Covariance measures the linear relationship between two variables. The covariance is similar to the correlation between two variables, however, they differ in the following ways: Correlation coefficients are standardized. Thus, a perfect linear relationship results in a coefficient of 1. The correlation measures both the strength and direction of the linear relationship between two variables.
The Largest True Goldfish Ever Caught. The largest true goldfish on record was measured at 5lbs (2.27 kilograms) and was caught by a 16 year old schoolboy in the UK. This blown-up goldfish was evidently a pet before it ended up into a lake.
Goldfish (Carassius auratus) are a species of domesticated fish. Goldfish belong to the carp family and were domesticated in China in the Tang Dynasty. They can reach up to 59 cm in size, and 3 kg in weight. However, most goldfish grow to only half that size.