Holothuria

About: Holothuria is a research topic. Over the lifetime, 362 publications have been published within this topic receiving 4982 citations.

Experiment on fission stimulation of holothuria arta (holothuroidea, echinodermata): changing in body weight and morphology

Abstract: Experiment on Holothuria atra provided evidence that asexual reproduction by fission was possible to be stimulated at laboratory. The success of the experiment was determined based on the high survival of stimulated individuals that grew into intact. After being tightened, induced individuals divided into anterior- and posteriorend individuals. During regenerating into intact individuals, the body weight decreased to relatively minimum weight. Developing of new tentacles in posterior-end individuals and anal aperture in anterior-end individuals required 7-8 weeks after fission. These indicators may lead to anatomical recovery which may be a sign of feeding necessity.

Ecological potential and spread distribution pattern sea cucumber Holothuria scabra and Holothuria vagabunda at Tanjungkeramat waters in Pangkil Village Bintan Regency, Indonesia

Abstract: The aim of the study was to determine the ecological potential and pattern of the distribution of sea cucumbers in the waters of Tanjungkeramat, Pangkil Village, Teluk Bintan District, Bintan regency. This study uses a survey method, determining the area with a swap area method of 4 areas, measuring the area using a meter with a length and width of 100 x 50 m. The results of the study found 2 types. Sea cucumber from the subfamily namely Holothuriidae and Stichopodidae. The highest density of Holothuroidea species in area I is 46 individual/ha. The lowest density is in area IV which is 12 individual/ha. Sea cucumber density in Tanjungkeramat is still relatively good. The water conditions in Tanjungkeramat still meet the quality standards that support the life of sea cucumber. Distribution pattern in area I with Id value 0.69, area II with Id value 0.68, and area III with a value of 0.42 has an even distribution pattern, while the distribution pattern in area IV Id 1.00 has a random distribution pattern.

PROBABLE MORTALITY OF Holothuria (Halodeima) grisea (SELENKA, 1867) (ECHINODERMATA, HOLOTHUROIDEA) AFTER ACUTE IMPACT OF OIL SPILL IN THE NORTHEAST OF BRAZIL IN 2019:

Abstract: The Brazilian northeastern coast suffered in 2019 the greatest acute impact of oil in the country’s history, with all states in the region being affected by extra-heavy oil. Holothuria (Halodeima) grisea is a detritivorous holoturoid, which ingests sediment to feed, and can passively ingest oil from spills existing in the sediment. To investigate the occurrence of oil in the intestinal content of H. (H.) grisea, a N of 20 individuals was collected on the Salvador coast (BA) in October 2019 between the coordinates 12°57 ‘S / 38°20’ W. Of this total, 10 individuals were found dead in the environment and 10 collected alive, for comparison purposes. Of the individuals found dead, 40% were eviscerated (without intestines) and it was not possible to carry out content analysis. Of the 6 remaining dead individuals, 67% had oil in their intestinal contents. For the 10 live sea cucumbers collected, none was eviscerated and all had a full intestine, with oil being observed in the intestinal content of 1 specimen (10%). The χ2 test confirmed with α of 0.025 the possible relationship between oil and the mortality of H. (H.) grisea, demonstrating that the acute oil spill probably was lethal for this species on the northeastern coast of Brazil. Keywords: sea cucumber, hydrocarbons, PAHs.

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.

Densidad poblacional y estructura de talla del pepino de mar Holothuria (Halodeima) grisea (Aspidochirotida: Holothuriidae) en aguas someras del sur del golfo de Morrosquillo, Caribe Colombiano

Abstract: Density population and size structure of the sea cucumber Holothuria (Halodeima) grisea (Aspidochirotida: Holothuriidae) in shallow waters south of the gulf of Morrosquillo, Colombian Caribbean. Holothuria grisea, despite not being considered a commercial resource has been the subject of illegal extractions in Colombia, a fact that becomes more serious due to the empty of biological information of these organisms. For this reason the density population and size structure of H. grisea were evaluated in three sectors south of the gulf of Morrosquillo from April to November 2015. To this end, three circular transects were located each month in each sampling site covering an area of 300 m2, where individuals were counted and measured in situ. The average density of H. grisea in the study area was 0.4 ind m-2, with the highest values in the La Ahumadera (1.09 ± 0.11 ind m-2) and the lowest values in Banco de Arena (0.02 ± 0.004 ind m-2). The analysis of variance showed a significance in the values of density and size of H. grisea in the studied sectors. The species presented a unimodal distribution of sizes with an average size of 13.5 ± 0.9 cm with a minimum size of 2.5 and a maximum of 30 cm, intermediate sizes generally showed a higher representativeness throughout this study (77.2 %). The biological aspects presented in this paper are of great importance for the conservation of this species and corresponds to an advance in the knowledge of the Holothuroidea class in the Colombian Caribbean. Rev. Biol. Trop. 66(2): 776-787. Epub 2018 June 01.