HomeFish encyclopediaRay-finned fishesPerch-like fishSea chubsGulf opal eye Gulf opal eye (Girella simplicidens) Scientific name: Girella simplicidens Osburn & Nichols, 1916 The Gulf opal eye (Girella simplicidens) is a marine fish of the family Kyphosidae. Native range: Eastern Central Pacific, Gulf of California. BiologyForms big schools in shallow rocky areas that are rich in algae. Feeds on algae and small invertebrates.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameGirella simplicidensFamilyKyphosidae (Sea chubs)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length46.0EnvironmentMarine; benthopelagicClimateSubtropicalDistributionEastern Central Pacific: Gulf of California.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026