In case you are wondering, FIFA states that the optimal size of a soccer pitch is between 69,000 and 86,000 square feet. An American football field commonly measures around 57,564 square feet . Of course, if you want an exact measurement conversion for land acreage then this handy conversion tool will help you...
The comet goldfish is similar to the common goldfish types and is often mistaken for it, but the comet has a more slender body with more noticeable and elongated fins; especially the caudual fin, which is more than half to three-quater the size of its own body.
The butterfly-tail goldfish is called the jikin in Japan, and it is believed to have been bred from the wakin goldfish. Another name for this goldfish variety is the star -tail goldfish. The physical appearance of the butterfly-tail differs from the wakin in that the tail, which, when opened, forms a large x that resembles the shape of a butterfly when viewed from behind. The buttefly-tail is a relatively hardy goldfish, but they are harder to find in pet stores than other goldfish varieties.