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Holothuria scabra, the sandfish or the golden sandfish
Anatomy and Morphology
[edit]The sandfish has the same basic anatomy as most other species of sea cucumber. Their bodies are elongated and cylindric, and relatively stubby. Their dorsal side can range in color from a grey-brown to black, with darkened wrinkles across the body and small black papillae from end to end. They are counter shaded with a lighter ventral side, which is relatively flat. They have a mouth located on the ventral surface at one end of the body, considered the front end. Like other sea cucumbers, they use feeding tentacles which protrude from the mouth. Sand fish have around 20 short tentacles. On the opposite end the anus is found on the dorsal side.[1] They can grow up to an average length of 22 cm with the largest reaching up to 40 cm, and reach maturity around 16 cm or 200 grams with some growing as much as 300 grams in one year.[1][2] It is unknown how long they live undisturbed, but they can live to at least 10 years.[1]
Their gonads are found through a single genital orifice on their dorsal anterior end. Their digestive system is made up of a mouth, an esophagus, a stomach, an intestine, a cloaca, and an anus. They extend respiratory trees from their cloaca in order to breath. Their body wall is think, making up a total of 56% of their weight.[1] This body wall is filled with calcareous plates call spicules, and are used to ID species; the sandfish is identified by table and knobbed button shapes.[1] Like other sea cucumbers, they can eviscerate their internal organs if they undergo stress, and can regenerate their organs; in sandfish this takes about 2 months.[1]
Life cycle
[edit]The sandfish goes through a 6 stages of growth before maturing into an adult. This starts when the adults spawn, after a day the fertilized eggs develop into its first planktonic phase, a gastrula, then after two days it becomes a auricularia, the feeding planktonic stage. Within the next 14 days the sandfish will enter a non-feeding doliolaria stage and a final planktonic pentactula stage, before becoming juveniles and settling into the sea grass meadows to mature.[1]
Ecology
[edit]Distribution
[edit]The species can be found in the Indo-Pacific region, from east Africa to the eastern Pacific. Some have been found in the Persian Gulf, Iran.[3] They are typically contained to latitudes between 30 N to 30 S, due to it being a tropical species.
Habitat
[edit]The sandfish inhabits shallow tropical waters, <20 m deep. They prefer seagrass meadows and muddy bottomed substrata with high nutrient levels due to their diet preference. They do have a tolerance for lowered salinity, down to 20 ppt, such as that found in brackish water.[1] Sandfish play a key role in the health of their habitat; like most sea cucumbers H. scabra are bioturbators and play a key roll in reworking the sediment and ensuring that organic matter is evenly distributed for the ecosystem to function, and have a subsequent diet of detritus and other microorganisms.[4][5][6]
Behavior
[edit]The sandfish exhibits some distinct behaviors. Their burrowing behavior varies as they mature, with younger sandfish responding to changes in light and coming out in darkness. Older sandfish are more sensitive to changes in temperature and will burrow to escape the cold. Sandfish are particular about sediment size and type, settling in fine sand and muddy substrates high in nutrients.[7] Like all sea cumbers, H. scabra exhibits defensive vomiting, where they expel their internal organs to distract predators while they escape. Male and females have distinct mating behaviors; when they spawn males erect their bodies and sway from side to side as they release sperm into the surrounding water. Shortly after, females will erect their bodies and send eggs into the water with the sperm in a short, forceful burst.[1][8]
Aquaculture
[edit]The sandfish has a high value in Asian markets where they are sold as beche-de-mer for food. This makes them a key species for aquaculture production, where the species flourishes; one of the only tropical holothurian species to do so.[9] They are also valuable in aquaculture for habitat restocking; juvenilles are often grown in tanks and released into the wild with hopes of restocking the wild population and causing a spillover effect in protected areas.[10] Broodstock is the population of adults that will be used for reproduction. These are gathered from wild stocks and since the sandfish is found in environments close to the equator, they can spawn year round. Peak season for spawning though is typically during the dry seasons, August to November.[11] Approximately 30-45 adult sandfish are required to start a small batch of spawning individuals.[1] Spawning for H. scabra is closely related to the lunar cycle, and will occur in the afternoon to early evening.[11] Spawning can be induced using several methods; thermal stimulation which involves increasing and decreasing water temperatures rapidly, dry treatment involves leaving the sandfish out of the water for 30-45 before being returned to the tanks, the water pressure treatment is the usage of a high powered jet of water to spray the sandfish to induce stress, and the food stimulant method involves providing a highly concentrated amount of algae to the water to overfeed the sandfish. Gonad extraction is also an option but requires the dissection of the animal. It is common in most aquaculture facilities to use a combination of the listed methods, in order to ensure spawning.[1] The sandfish larvae are closely monitored in order to ensure survival, as they are temperamental and require specific conditions for success. Once the larvae develop into juveniles they must be moved into growout tanks, at a density of 200-500 individuals per square meter to ensure that each one is receiving proper space to grow and the required nutrients.[12]
Cocultures
[edit]Due to it's hardy nature, the sandfish is a good species for cocultures with other species. They are able to reuse waste material from other organisms and make nutrients usable.[5] The following species have been kept in tanks with H. scabra:
- Black Tiger Prawn, Penaeus monodon[13][14]
- Red Seaweed, Kappaphycus striatum[15]
- Blue Shrimp, Litopenaeus stylirostris[16]
Conservation status
[edit]The sandfish is listed as an endangered with populations declining by the IUCN Red List. They face threats from over harvesting, but efforts are currently being taken around the Indo-Pacific including bans on the fishery and restocking via aquaculture efforts.[17]
References
[edit]- ^ a b c d e f g h i j k Agudo, Natacha (2006). Sandfish Hatchery Techniques. Nouméa, New Caledonia: Australian Centre for International Agricultural Research, Secretariat of the Pacific Community, and The WorldFish Center. ISBN 978-982-00-0175-6.
