Australostichopus

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Australasian sea cucumber
Australostichopus mollis P1222859.JPG
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Echinodermata
Class: Holothuroidea
Order: Synallactida
Family: Stichopodidae
Genus: Australostichopus
Levin in Moraes, Norhcote, Kalinin, Avilov, Silchenko & Dmitrenok, 2004
Species:
A. mollis
Binomial name
Australostichopus mollis
(Hutton, 1872)
Synonyms

(Species)

  • Holothuria mollis Hutton, 1872
  • Stichopus mollis (Hutton, 1872)
Australostichopus mollis at Bicheno, Tasmania Australostichopus mollis Southern sea cucumber P2143491.JPG
Australostichopus mollis at Bicheno, Tasmania

Australostichopus is a genus of sea cucumbers in the family Stichopodidae. It is monotypic, being represented by the single species Australostichopus mollis, [2] commonly known as the brown sea cucumber or Australasian sea cucumber. [3] This species has stimulated interest for its fishery potential in the Southern Hemisphere, [4] and for its capability to reduce waste produced by aquaculture. Despite its ecological role and abundance in New Zealand coastal waters, the scarcity of knowledge regarding A. mollis biology and ecology has hindered the development of a stable fishery industry. Importantly, A. mollis represents promising business potential within an important Asian market. [5] Recently its potential as a functional food has been evaluated, highlighting the nutritious components [6]

Contents

Distribution

In New Zealand, A. mollis is found around the entire coast line of the country, sometimes co-existing with reef structures; [7] and from New South Wales to south Western Australia. The species principally inhabits the littoral at low tide level on sand, as well as in mud in protected areas. Their vertical range goes from shallows waters on the coast to around 200 metres of depth. [8] [9]

Anatomy

Adult size is typically from 13 to 25 cm. [10] Body is soft, and colour varies from light mottled brown to black. A tube foot is present ventrally or extending up the whole body. Tentacles (20) with disc shaped tips surround the slit-like mouth. Retractor muscles are absent. Dorsally, A. mollis has pointed papillae which can be reduced on preservation. [7]

Feeding

Described as detritivores, A. mollis mainly capture particles of organic matter from the substrata, which is highly nutritious. [7] [11] [12] [13] [14]

Reproduction

Via sexual reproduction, and sexes are generally separate, however some hermaphrodites have been found. Population sex ratio is 1:1. [10] Reproductive season is from October to February, [15] and periodicity of spawning is regulated by lunar cycles, specifically following a full moon. [16] Morphologic changes in reproductive periods include females changes in gonad colour and oocyte numbers, while in males there is an increase in the amount of spermatozoa in particular zones described as "wet mounts of 'mashed' gonad tissue". [16] Furthermore, there is an increase in spermatozoa in the lumen of histological sections. Studies suggest that spawning may occur repeatedly during a single reproductive season. [16]

Auto-evisceration

Like other holothurians, A. mollis has the ability to regenerate its internal organs after undergoing a phenomenon called auto-evisceration. This process, which is thought to be induced by external stimuli, is characterized by violent and rapid expulsion of organs, followed by regeneration, which occurs at a slower rate than in other genera. [9] Nevertheless, a more recent study reports no spontaneous evisceration or seasonal atrophy of the viscera, highlighting that handling these organisms does not trigger such reactions and even suggesting than during predation it would not occur easily. [10] [17]

Predation

Available information posits the existence of just one predator: the starfish Luidia varia , observed in two cases. [10] To date there is no evidence to suggest any fish or other organism preying on A. mollis.

