Live-action footage introduces several species of bony flatfish, including turbot, brill, sole, and plaice. These side-swimmers are shown camouflaging themselves on the ocean floor. The stingray provides a transition to the symmetrical cartilaginous fishes with gill slits. The cameras move to the washed-up remains of ray and dogfish eggs, each protected by a solid capsule promoting embryo development. Species statistics include: 850 varieties of cartilaginous fishes and 25,000 varieties of bony fishes, the later accounting for almost half of all vertebrate species.
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