As there are over a hundred varieties of goldfish, coloration and physical characteristics vary greatly. Goldfish have exceptionally large eyes and acute senses of smell and hearing. They have 27-31 scales along their lateral lines. As pets, they should also be fed foods they would consume if they were in the wild. Reproduction Goldfish usually mature in their second year but this varies with diet, water temperature, and other environmental influences.
Males chase the females for several days before spawning occures.
Females can produce several thousand eggs per spawning period up to several times within a few months. Behavior Goldfish are omnivorous. In the wild they will school to a certain extent and increase quickly in number. In aquariums or bowls, however, they can be kept seperately. Goldfish are not particularly aggresive, thus combining sizes is not often a problem.