The Dolphin Plant pictured above is one of several different species or hybrids of Columnea in the Gesneriad Family (Gesneriaceae).
The genus Columnea is native the New World tropics, where in response to pollination by hummingbirds (Trochilidae), many species have evolved curved, flaring, tubular flowers, often in hues of red, orange, and yellow.
The name Goldfish Plant is best reserved for another genus of Gesneriad endemic to eastern Brazil: Nematanthus, in which the flowers often have a narrowly constricted entrance that bears a fanciful resemblance to the puckered mouth of a goldfish (Carassius auratus).
To add further confusion, many gardeners nowadays are more familiar with another Dolphin Plant, also known as String-of-Dolphins
(Senecio x peregrinus, or alternatively Curio x peregrinus), in the Daisy Family (Asteraceae), in which the succulent, lobed leaves of the plant bear a noticeable resemblance to a leaping dolphin (some Odontoceti, Cetacea).