“Dolphin” Is the original name of this fish, however saying “dolphin” often mistakes people into thinking of the mammal dolphin. This fish is a rapid-swimming ocean dweller, often found under sargassum floats.. Easily Identified by the long continuous dorsal fin which extends from above the eye to the base of its tail. This fish is brilliant Silver; males display bright yellow, yellow green and blue iridescent spots. Females display brilliant blue iridescence with blue markings on the end.