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The remora does not have a swim bladder.
The remora does not have a swim bladder. It was created with a sucking disc on the top of its head so that it can “hitch-hike” rides on other animals to get around the ocean. Without this ride providing swift movement of water over its gills, the remora would quickly perish. Clearly this design feature did not evolve over long periods of time.
CLASS: Actinopterygii (ray-finned fishes)
ORDER: Perciformes (perch-like fishes)
FAMILY: Echeneididae (remoras and sharksuckers)
GENUS/SPECIES: Remora remora
Size: 1–3 ft (30–90 cm)
Habitat: Worldwide in tropical and warm waters