Tuesday 21 May
Denise’s pygmy seahorse (Hippocampus denise)
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Denise’s pygmy seahorse fact file
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Denise’s pygmy seahorse description
Denise’s pygmy seahorse (Hippocampus denise) is a master of camouflage, its orange colouration and body tubercles exactly matching the stems and polyps of its gorgonian sea fan hosts (4). This relatively delicate seahorse has a thin body, long neck, short snout, a very long, prehensile tail (4), and is one of the smallest of all seahorse species, typically measuring less than two centimetres in height (1). Although similar to the pygmy seahorse (Hippocampus bargibanti), Denise’s pygmy seahorse is more smooth-skinned, showing comparatively fewer and less developed tubercles (2). In addition, males and females show greater differences in body shape than in the pygmy seahorse, with the female having a relatively slender, elongate trunk, while that of the male is noticeably more rounded (4).
- Length: up to 24 mm (2)
Denise’s pygmy seahorse biology
Denise’s pygmy seahorse can often be observed during the daytime swimming across the surface of the sea fan on which it lives, and is generally more active than the pygmy seahorse (4).
Very little is known about the reproductive behaviour of this species, although pregnant individuals have been found in February, May and October, indicating that breeding may occur year-round. Unusually, it is males and not females which brood the young in seahorses. However, while in most species the fertilised eggs develop in a fully enclosed pouch on the underside of the tail, in Denise’s pygmy seahorse and pygmy seahorse males, embryos are housed within the trunk region, without a separate pouch structure. Sexual maturity in Denise’s pygmy seahorse occurs at just 13.3 millimetres in length (4).Top
Denise’s pygmy seahorse rangeTop
Denise’s pygmy seahorse habitat
Found only on gorgonian sea fans Annella reticulata, Muricella and Echinogorgia, Denise’s pygmy seahorse occurs at depths of between 13 and 90 metres (1).Top
Denise’s pygmy seahorse statusTop
Denise’s pygmy seahorse threats
There is currently insufficient data on the distribution and abundance of Denise’s pygmy seahorse, and major threats to the species remain unknown. However, its small size and attractive colouration make it possible that this seahorse could be collected for the aquarium trade (1).Top
Denise’s pygmy seahorse conservation
There are currently no conservation measures targeting Denise’s pygmy seahorse.Top
Find out more
For more information on this and other seahorse species see:
The Seahorse Trust:
This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact:
- The fusion of gametes (male and female reproductive cells) to produce an embryo, which grows into a new individual.
- Capable of grasping.
- Small wart-like or angular swellings.
IUCN Red List (January, 2007)
FishBase (January, 2007)
CITES (January, 2007)
Lourie, S.A.and Randall, J.E. (2003) A New Pygmy Seahorse, Hippocampus denise (Teleostei: Syngnathidae) from the Indo-Pacific. Zoological Studies, 42(2): 284-291. Available at:
Lourie, S.A., Foster, S.J., Cooper, E.W.T. and Vincent, A.C.J. (2004) A Guide to the Identification of Seahorses. Project Seahorse and TRAFFIC North America, Washington D.C. Available at:
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