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More videos at www.sat1regional.de Helmut Schwarten from Bad Malente is a fish farmer. But when he gets the sea trout from the Kellersee, it is not to sell them. He milks the animals to get the valuable fish eggs. They are then fertilized with sperm. In this way, he wants to ensure that the sea trout become native to the Schwentine again in large numbers. In recent years, around 200,000 eggs have been fertilized in this way. The fertilization rate in this form is over 95 percent - in the wild it would be less than half that. After the act, the trout go back to the Kellersee, because the farmed fish are not intended for the dinner plate. The fertilized eggs are kept in a glass incubator for 100 days. Then they are released into the East Holstein lakes. However, it will be years before they can frolic there again in large numbers. But the wait will be worth it for fish lovers.