Juveniles

Juveniles are distributed in the shallow sub-tidal zone (5–8 m of depth), [10] relatively close to where adults are concentrated. However, they are usually found in a different substrata; one of smaller grain size, and associated to macroalgae as initial settlement, where they obtain detritus and protection from predators. These factors are thought to drive distribution, rather than and food type and availability. [7] Experimental data shows high survival rates of juveniles using a natural diet, and still higher rates in a mussel waste medium. [7] Thanks to attempts to produce juveniles in a commercial scale a better understanding of early post-settlement juveniles' growth and pigmentation process has been achieved [18]

Fishery

Processed sea cucumbers are traded under the name of beche-de-mer, representing an important fishery in South Pacific and Asian nations. [4] In New Zealand, where its exploitation occurs on a small-scale, [7] this species is under the New Zealand fisheries quota management system [7] and is principally caught by free-diving. [5] Sea cucumber yields can be very profitable if the resource is adequately processed, [7] or if a value-added policy is implemented. [7] Currently, due to the expansion of commercial exploitation of A. mollis in New Zealand and Australia, first attempts at massive culture are being carried out. [5] [7] A new approach to sea cucumber farming has been the so-called polyculture, where sea cucumber are bred together with mussels and finfish, consuming the wastes from nearby farming as a food supply, and at the same time providing new products. [5] Trials farming sea cucumber with abalone have shown not to be biologically viable. [7]

Larvae development

The complete larvae stage takes approximately 21 days. After fertilization there are seven stages of larva metamorphosis: cleavage, blastocyst, gastrulation, auricularia (subdivided in early, mid, late), doliolaria (mid metamorphic stage pre settlement), penttactula and the last settled sea cucumber larva, visible to the naked human eye, which develops into the final organism. [5] [19]

Polycultures

Considering the detritus-feeding characteristic of holothurians, and their role on coastal marine systems, [7] several studies have focussed on their grazing effect on sediments. These studies have calculated declines in total organic carbon and chlorophyll a and phaeopigment accumulation, positioning A. mollis as an effective tool to avoid, restore and control pollutive impacts of coastal bivalve aquaculture. [7]

In terms of evaluating the feasibility of polycultures, this has been evaluated in the field under Greenshell mussel [20] and Pacific oysters' farms. [21] In land based systems, according to the energetic requirements of adult sea cucumbers, results have inferred that waste production of an industry standard-type abalone lacks sufficient energy to meet A. mollis metabolic needs. However, there is suggestion that feeding juveniles from these wastes could be feasible. [22] Conversely, waste generation from fresh mussels have proven to be the source of enough energy to sustain juvenile stocks, assuming a suitable scale to ensure the supply. [7] Sea cucumbers also have been used as bioremediation units in scenarios of high organic waste pollution from farming, such as salmon. In this instance, this carbon source is transformed into body tissue; an example of efficiently using supplies and producing an alternative culture. [7]

Related Research Articles

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Sea cucumbers are echinoderms from the class Holothuroidea. They are marine animals with a leathery skin and an elongated body containing a single, branched gonad. They are found on the sea floor worldwide. The number of known holothurian species worldwide is about 1,786, with the greatest number being in the Asia-Pacific region. Many of these are gathered for human consumption and some species are cultivated in aquaculture systems. The harvested product is variously referred to as trepang, namako, bêche-de-mer, or balate. Sea cucumbers serve a useful role in the marine ecosystem as they help recycle nutrients, breaking down detritus and other organic matter, after which bacteria can continue the decomposition process.

<i>Jasus edwardsii</i> Species of crustacean

Jasus edwardsii, the southern rock lobster, red rock lobster, or spiny rock lobster, is a species of spiny lobster found throughout coastal waters of southern Australia and New Zealand including the Chatham Islands. It is commonly called crayfish in Australia and New Zealand and kōura in Māori. They resemble lobsters, but lack the large characteristic pincers on the first pair of walking legs.

<span class="mw-page-title-main">Stichopodidae</span> Family of sea cucumbers

The Stichopodidae are a family of sea cucumbers, part of the order Synallactida.

Evisceration is a method of autotomy involving the ejection of internal organs used by animals as a defensive strategy. Sea cucumbers (Holothuroidea) eject parts of the gut in order to scare and defend against potential predators such as crabs and fish. The organs are regenerated in a few days by cells in the interior of the sea cucumber.

