Cosmocampus balli (Ball's pipefish) is a species of fish of the family Syngnathidae. It is endemic to Hawaii, with observations off Oahu and Kauai. It lives is shallow, protected coral reef or rocky habitats, where it can grow to lengths of 7 centimetres (2.8 in). Although little is known about its feeding habits, it is expected to consume small crustaceans, similar to other pipefishes. This species is ovoviviparous, with males carrying eggs and giving birth to live young. Males can brood at 4.5 centimetres (1.8 in). The specific name honours the American zoologist Stanley Crittenden Ball (1885-1956) in acknowledgement of his "interest in the fishes of Oceania".
- Pollom, R. (2016). "Cosmocampus balli (errata version published in 2017)". The IUCN Red List of Threatened Species. 2016: e.T65365349A115417503. doi:10.2305/IUCN.UK.2016-3.RLTS.T65365349A67619430.en.
- Dawson, C.E., 1985. Indo-Pacific pipefishes (Red Sea to the Americas). The Gulf Coast Research Laboratory Ocean Springs, Mississippi, USA.
- H.W. Fowler (1925). "Fishes of Guam, Hawaii, Samoa, and Tahiti". Bulletin of the Bernice P. Bishop Museum (22): 1–38. Retrieved 27 May 2018.
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