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Undergraduate Special Problem

Permanent URI for this collectionhttps://hdl.handle.net/20.500.14583/30

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Keyword: search.filters.keyword.Sea cucumbersSDG: search.filters.sdg.SDG 15 - Life on land

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    Epibiota of Holothuria scabra (Jaeger, 1833) from TINMAR, Southern Guimaras and Sagay Marine Reserve, Negros Occidental
    Calizar, Jessica Joyce D. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2013-04)
    The composition and abundance of epibiota on the sea cucumber Holothuria scabra collected in TINMAR, Southern Guimaras (Panay Gulf, northern Sulu Sea) and Sagay Marine Reserve, Negros Occidental (Visayan Sea), were determined. Epibiotic organisms on 10 Holothuria scabra individuals in each site were detached from the body surface with a fine brush dipped in alcohol. Samples collected were fixed in buffered formalin, followed by counting and identification under light microscopy. Sea cucumber epibionts consisted of photosynthetic protists, mainly diatoms (Phylum/Division Bacillariophyta), and small marine invertebrates (Protozoa, Mollusca, Arthropoda, and Annelida). Some 2,237 epibionts were counted with the diatoms as the most abundant and frequently encountered group. Epibiont species on Holothuria scabra were almost the same in both sites, except for annelids which was only encountered in samples from Sagay. Mean epibiotic abundance of Holothuria scabra from TINMAR was 61 per individual which was about a third of epibiotic abundance on individuals from Sagay (163 per individual). This study provides preliminary information on epibionts present on Philippine holothurians, and will help future researches in this field.
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    Community structure of holothuroids in selected seagrass beds in Taklong Island National Marine Reserve, Guimaras, Philippines
    Calaguing, Aldwyn C. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2018-06)
    Sea cucumbers are beneficial to mankind commercially as food and medicinal commodity. Overexploitation and illegal catch of these organisms even within Marine Protected Areas (MPAs) caused stock depleting and even local extinction of some populations in the country. Monitoring and regular assessment of their population is a must for their proper management and protection. This study investigated the status of holothuroid community within 4 selected seagrass meadows in Taklong Island National Marine Reserve (TINMR), Nueva Valencia, Guimaras. Holothuroid composition and estimates of density, frequency and distribution were determined through plot method. Species identification was based on gross morphology and spicule analysis. There were 40 individuals collected identified as 5 species, namely, Holothuria atra (n = 18), Holothuria pulla (n = 1), Holothuria scabra (n = 5), Bohadschia vitiensis (n = 2) and Synapta maculata (n = 13). The first 4 belonged to Order Aspidochirotida and the last belonged to Order Apodida. Their distribution and community structure in TINMR are likely influenced by the physical and chemical environment, seagrass community poaching, and cryptic behavior.
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    Survival and growth of juvenile sea cucumber Holothuria scabra Jaeger (1833) in shrimp pond sediment
    Briones, Jill D. (2012-03)
    Many high valued sea cucumbers e.g. Holothuria scabra are detritivores and thrive on organic matter and thus are potential bioremediating agents in eutrophic systems e.g. aquaculture ponds. Sea cucumbers cultured in shrimp ponds would act as natural bioremediators and lessen the organic matter content of the sediments hence make the pond environment more favorable for shrimp culture. This study looks at the feasibility of growing sea cucumbers in pond sediments for their bioremediating role and for their economic value. In this study, growth and survival of hatchery-produced H.scabra juveniles in Bare substrate (Treatment 1), Sand from natural habitat (Treatment 2) and Shrimp Pond sediment (Treatment 3) were compared after 5 weeks of culture. This study demonstrates that it is feasible to grow H. scabra juveniles in shrimp pond sediments without compromising their survival (p > 0.05). Results showed that those reared in Pond sediment grew best and significantly better compared to the other treatments (ANOVA, p<0.05). Juveniles grown in Pond sediment increased from mean weight of 3g to 14g while in the other treatments they just grew from mean of 2.7g to 8.7g. The consistently higher organic matter in Pond sediment could have contributed to better growth of sea cucumbers relative to other treatments. The bioremediating role of sea cucumbers was indicated by significant reduction in organic matter content in pond sediment by Week 5.