Annual reproductive cycle of sea cucumber Holothuria (Halodeima) atra Jaeger (Holothuroidea : Aspidochirota) at Tuticorin, Southeast coast of India

Ram Mohan, M K (2001) Annual reproductive cycle of sea cucumber Holothuria (Halodeima) atra Jaeger (Holothuroidea : Aspidochirota) at Tuticorin, Southeast coast of India. PhD thesis, Central Institute of Fisheries Education, Versova.

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Abstract

Knowledge on population parameters is a pre-requisite for the rational management of holothurians. Infonnation on the various species is scarce despite their abundance and size, which qualify them as a significant component of the benthic macrofauna of lagoon and coral environments. The reproductive biology studies of sea cucumbers are of great importance in understanding the annual breeding season, recruitment panems and stock enhancement in the natural environment. Likewise, it also helps in establishing a hatchery system to produce seeds. Induced spawning could be achieved through thennal stimulation for seed production. This enhances importance of a species for mariculture activities, where adequate seed supply is an important criterion. Seasonal reproduction is a mode associated with the storage of gametes. followed by subsequent release in a mass spawn-Qut. It implies a non-random allocation of resources to reproductive activities in relation to environmental and biological inputs. Holorhuria arra is one of the commonest sea cucumbers in the tropical waters. It is well distributed in the Indo-West Pacific. Oriental and Australian regions. In India, it is reported from the Gulf of Kutchh, Bombay (Mumbai), Ramagiri , Goa. Karwar, Quilon, Vizhinjam , Kanyal.:urnari, Gulf of Mannar, Palk Bay, Madras (Chennai) , Visakhapamam, the Lakshadweep islands and the Andaman and Nicobar islands. This species occurs in shallow waters in good densities. In Tuticorin port region, about 5-8 specimens could be found in 10 sq. m. area. Many holothurians possess saponin-based toxin In their body. The degree of toxicity varies with each species. This toxin is found to inhibit bacterial and fungal action. When H. arra is handled in live condition. a red toxin known as holothurin, stains hand. Rao er at. (l985a and b;1991) states that the toxins of H. arra are of biomedical importance, since they exhibit anti-rumoural, anti-fertility and anti-cancerous properties. The toxins proved lethal for unwanted organisms in culture ponds during the experiments conducted by James (1986a). The significance of the toxins of H. arra in biomedical research enhances the potential commercial importance of the species. Many holothurian toxins are found to inhibit bacterial and fungal action.

Item Type:Thesis (PhD)
Supervisor(s):James, D B
Uncontrolled Keywords:Annual reproductive cycle; sea cucumber; Holothuria (Halodeima) atra; Holothuroidea; Aspidochirota; Tuticorin
Subjects:Echinoderms > Seacucumber
Theses
Divisions:CMFRI-Cochin > Fishery Environment
ID Code:7143
Deposited By:Geetha P Mrs
Deposited On:28 Jan 2011 12:31
Last Modified:21 Jan 2014 12:18

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