|Scientific Name:||Hippocampus spinosissimus|
|Species Authority:||Weber, 1913|
Hippocampus aimei Roule, 1916
|Taxonomic Notes:||The 1996 and 2000 IUCN Red Lists included Hippocampus aimei, this is now considered a synonym of H. barbouri and H. spinosissimus. Genetics and morphometrics suggest that H. queenlandicus (Kuiter 2001) be recognized as a synonym of H. spinosissimus (P. Teska & S. Lourie, unpublished data). Commonly confused with H. histrix.|
|Red List Category & Criteria:||Vulnerable A2d+4d ver 3.1|
|Reviewer/s:||Morgan, S.K. & Foster, S.|
Hippocampus spinosissimus is listed as Vulnerable under criterion A based on suspected declines of at least 30% due to high levels of exploitation, most of which can be attributed to non-selective fishing practices. Hippocampus spinosissimus is one of the two seahorse species most often reported as being traded internationally, with an average of over 1.7 million individuals reported in trade per annum between 2004 and 2008 (Evanson et al. 2011).
The primary source for seahorses found in international trade have been landed as bycatch in non-target fisheries (Foster and Vincent 2004, Vincent et al. 2011) and this is true for H. spinosissimus (Vincent 1996, Giles et al. 2006, Morgan and Panes 2008, Perry et al. 2010, Evanson et al. 2011). Since 1995, H. spinosissimus was reported as one of the most abundant seahorse species caught as bycatch in trawl fisheries (Giles et al. 2006, Meuuwig et al. 2006, Perry et al. 2010).
|Range Description:||Hippocampus spinosissimus' range encompasses much of the Eastern Indian Ocean and the Western Pacific. Its range spreads from the East coast of India and Sri Lanka across to Taiwan and throughout Southeast Asia to Northern Australia (Lourie et al. 2004).|
Native:Australia; Cambodia; Indonesia; Malaysia; Myanmar; Philippines; Singapore; Sri Lanka; Taiwan, Province of China; Thailand; Viet Nam
|FAO Marine Fishing Areas:||
Indian Ocean – eastern; Indian Ocean – western; Pacific – northwest; Pacific – western central
|Range Map:||Click here to open the map viewer and explore range.|
Global population estimates for Hippocampus spinosissimus are currently unknown but analyses of trade and surveys conducted by Project Seahorse have shown that this species is widely traded for traditional medicine, the aquarium trade and for curios (Vincent 1996, Giles et al. 2006, Perry et al. 2010, Evanson et al. 2011). Evidence from fisher surveys indicated local declines in seahorse availability and catch, including H. spinosissimus, in the Philippines, Malaysia and Thailand and that the majority of H. spinosissimus are landed as bycatch (Morgan and Panes 2008, Perry et al. 2010). It can be suspected that comparable reductions are occurring throughout the species' range where the same threats are found (FAO 2001, Perry et al. 2010) .
The large reported volumes of H. spinosissimus in international trade indicates pressure on populations throughout its range. All Hippocampus species are listed under Appendix II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). This means that countries who are signatories to CITES are subject to regulations on the export of seahorses. Trade surveys and data reported to CITES indicate that H. spinosissimus is one of the species most reported as being traded internationally (Evanson et al. 2011). This trade has been occurring throughout its range from the mid 1990's to the present (Giles et al. 2006, Perry et al. 2010, Evanson et al. 2011, UNEP-WCMC 2012a,b).
Interviewees in the late 1990s in Malaysia and Thailand reported that seahorse availability had declined, including declines in H. spinosissimus (Perry et al. 2010). Targeted fishing in the central Philippines caused local declines of H. spinosissimus of over 80% over two months (Panes and Giles 2004). Fishers in the Philippines have reported high levels of decline in seahorse catches between 1970 and 2003 (O'Donnel et al. 2010). The fishers in the Philippines cited overfishing, the increasing population of fishers and indiscriminate catch of seahorses, including pregnant and immature seahorses, as causes of the observed decline in catch rates (O'Donnell et al. 2010).
