HomeFreshwater aquarium fishOther freshwater fishBay pipefish Bay pipefish (Syngnathus leptorhynchus) Scientific name: Syngnathus leptorhynchus Girard, 1854 The Bay pipefish (Syngnathus leptorhynchus) is a brackish-water fish of the family Syngnathidae. BiologyCommon in eelgrass of bays and estuaries, sometimes taken in shallow offshore waters. Feeds on crustaceans. Females larger than males (R.C. de Graaf, pers. Comm., 2001). Ovoviviparous. The male carries the eggs in a brood pouch which is found under the tail.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSyngnathus leptorhynchusFamilySyngnathidae (Pipefishes and seahorses)OrderSyngnathiformes (Pipefishes and Seahorses)ClassActinopterygii (Ray-finned fishes)Maximum length33EnvironmentMarine; brackish; demersalClimateSubtropicalDistributionEastern Pacific: Sitka, Alaska to southern Baja California in Mexico; the northern population ranges from Alaska to Monterey Bay, southern population from Morro Bay southward.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesAquarium: public aquariumsResilienceHigh, minimum population doubling time less than 15 months (tmax=2;) More other freshwater fishPumpkinseedLepomis gibbosusLined soleAchirus lineatusShort-tailed pipefishMicrophis brachyurus brachyurusFinescale tigerfishDatnioides microlepisFreshwater garfishXenentodon cancilaSouth American lungfishLepidosiren paradoxaSee all other freshwater fish SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026