- ^ "FAO species identification guide for fishery purposes. The living marine resources of the Western Central Pacific. Volume 2. Cephalopods, crustaceans, holothurians and sharks". www.fao.org. Retrieved 2019-02-24.
- ^ Dabbagh, Abdul-Reza & Keshavarz, Musa & Mohammadikia, Dariush & Afkhami, Majid & Nateghi Shahrokni, Seyed Afshin. (2012). Holothuria scabra (Holothuroidea: Aspidochirotida): First record of a highly valued sea cucumber, in the Persian Gulf, Iran. Marine Biodiversity Records. 5. 10.1017/S1755267212000620.
- ^ Pitcher, Roland; Skewes, Timothy; Burridge, Charis; Uthicke, Sven; Wolkenhauer, Svea-Mara (March 2010). "The ecological role of Holothuria scabra (Echinodermata: Holothuroidea) within subtropical seagrass beds". Journal of the Marine Biological Association of the United Kingdom. 90 (2): 215–223. doi:10.1017/S0025315409990518. ISSN 1469-7769. S2CID 86038410.
- ^ a b "Rapid growth and bioturbation activity of the sea cucumber Holothuria scabra in earthen ponds". ResearchGate. Retrieved 2019-02-25.
- ^ Lee, Steven; Ford, Amanda K.; Mangubhai, Sangeeta; Wild, Christian; Ferse, Sebastian C.A. (2018-05-18). "Effects of sandfish (Holothuria scabra) removal on shallow-water sediments in Fiji". PeerJ. 6: e4773. doi:10.7717/peerj.4773. ISSN 2167-8359. PMC 5961627. PMID 29796344.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ^ Mercier, Annie; Battaglene, Stephen C.; Hamel, Jean-François (1 June 1999). "Daily burrowing cycle and feeding activity of juvenile sea cucumbers Holothuria scabra in response to environmental factors". Journal of Experimental Marine Biology and Ecology. 239, 1: 125–156. doi:10.1016/S0022-0981(99)00034-9 – via Elsevier Science Direct.
- ^ Morgan, Andrew David (1 January 2000). "Aspects of the reproductive cycle of the sea cucumber Holothuria scabra (Echinodermata: Holothuroidea)". www.ingentaconnect.com. Retrieved 2019-02-25.
- ^ Hamel, Jean-François; Conand, Chantal; Pawson, David L.; Mercier, Annie (2001), "The sea cucumber Holothuria scabra (Holothuroidea: Echinodermata): Its biology and exploitation as Beche-de-mer", Advances in Marine Biology, vol. 41, Elsevier, pp. 129–223, doi:10.1016/s0065-2881(01)41003-0, ISBN 9780120261413, retrieved 2019-02-25
- ^ Purcell, Steven W.; Kirby, David S. (August 2006). "Restocking the sea cucumber Holothuria scabra: Sizing no-take zones through individual-based movement modelling". Fisheries Research. 80 (1): 53–61. doi:10.1016/j.fishres.2006.03.020.
- ^ a b Battaglene, Stephen C; Seymour, J.Evizel; Ramofafia, Christian; Lane, Idris (30 April 2002). "Spawning induction of three tropical sea cucumbers, Holothuria scabra, H. fuscogilva and Actinopyga mauritiana". Aquaculture. 207 (1–2): 29–47. doi:10.1016/S0044-8486(01)00725-6.
- ^ James, D. B.; Gandhi, A. D.; Palaniswamy, N.; Rodrigo, Joseph Xavier (1994). "Hatchery Techniques and Culture of the Sea-cucumber Holothuria scabra". CMFRI Special Publication. 57: 1–40.
- ^ Watanabe, Satoshi; Kodama, Masashi; Zarate, Jacques M.; Lebata-Ramos, Maria J.H.; Nievales, Marie F.J. "Ability of sandfish (Holothuria scabra) to utilise organic matter in black tiger shrimp ponds". Asia–Pacific Tropical Sea Cucumber Aquaculture.
- ^ R. Pitt, N.D.Q. Duy, T.V. Duy, H.T.C. LongSandfish (Holothuria scabra) with shrimp (Penaeus monodon) co-culture tank trials Beche-de-mer (2004), pp. 12-22
- ^ Beltran-Gutierrez, Marisol; Ferse, Sebastian CA; Kunzmann, Andreas; Stead, Selina M; Msuya, Flower E; Hoffmeister, Thomas S; Slater, Matthew J (13 October 2014). "Co-culture of sea cucumber Holothuria scabra and red seaweed Kappaphycus striatum". Aquaculture Research. 47 (5): 1549–1559. doi:10.1111/are.12615.
- ^ Purcell, Steven W; Patrois, Jacques; Fraisse, Nicolas (23 February 2006). "Experimental evaluation of co-culture of juvenile sea cucumbers, Holothuria scabra (Jaeger), with juvenile blue shrimp, Litopenaeus stylirostris (Stimpson)". Aquaculture Research. 37 (5): 515–522. doi:10.1111/j.1365-2109.2006.01458.x. ISSN 1355-557X.
- ^ IUCN (2010-05-18). "Holothuria scabra: Hamel, J.-F., Mercier, A., Conand, C., Purcell, S., Toral-Granda, T.-G. & Gamboa, R.: The IUCN Red List of Threatened Species 2013: e.T180257A1606648". doi:10.2305/iucn.uk.2013-1.rlts.t180257a1606648.en.
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