Based on large volumes of reported trade as a result of bycatch in multiple fisheries throughout its range, it is suspected that there have been continuing declines of at least 30% in the past 10 to 15 years and that these declines are likely to continue into the future.
|Habitat and Ecology:||
Hippocampus spinosissimus are found in reef systems, occupying silt/sand bottoms (Lourie et al. 2004). In the central Philippines this species is most commonly found on relatively barren soft or sandy bottoms, in shallow depressions associated with octocorals, sea stars, sea pens, sea surchins, sponges, submerged wood and macroalgae but is seldom found on reefs or in association with hard corals (Morgan and Panes 2008). Malaysian trawls containing H. spinosissimus also captured similar substrates (Choo and Liew 2003). This species is often found at depths deeper than 8m with a maximum reported depth of 70m (Lourie et al. 2004, Morgan and Panes 2008).
All seahorse species have vital parental care, and many species studied to date have high site fidelity (Perante et al. 2002, Foster and Vincent 2004), highly structured social behaviour (Vincent and Sadler 1995), and relatively sparse distributions (Lourie et al. 1999)— these traits make seahorses vulnerable to over-exploitation. They also have some traits, such as small body size, fast growth and high fecundity, that may confer resilience to exploitation pressures (Morgan 2007). However a specialised life-history coupled with a dependence on shallow habitats that are subject to extremely high fishing pressure, and the fact that seahorses do not move very much and are thus easily captured, means they are very vulnerable to over-exploitation. The importance of life history parameters in determining response to exploitation has been demonstrated for a number of species, including seahorses (Jennings et al. 1998, Foster and Vincent 2004).
Hippocampus spinosissimus is threatened from bycatch in multiple artisinal and commercial fisheries throughout its range such as in Cambodia (cited in UNEP-WCMC 2012a), Malaysia and Thailand (Choo and Liew 2003, Perry et al. 2010), the Philippines (Panes and Giles 2004) and Vietnam (Giles et al. 2005). These fisheries are known to occur throughout much of H. spinosissimus' range and cause substantial damage to these habitats (FAO 2001, Giles et al. 2006, Perry et al. 2010).
Heavy trade in Hippocampus spinosissimus is recorded throughout its range and is one of the two most reported species in trade (UNEP-WCMC 2012a,b, Evanson et al. 2011). The large volumes of legal and illegal trade throughout this species' range are an indicator of high levels of exploitation pressure from bycatch exerted on this species.
Seahorses life history and ecological traits may increase their susceptibility to these threats (see Habitats and Ecology).
All Hippocampus species are listed under Appendix II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). This means that countries who are signatories to CITES are subject to regulations on the export of seahorses. Countries are required to provide permits for all exports of seahorses and are meant to provide evidence that these exports are not detrimental to wild populations. However a lack of basic information on distribution, habitat and abundance means many CITES Authorities cannot assess sustainability of their seahorse exploitation and meet their obligations to the Convention. The challenge is particularly large in that most seahorses entering trade are caught incidentally as bycatch and thus imposing export quotas would achieve next to nothing for wild populations.
CITES has recommended a minimum size limit of 10 cm height for all seahorse specimens in trade (CITES Decision 12.54). This limit represents a compromise between the best biological information available at the time of listing and perceived socio-economic feasibility. But we urgently need information on wild populations to assess their conservation status and take conservation action, as well as refine management recommendations. For example, evidence on variation in the spatial and temporal abundance of seahorses would enable areas of high seahorse density to be identified, as the basis for considering area restrictions on non-selective fishing gear that obtains Hippocampus species as bycatch. An understanding of the technical and logistical feasibility of returning to the sea live seahorses taken as bycatch in various types of fishing gear would provide the basis for considering the feasibility of minimum size limits and/or other output controls. Establishing monitoring program of landings of seahorses at representative sites, taking into account different gear types and means of extraction and recording catch and effort metrics would allow us to assess population conservation status and development management recommendations for various fishery types.
|Citation:||Wiswedel, S. 2012. Hippocampus spinosissimus. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 16 April 2014.|
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