A fish-releasing activity takes place at the Yellow Sea Entertainment Park in Yantai, Shandong province, on June 8 to mark World Oceans Day. [Photo/JiaoDong.net]

Masses of fish were released during an activity at the Yellow Sea Entertainment Park in Yantai, Shandong province, on June 8 to mark World Oceans Day.

Sponsored by the Yantai Ocean and Fisheries Bureau and Huahai Insurance Company, the activity attracted more than 500 residents and volunteers, who helped release around 100,000 fingerlings into the Yellow Sea.

Children and volunteers were the main drivers of the release. One female participant surnamed Song said, "It is the second time for us to take part in the fish-release activity and two of my children feel happy. The activity can help them gain an awareness of protecting ocean resources."

A boy and his mother release fish at the Yantai Yellow Sea Entertainment Park to mark World Oceans Day in Yantai, Shandong province, on June 8, 2015. [Photo/JiaoDong.net]

Wang Hongliang, director of the Ocean and Fisheries Bureau, called for more enterprises and social groups to make joint efforts to better protect marine ecology.

The UN officially designated June 8th as the date of the annual World Oceans Day in December 2008.