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Olfactory
pertaining to the sense of smell

Operculum
bony covering of the gills; protects the delicate gills underneath.

Optic
having to so with the sense of sight

Osteichthyes
a class of fish with a skeleton comprised of bone and cartilage; bony fishes

Ovaries
reproductive organs of female fish, produces eggs (ova)

Oviducts
small tubes or ducts that carry the eggs from the ovaries to the exterior

Oviparous
term given to organisms that lay eggs from which the young later hatch; most bony fish are oviparous

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