This 28 July 2020 Dutch video is about a rare fish species, the allis shad.
It had been considered extinct in the Netherlands, because of pollution, overfishing, and human-made obstacles in rivers had stopped its migration from the North Sea up the river Rhine.
Recently, a small opening was made in the Haringvliet dam, to enable fish to travel up the Rhine.
This week, researchers discovered two adult allis shad fish in the Haringvliet.
Dear Kitty. Some blog 