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...
TYPES OF GOLDFISH. There are over 100 types of goldfish! All of the goldfish breeds belong to one of two types. The two types are the ORDINARY goldfish and FANCY goldfish. Ordinary goldfish have only one tail, while fancy goldfish have two tails. The common goldfish is an ordinary goldfish. It has a narrow body, which makes it a fast swimmer.
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.