Omble Chevalier, [567]

Omiodon, [611]

Omosudis, [611]

Oncorhynchus, [566]

Oneirodes, [719];

O. eschrichtii, [174]

Onus, [648];

coloration of larvae, [175]

Oozooid, [84], [91], [93]

Opah, [628], [164]