Goldfish “cuddling” is often a sign of breeding behavior, where one fish closely follows or nudges another as part of mating ...

While a dominant male fish from northern Mexico mates with a female, a small fella bides his time in the offing. Suddenly, the little guy darts in ahead of Mr. Big and plants his seeds on freshly laid ...

Goldfish may seem peaceful, but they often eat their own eggs shortly after spawning. This video explains why this behavior ...