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UPV Theses and Dissertations

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Adviser: search.filters.advisor.Nievales, Marie Frances J.Keyword: search.filters.keyword.Growth

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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.
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    Effects of pH and salinity on growth and survival of juvenile sea cucumber Holothuria scabra (Jaeger, 1833)
    Abagat, Christian M. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2012-03)
    Sea cucumber aquaculture could provide a solution to both enhance declining wild sea cucumber populations through restocking and provide sufficient beche-de-mer product to satisfy the increasing Asian market demand. The growth and survival of hatchery-reared Holothuria scabra juveniles at different pH-salinity levels were investigated. Juveniles were exposed for 14 days in six pH-salinity levels: Trt 1 (pH 6.5 — 6.7, 26-28 %o), Trt 2 (pH 6.5 - 6.7, normal salinity), Trt 3 (pH 7.0 - 7.2, 26-28 %o), Trt 4 (pH 7.0 — 7.2, normal salinity), Trt 5 (normal pH, 26-28 %o) and Trt 6 (normal pH, normal salinity) as the control. Multivariate analysis of variance (MANOVA) with repeated measurements revealed that pH and salinity had a significant effect on growth (length, width, and weight) and survival of H. scabra juveniles. Slight seawater desalination combined with high acidification (pH: 6.5-6.7) had lethal effects on H. scabra juveniles. While H. scabra juveniles could be reared in seawater with pH ≥ 7.0- 7.2 and salinity ≥ 26-28 %o, ambient seawater conditions remained the most suitable in rearing H. scabra juveniles for optimum growth and survival.
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    Influence of sediments of varying grain size composition on growth, survival and burrowing activity of the Ball Sea cucumber, Phyllophorus proteus (Bell,1884) juveniles
    Amuenda, Jazriel Ann A. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2016-05)
    Phyllophorus proteus is a high-value sea cucumber species in Philippines but is also one of the most exploited. Hatchery-produced juveniles are used for stock enhancement as a means of restoring depleted population however biology of P. proteus have not yet been studied on. Burrowing incidence of ball sea cucumber P. proteus (Echinodermata: Holothuroidea) juveniles (4-5 length x ≤1mm width), growth, survival and their associated daily behaviour were compared in 3 different substrate collected from Sagay, Negros Occ. (A-mostly coarse), Panobolon, Guimaras (B-intermediate) and Carles, Iloilo (C-mostly fine). This was to establish the most suitable type of substrate to use in the culture system for this high-value sea cucumber. The highest incidence of burrowing was observed in sediment profile C but the difference in the mean number of burrowing individuals between treatments was statistically insignificant (p>0.05). After 4 weeks, growth of P. proteus juveniles was significantly higher (p<0.05) when reared on profile C (growth rate: 0.79±.13mm %d-l) than either profile B (p=0.009) (0.34±0.14 mm %d-1) or profile A (p=0.030) (0.21±0.11mm %d-1). Survival is highest in profile B (S=100%), intermediate in profile C and lowest in profile A although the difference is insignificant (p>0.05) Very fine-fine-grained sediments is the most preferred by ball sea cucumber juveniles while coarse sand seems to be unsuitable.