The common goldfish is remarkably hardy, and it is the most commonly kept pet animal in the world. It ahs been kept as an ornamental fish for centuries, and graced the garden pools & aquariums of kings and emperors for a thousand years.
The goldfish is renowned for its spectacular red-gold colour, can grow to about 20cm in length, and live upto 10 years or more.
The body is protected by rows of overlapping scales that never increase in number, but increase in size as the fish grows. The circuli, or rings of growth, are well-spaced in summer when growth is rapid, but are laid down close together in winter and at other times of poor growth. The tightly-bunched circuli of winter tend to show up as distinct bands, or annuli, and it is these that indicate the years of a fish's life to a trained scale reader.
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