Chain pipefish (Syngnathus louisianae)

Classification (WoRMS)

Full classification as recorded by WoRMS: Kingdom: Animalia · Phylum: Chordata · Class: Teleostei · Order: Syngnathiformes · Family: Syngnathidae · Genus: Syngnathus.

Accepted name: Syngnathus louisianae · Authority: Günther, 1870 · Taxonomic status: accepted · AphiaID: 159453.

Source: World Register of Marine Species (WoRMS) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=159453 (CC BY 4.0). Accessed 2026-09-23.

Biology and life history (FishBase)

Measured values published by FishBase for Syngnathus louisianae. Only fields the database actually holds for this species are shown; these are database values, not aquarium guidance.

Maximum length: 38 cm · Depth range: 10–128 m · Habitat zone: reef-associated · Body shape: eel-like · Vulnerability index: 28 of 100.

FishBase notes: Ovoviviparous (Ref. 205). The male carries the eggs in a brood pouch which is found under the tail (Ref. 205). Feed mostly on amphipods and other small crustaceans (Ref. 27549).

Source: FishBase species summary (SpecCode 3304) — https://www.fishbase.se/summary/Syngnathus-louisianae.html (CC BY-NC 3.0 — non-commercial use only). Accessed 2026-09-23.

Distribution and occurrence records (GBIF)

9,446 georeferenced occurrence records for Syngnathus louisianae are published through GBIF from 7 countries or marine areas. The map above plots 41 distinct locations from a sample of 3,000 records, omitting 52 inland records that carry an institution's coordinates rather than a collection site; it shows where the species has been observed and reported, not a modelled range.

Most records by country or area: United States of America (9,365); Mexico (76); Bermuda (1); Canada (1); China (1).

The full country table, WoRMS marine regions and the sampling notes are on this species' Distribution page.

Source: GBIF Occurrence Search (taxonKey 2332958) — https://www.gbif.org/occurrence/search?taxon_key=2332958&has_coordinate=true (records CC0 / CC BY); WoRMS distribution records (MarineRegions) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=159453 (CC BY 4.0); Natural Earth 110m basemap — https://www.naturalearthdata.com/ (public domain). Accessed 2026-09-23.

Conservation status (IUCN Red List)

The IUCN Red List assesses Syngnathus louisianae Günther, 1870 as Data Deficient (code DD). No trend, population estimate or threat analysis is given here, because none is available from this source without the Red List API; follow the source link for the full assessment, including its date.

Source: IUCN Red List of Threatened Species (taxon 46109068) — https://www.iucnredlist.org/species/46109068/0; GBIF IUCN Red List category endpoint (taxonKey 2332958) — https://api.gbif.org/v1/species/2332958/iucnRedListCategory. Accessed 2026-09-23.

Description and natural history (Wikipedia)

The chain pipefish is a member of the family Sygnathidae. It is an elongate fish with the body encased in bony plates. They have a moderate-sized head, a rounded caudal fin, long snout and a small terminal mouth. The dorsal fin is moderate in length, the anal fin is greatly reduced, and the pelvic fins do not exist. The abdomen is flat or concave and may have a very small keel. The inferior trunk and tail ridges are not interrupted. Males have a brood pouch along the tail. There are 33-36 dorsal rays, 2 anal rays, 14 pectoral rays, 20 trunk rings, and 35-36 tail rings. The chain pipefish is one of the largest species of pipefishes in the western North Atlantic, with a maximum length of 381mm (15 in). The coloration of the chain pipefish, generally has a light colored background that is white to light brown. There is a dark brown stripe along the sides that extends onto the snout. There are lighter circular bands around the body between each body ring. The circular bands do not extend onto the ventral surface in the trunk area, but are visible along the tail. The anal, pectoral, and dorsal fins are generally unpigmented, but may have some scattered melanophores. The caudal fin is dusky.

Chain pipefish feed on small crustaceans, including shrimp, mysids, and amphipods.

Chain pipefish are common is sea grass beds or among the stems of marsh grasses and reeds near the shore along the Northern Gulf of Mexico. Juvenile chain pipefish also occur in surface water to at least 80 km offshore.

There is apparently no information on larval development, though larvae are initially retained within the male brood pouch. S. louisianae males give birth to live young from eggs transferred from the female to a specialized marsupium called a brood pouch. Unlike most seahorses, pipefishes of the genus Syngnathus incubate eggs in an inverted pouch. Fertilization occurs after the female transfers the eggs, and incubation lasts until embryos develop into juveniles. Based on the occurrence of brooding males and newly hatched larvae, reproduction occurs primarily during the spring and early summer (April – July), but continues through most months in Mississippi, except December and February. Brooding males are more commonly found offshore.

Fertilized eggs are small, ranging from 0.6 and 1.4 mm in diameter, and are arranged in one to two layers and up to 10 transverse rows.

Chain pipefish are distributed from New Jersey and Maryland south to along the Atlantic and the Gulf Shores. They are also found in Tabasco and Campeche, Mexico.

Source: Wikipedia: Chain pipefish — https://en.wikipedia.org/wiki/Chain_pipefish (CC BY-SA 4.0). Accessed 2026-09-23.