|Scientific Name:||Syngnathoides biaculeatus (Bloch, 1785)|
Stigmatophora unicolor Castelnau, 1875
Sygnathoides biaculeatus (Bloch, 1785) [orth. error]
Syngnathoides blochii Bleeker, 1851
Syngnathus biaculeatus Bloch, 1785
Syngnathus tetragonus Thunberg, 1776
|Taxonomic Source(s):||Bloch, M.E. 1785. Naturgeschichte der ausländischen Fische. Berlin.|
|Red List Category & Criteria:||Least Concern ver 3.1|
|Contributor(s):||Bartnik, S., Morgan, S.K., Pogonoski, J., Pollard, D.A. & Paxton, J.R.|
Syngnathoides biaculeatus is a coastal pipefish species that inhabits seagrass and algae through much of the Indo-Pacific. To date there have been no range-wide population estimates. The species is known to be used heavily in traditional medicine trade, but methods of capture and levels of offtake are unknown. Although further research is needed in order to determine how trade in this species is affecting wild populations, they are known to be relatively productive, are possibly resilient to fishing pressure, and local studies in some areas have shown population stability. Therefore S. biaculeatus is listed as Least Concern.
|Previously published Red List assessments:|
Syngnathoides biaculeatus has a wide geographic range. It has been recorded in surveys and taxonomic overviews from the Red Sea and the African east coast to Knysna, South Africa (Dawson 1985, Dawson 1986). It is also found in the Indo-Pacific from the east coast of India, throughout the South China Sea and has been recorded as far northward as northern Japan and Korea (Kim et al. 2013). It has been found in three states and one territory in Australia: Western Australia, the Northern Territory, Queensland, and New South Wales (Paxton et al. 1989). It has been recorded near the islands of Micronesia and Samoa (Randall et al. 1997).
Museum Records Worldwide: in Australia, there are 106 specimens (standard length 100-288 mm), collected from a depth range of 0 to 5 m, ranging in geographical distribution from the Timor Sea, Northern Territory south-eastwards to Batemans Bay (35°44’S), New South Wales on the east coast of Australia, and from Ashmore Reef (12°13’S) southwards to Geraldton (28°46’S) on the west coast of Australia. Outside Australia there are specimens from the Andaman Islands, India, Malay Archipelago, Guam, Papua New Guinea and the Solomon Islands. Specimens were collected between circa 1879 and 1998 (Pogonoski et al. 2002).Other museum records are available from FishBase and the Ocean Biogeographic Information System (OBIS) and include specimens collected from Fiji, Singapore, Kenya, and Yemen (Froese and Pauly 2016, Ocean Biogeographic Information System 2016). Specimens listed in Fishbase/OBIS have collection dates from 1828 to 2004.
Native:Australia (New South Wales, Northern Territory, Queensland, Western Australia); Egypt; Fiji; India; Indonesia; Japan; Madagascar; Marshall Islands; Micronesia, Federated States of ; Mozambique; Northern Mariana Islands; Papua New Guinea; Philippines; Samoa; Solomon Islands; South Africa; Sri Lanka; Taiwan, Province of China; Tonga
|FAO Marine Fishing Areas:|
Indian Ocean – eastern; Indian Ocean – western; Pacific – western central; Pacific – northwest; Pacific – southwest
|Range Map:||Click here to open the map viewer and explore range.|
To date there have been no range-wide population estimates for Syngnathoides biaculeatus. Local studies have been undertaken, such as the Takahashi et al. (2003) (and earlier thesis Takahashi 2000) report on index of population size (CPUE - ~0.2 fish per net) and seasonal changes in Moreton Bay, Queensland. Work in Bootless Bay, PNG found that they were very common (found at all seagrass sites) in moderate abundance (2-6 individuals/100 m²) with no systematic changes across the year (Barrows et al. 2009). Research is needed to determine overall population size and trends in abundance, but there are no indications of decline at this point.
|Current Population Trend:||Unknown|
|Habitat and Ecology:|
Syngnathoides biaculeatus is generally found in seagrass beds or algal flats in the protected shallow waters of lagoons and bays, its colouring matching plants well (Randall et al. 1997). Adults are found in large Sargassum rafts (Kuiter 1996) and juveniles are occasionally found among debris floating offshore (Dawson 1985). In Queensland, Australia, this species is found in estuaries, usually in association with Zostera seagrass, to which it anchors itself by means of its prehensile tail (Grant 1978).
Syngnathoides biaculeatus is ovoviviparous, and males brood the young beneath their trunk prior to giving live birth (Breder and Rosen 1966, Dawson 1985). They have a breeding season of between October and April in Moreton Bay, Australia (Takahashi et al. 2003) but year-round in Bootless Bay, PNG (Barrows et al. 2009). Males mature and can begin brooding at a length of about 180 mm (Dawson, 1985; Takahashi et al. 2003) although smaller mature males have been observed (Barrows et al.2009). Brood size for males was comparable to that of other syngnathids, at 60-350 eggs (Takahashi et al. 2003, Barrows et al. 2009).
Syngnathoides biaculeatus has been reported to achieve a maximum length of between 26 to 30 cm (Kuiter 1996, Takahashi et al. 2003) and displays significant size dimorphism, with males growing bigger than females (Takahashi et al. 2003). Although growth of S. biaculeatus has been reported as rapid over a life span of less than two years (Takahashi et al. 2003), more recent studies suggest that growth rates are slower and life spans can reach three years (Barrows et al. 2009).
|Use and Trade:||
Wild specimens have been dried and used in the Chinese traditional medicine trade for at least 600 years (Shi et al. 1993). They are traded live or dried (Vincent et al. 2011). Individuals are also kept and reared in public aquariums (Lange 1989, Koldewey 2005). Specimens are offered for sale to home/hobby aquarium owners through aquarium retailers (S. Bartnik, pers. obs.). It is not known from where specimens that supply either the traditional medicine trade or the aquarium trade originate, and thus levels of offtake are unknown.
This species is targeted by artisanal fishers and may be caught as bycatch in trawl fisheries (Vincent et al. 2011).
There are no species-specific conservation measures in place for Syngnathoides biaculeatus. The species occurs in several protected areas, including Australia's, Ashmore Reef National Nature Reserve, Cartier Island Marine Protected Area, the Great Barrier Reef Marine Park, and Coburg Marine Park (Pogonoski et al. 2002). It is not mentioned in any international legislation or trade regulations. In Australia, this species has been identified or protected along with other species by the following conservation actions:
|Citation:||Pollom, R. 2017. Syngnathoides biaculeatus. The IUCN Red List of Threatened Species 2017: e.T40715A67622796.Downloaded on 23 September 2017.|