Petroleum, a fossil fuel, supplies more energy to the world today than any other source. The United States is the world's leading consumer of petroleum; in 1994, Americans used 7,587,000 barrels of oil per day.
Frequently test for ammonia and nitrite (you want both to measure zero). A pH test is also handy to ensure your goldfish's water is not too alkaline or acidic. This can be purchased at any pet store. Do not modify the fish's water, however, unless it is significantly different from neutral.
However the fish were all different colors and sizes. There was one medium size fish which was gold like a gold fish. The smallest fish was shiny silver and about the size of a smelt it was dead. The largest fish was a grayish looking silver and it was dead. The one and only gold color fish was alive and swimming.