HomeFish encyclopediaRay-finned fishesPipefishes and SeahorsesPipefishes and seahorsesOpossum pipefish Opossum pipefish (Microphis brachyurus lineatus) Scientific name: Microphis brachyurus lineatus Kaup, 1856 The Opossum pipefish (Microphis brachyurus lineatus) is a freshwater fish of the family Syngnathidae. Native range: Western Atlantic, New Jersey and eastern Florida (USA), Bahamas, Antilles, and from Veracruz, Mexico to Sao Paulo, Brazil. BiologyFound among floating Sargassum. Ovoviviparous. The male carries the eggs in a brood pouch which is found under the tailSource: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameMicrophis brachyurus lineatusFamilySyngnathidae (Pipefishes and seahorses)OrderSyngnathiformes (Pipefishes and Seahorses)ClassActinopterygii (Ray-finned fishes)Maximum length95.0EnvironmentMarine; freshwater; brackish; pelagic-neritic; oceanodromousClimateSubtropicalDistributionWestern Atlantic: New Jersey and eastern Florida (USA), Bahamas, Antilles, and from Veracruz, Mexico to Sao Paulo, Brazil.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceLow, minimum population doubling time 4.5 - 14 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