This linguistic confusion is why Americans call the Pennsylvania Dutch Dutch even though they're Germans. To review: this country is the Netherlands, its people are Dutch, they speak Dutch. There is no country called Holland, but there are provinces of North and South Holland.
In clean, uncrowded conditions in tanks or ponds, goldfish grow fast. They can grow to a few inches (1 to 4 inches) within the first year. It really depends on their genetics and living situation. It may take a year or two before they change color from brown to gold or whatever color their parents were.
Hatching and Raising Fry The goldfish eggs take up to a week to hatch, depending on temperature. At 50 to 60 degrees F, they may take up to one or even two weeks to hatch but at 75 degrees F, they may hatch in 4 to 5 days.atching and Raising Fry The goldfish eggs take up to a week to hatch, depending on temperature. At 50 to 60 degrees F, they may take up to one or even two weeks to hatch but at 75 degrees F, they may hatch in 4 to 5 days.