HomeFish encyclopediaRay-finned fishesPerch-like fishRemorasSlender suckerfish Slender suckerfish (Phtheirichthys lineatus) Scientific name: Phtheirichthys lineatus Menzies, 1791 The Slender suckerfish (Phtheirichthys lineatus) is a marine fish of the family Echeneidae. BiologyDorsal spines (total): 0; Dorsal soft rays (total): 32-38; Anal spines: 0; Anal soft rays: 31 - 38. Bluish black above, white below; 3 stripes along sides (upper pale blue, middle black, lower silvery).Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific namePhtheirichthys lineatusFamilyEcheneidae (Remoras)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length76.0Depth range0–1 m (0–3 ft)EnvironmentMarine; pelagic-oceanic; oceanodromous; depth range 0 - 1 mClimateSubtropicalDistributionWorldwide in tropical and subtropical waters. Western Atlantic: South Carolina, USA and northern Gulf of Mexico to northern South America. Western Central Pacific: Guam.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Assuming Fec SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026