Showing papers on "Holothuria published in 1994"

Breakthrough in induced breeding and rearing of the larvae and juveniles of holothuria (metriatyla) scabra jaeger at tuticorin

Abstract: Holothuria (Metriatyla) scabra the most valuable sea-cucumber at present from India, has been successfully induced to breed for the first time. The larvae have been reared through various stages till settlement by feeding with micro-algae. Details of various stages of larvae are given. The feeding and rearing of juveniles also are presented in this paper.

Some observations on the biology of the holothurian holothuria (metriatyla) scabra (jaeger)

Abstract: Some aspects on the biology of commercially most important holothuriam Holothuria (Metriatyla) acabra are presented. It subsists on the organic matter present in the mud or sand. An analysis of gut content revealed fine mud (75-125 ^), sand particles (250-500 p.), moUuscan shells, debris and bits of algae. This species spawns in June and October. By external examination and by taking sections of the gonads, five maturity stages such as immature, maturing, early mature, late mature and spent have been fixed. The characteristics of different stages of maturity are presented in detail.

Holothurian resources from india and their exploitation

Abstract: In the seas around India nearly 200 species of holothurians are known, of which about 75 species are from the shallow waters within 20 m depth. Of these, about 15 species are of commercial value. At present processing is restricted only to the Gulf of Mannar and Palk Bay on the mainland. Here Holothuria (Metriatyla) scabra is mainly used. The other species exploited are Holothuria (Thelothuria) spinifera and Bohadschia marmorata. Holothuria (Halodeima) atra which occurs in large numbers can also be tried. At present there is no exploitation in the Lakshadweep. In Lakshadweep, Holothuria (Microthele) nobilia which yields first grade beche-de-mer occurs in abundance followed by Bohadschia argus and Stichopus choloronotus. Exploitation is stopped in Andaman {md Nicobar Islands. Holothuria {Metriatyla) scabra and species ot Actinopyga are important from the Andaman and Nicobar Islands.

Reproduction in holothuria (mertensiothuria) leucospilota (brandt) from anjuna, goa

Abstract: Holothuria (Mertensiothuria) leucospilota spawns more than once in a year i.e. during the postmonsoon (October to January) and in monsoon periods (June to September). An increase in the gonad index is observed during September and December 1985 and again during April and May 1986. The macroscopic and microscopic features of gonads have been described. The tubules are found to be longer and narrower in males when compared to the females. The ripe oocytes measured upto 220 |i. The spiawning of Holothuria (Mertensiothuria) leucospilota appeared to be influenced by low temperature and salinity. The relationships between the gonad index, temperature and salinity are not significant during the study period.

2. systematics, biology, ecology and zoogeography of holothurlvns zoogeography and systematics of holothurians used for beche-de'mer in india

Abstract: Although holothurians have wide range of distribution in general, they are restricted to certain regions and also have localised distribution in some cases. Holothuria (Metriatyla) scabra is distributed in the Gulf of Mannar and Palk Bay and also at Andaman and Nicobar Islands, but not represented in the Lakshadweep. Holothuria (Theelothuria) spinifera has a localised distribution in the Gulf of Mannar and Palk Bay. Holothuria (Microthele) nobilis is abundant in the Lakshadweep, but absent in the Gulf of Mannar and Palk Bay. Species of Actinopyga occur in the Lakshadweep and the Andaman and Nicobar Islands, but not on the Indian side of the Gulf of Mannar and Palk Bay. Brief notes on the taxonomy of commercially important holothurians are given.

Systematics, biology, ecologyAnd zoogeography of holothurians: Ecology of commercially important Holothurians of India

Abstract: A knowledge of the ecology of holothurians is important for proper exploitation of the resource. Species like Holothuria (Metriatyla) scabra, Holothuria (Thelothuria) spinifera are distributed on sandy beds with algae in shallow waters. Species otActinopyga live among coral reefs, while species like Holothuria (Microthele) nobilis, Bohadschia argus, Stichopus choloronotus occur in the lagoons. Details on the concentrations of holothurians in different zones are described in detail.

A small-scale unit to process sand-fish holothuria (metriatyla) scabra

Abstract: This paper deals with the design, details of a small-scale unit to process Holothuria (Metriatyla) scabra in a fishing village to improve the quality and storage life of the product.