<i>Isostichopus fuscus</i> Species of sea cucumber

Isostichopus fuscus, commonly known as the brown sea cucumber, is a species of sea cucumber in the family Stichopodidae native to the eastern Pacific. It was first described to science by German biologist Hubert Ludwig in 1875.

<span class="mw-page-title-main">Orange-footed sea cucumber</span> Species of sea cucumber

The orange-footed sea cucumber is the largest sea cucumber in New England, United States. It is one of the most abundant and widespread species of holothurians within the North Atlantic Ocean and the Barents Sea (Russia), being most abundant along the eastern coast of North America.

<i>Holothuria atra</i> Species of sea cucumber

Holothuria atra, commonly known as the black sea cucumber or lollyfish, is a species of marine invertebrate in the family Holothuriidae. It was placed in the subgenus Halodeima by Pearson in 1914, making its full scientific name Holothuria (Halodeima) atra. It is the type species of the subgenus.

<i>Enypniastes</i> Genus of sea cucumbers

Enypniastes is a genus of deep-sea sea cucumber. It is monotypic, being represented by the single species Enypniastes eximia. Due to its unique appearance, the species has been dubbed the headless chicken fish, headless chicken monster, and the Spanish dancer. It is also known as the swimming sea cucumber, and some are called the pink see-through fantasia.

<i>Holothuria mexicana</i> Species of sea cucumber

Holothuria mexicana, the donkey dung sea cucumber, is commonly found in the Caribbean and the Azores. It is a commercially important aspidochirote sea cucumber that can reach a total length of 50 cm (20 in).

<i>Holothuria scabra</i> Species of sea cucumber

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<i>Colochirus robustus</i> Species of echinoderm

Colochirus robustus, commonly known as the robust sea cucumber or the yellow sea cucumber, is a species of sea cucumber in the family Cucumariidae. It is found in shallow seas in tropical parts of the central Indo-Pacific region. C. robustus belongs to the class Holothuroidea, a group of echinoderms called sea cucumbers and known for unusual behavior including evisceration, asexual reproduction, and regeneration. The robust sea cucumber has a soft body and lacks a spine, but it does have an endoskeleton consisting of microscopic spicules, or ossicles, made of calcium carbonate. C. robustus has a respiratory tree that allows it to extract oxygen for respiration, using the anus to pump water. The robust sea cucumber is an important dietary staple for many East and Southeast Asian populations, and has been used for medicinal purposes for hundreds of years. Recent research suggests that peptides from C. robustus enhance the activity of the immune system.

