HomeFish encyclopediaRay-finned fishesFlatfishesLefteye floundersWide-mouthed flounder Wide-mouthed flounder (Kamoharaia megastoma) Scientific name: Kamoharaia megastoma Kamohara, 1936 The Wide-mouthed flounder (Kamoharaia megastoma) is a marine fish of the family Bothidae. Native range: Western Pacific, southern Japan and Taiwan to the Indo-Australian Archipelago. BiologyDorsal spines: 0; Dorsal soft rays: 109-112; Anal spines: 0; Anal soft rays: 84 - 86. Mouth extremely large, maxillary strongly protruding beyond the tip of the snout anteriorly, and extending far beyond lower eye posteriorly. Upper jaw with 3 to 4 pairs of larger teeth anteriorly, and lower jaw with 3 pairs of curved strong canines anteriorly. Pectoral fin dark.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameKamoharaia megastomaFamilyBothidae (Lefteye flounders)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length22.5EnvironmentMarine; bathydemersalClimateDeep-waterDistributionWestern Pacific: southern Japan and Taiwan to the Indo-Australian Archipelago.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: of no interestResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Assuming tmax>3) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026