The red pipefish (Festucalex erythraeus) is a species of marine pipefish of the family Syngnathidae. It is found throughout the Indo-Pacific, from Mozambique and South Africa to Hawaii, Honshu (Japan), and New Caledonia. It lives among rubble and coral or rocky reefs at depths of 18–40 metres (59–131 ft), where they can grow to lengths of 10 centimetres (3.9 in). They are expected to feed on small crustaceans, such as gammarid shrimps, mysids, and harpacticoid copepods. This species is ovoviviparous, with males brooding eggs and giving birth to live young. Males may brood at lengths of around 5.5 centimetres (2.2 in). It is exported from Hawaii as part of the aquarium trade.
- Manning, C. & Pollom, R. (2017). "Festucalex erythraeus". The IUCN Red List of Threatened Species. 2017: e.T65367204A67624718. doi:10.2305/IUCN.UK.2017-3.RLTS.T65367204A67624718.en.
- Dawson, C.E. (1985). Indo-Pacific pipefishes (Red Sea to the Americas). The Gulf Coast Research Laboratory Ocean Springs, Mississippi, USA.
- Froese, Rainer and Pauly, Daniel, eds. (2018). "Festucalex erythraeus" in FishBase. February 2018 version.
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