties and are technically in a state of ongoing war, will be mediated by the US and hosted by the United Nations.
The forum includes Egypt, Israel, Greece, Cyprus, Jordan, the Palestinian Authority and Italy.
Israel and Lebanon have a dispute over an 860 sq. km. area in the eastern Mediterranean Sea that includes several blocs rich in natural gas off the coasts of both countries.
Greece has been joined by NATO allies France and Italy in its military drills in the same area of the Mediterranean, while Turkey has also carried out naval exercises.