In its gorgeous colours the opah surpasses even the dolphins, all the fins being of a bright scarlet.
The Cetacea, which frequent these southern waters, are represented by four species - two dolphins and the sperm and right whale - and the Phocidae by six species, one of which (Phoca lupina) differs but little from the common seal.
Sea-lions, seals and dolphins are a source of profit.
It is not unlikely that such changes have in past time occurred; and if so an explanation is afforded of the occurrence of allied forms of freshwater dolphins (Platanista) and of many other animals in the two rivers and in the Brahmaputra.
But the Zacynthians have a special sea god, half man, half fish, who dwells under the sea, rides on dolphins or in a car drawn by dolphins, and wields a trident.