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References

  1. ↑ Samyn, Y. (2013). "Australostichopus mollis". IUCN Red List of Threatened Species . 2013: e.T180332A1616401. doi: 10.2305/IUCN.UK.2013-1.RLTS.T180332A1616401.en . Retrieved 12 November 2021.
  2. ↑ Moraes,G., Norhcote, P.C., Kalinin,V.I. ,Avilov, S.A., Silchenko,A.S., Dmitrenok, P.S. 2004. Structure of the major triterpene glycoside from the sea cucumber Stichopus mollis and evidence to reclassify this species into the new genus Australostichopus. Biochemical Systematics and Ecology. 32 (7): 637–650.
  3. ↑ Zamora, L.N. and Jeffs, A.G., 2013. A review of the research on the Australasian sea cucumber, Australostichopus mollis (Echinodermata: Holothuroidea)(Hutton 1872), with emphasis on aquaculture. Journal of Shellfish Research, 32(3), pp.613–627.
  4. 1 2 Stenton-Dozey, J. and Heath, P. 2009. A first for New Zealand: culturing our endemic sea cucumber for overseas markets. Water & Atmosphere .17(1).
  5. 1 2 3 4 5 Morgan, A. & Archer, J. 1999. Overview: Aspects of sea cucumber industry research and development in the South Pacific. SPC Beche-de mer Information Bulletin. 12.
  6. ↑ Liu, F., Zamora, L., Jeffs, A. and Quek, S.Y., 2017. Biochemical composition of the Australasian sea cucumber, Australostichopus mollis, from a nutritional point of view. Nutrire, 42(1), p.12.
  7. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Slater, M.J. & Jeffs, A.G. 2010. Do benthic sediment characteristics explain the distribution of juveniles of the deposit-feeding sea cucumber Australostichopus mollis?. J. Sea Res. doi : 10.1016/j.seares.2010.03.005.
  8. ↑ Dawbin, W. H. 1950. A Guide to the Holothurians of New Zealand. Tuatara: Journal of the Biological Society. Vol. 3. Issue 1.
  9. 1 2 Dawbin, W.H. (1948a). Auto-evisceration and regeneration of the viscera in the holothurian Stichopus mollis (Hutton). Transactions of the Royal Society of New Zealand. 77(4): 497–523
  10. 1 2 3 4 5 Sewell, M.A. 1990. Aspects of the ecology of Stichopus mollis (Echinodermata: Holothuroidea) in north-eastern New Zealand. NZ J. Mar. Freshw. Res. 24: 97–103.
  11. ↑ Slater, M.J. & Carton, A. G. 2009. Effect of sea cucumber (Australostichopus mollis) grazing on coastal sediments impacted by mussel farm deposition. Marine Pollution Bulletin. 58: 1123–1129.
  12. ↑ Zamora, L.N. and Jeffs, A.G., 2011. Feeding, selection, digestion and absorption of the organic matter from mussel waste by juveniles of the deposit-feeding sea cucumber, Australostichopus mollis. Aquaculture, 317(1–4), pp.223–228.
  13. ↑ Zamora, L.N. and Jeffs, A.G., 2015. Macronutrient selection, absorption and energy budget of juveniles of the Australasian sea cucumber, Australostichopus mollis, feeding on mussel biodeposits at different temperatures. Aquaculture Nutrition, 21(2), pp.162–172.
  14. ↑ Zamora, L.N. and Jeffs, A.G., 2012. The ability of the deposit-feeding sea cucumber Australostichopus mollis to use natural variation in the biodeposits beneath mussel farms. Aquaculture, 326, pp.116–122.
  15. ↑ Sewell, M. A. and P. R. Berquist. 1990. Variability in the reproductive cycle of Stichopus mollis (Echinodermata:Holothuroidea). Invertebrate Reproduction and Development. 17(1):1–7.
  16. 1 2 3 Morgan, A. 2009. Spawning of the Temperate sea cucumber, Australostichopus mollis(Levin). Journal of the World Aquaculture Society. Vol. 40. No. 3.
  17. ↑ Zamora, L.N. and Jeffs, A.G., 2015. Evaluation of transportation methods of juveniles of the Australasian sea cucumber, Australostichopus mollis. Aquaculture research, 46(10), pp.2431–2442.
  18. ↑ Zamora, L.N., Maxwell, K.H. and Jeffs, A.G., 2017. Growth of Hatchery-reared Juveniles of the Australasian Sea Cucumber, Australostichopus mollis, Fed with Artificial and Natural Diets. Journal of the World Aquaculture Society, 48(4), pp.643–655.
  19. ↑ Morgan, A. 2009. Spawning of the Temperate Sea Cucumber, Australostichopus mollis (Levin). Journal of the World Aquaculture Society. Vol. 40. No. 3
  20. ↑ Slater, M.J. and Carton, A.G., 2007. Survivorship and growth of the sea cucumber Australostichopus (Stichopus) mollis (Hutton 1872) in polyculture trials with green-lipped mussel farms. Aquaculture, 272(1–4), pp.389–398.
  21. ↑ Zamora, L.N., Dollimore, J. and Jeffs, A.G., 2014. Feasibility of co-culture of the Australasian sea cucumber (Australostichopus mollis) with the Pacific oyster (Crassostrea gigas) in northern New Zealand. New Zealand Journal of Marine and Freshwater Research, 48(3), pp.394–404.
  22. ↑ Maxwell, K., Gardner, J.P.A., Heath, P., 2009. The effect of diet on the energy budget of the brown sea cucumber, Stichopus mollis (Hutton). J. World Aquac. Soc. 40: 159–170.
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