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UPV Theses and Dissertations

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1996 - 19973

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Committee Chair: search.filters.chair.Torres, James

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    Comparison between commercial pellets and golden apple snail pellets as food for Tilapia nilotica fingerlings
    Arboleda, Daphne A. (Dision of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 1997-04)
    The viability of Golden apple snail as food for Tilapia nilotica was determined by comparing it with commercial pellets. The experiment was conducted on February 3, 1997. The two treatments had three replicates each with a stocking density of 15 fingerlings each. Comparison of growth curves showed that fingerlings fed with commercial pellets grew significantly (P< 0.01) faster than those fed with golden apple snail pellets. The computed FCR was also greater for commercial pellets. The results suggest that golden apple snail alone does not promote efficient growth in Tilapia nilotica fingerlings. Thus it is recommended that golden apple snail be combined with other food ingredients to enable its efficient utilization as a protein source.
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    A comparison on the effect of light on melanophore differentiation in the larval stage of frog, Hyla sp.
    Araneta, Merrie Celine E. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 1996-03)
    Three set-ups were exposed to different experimental conditions namely: set-up A. under prolonged light: set-up B. under prolonged darkness: set-up C. under normal condition. Observation was done under the dissecting microscope from the first appearance of melanophores until the migration was stabilized. The pattern of differentiation was observed to be the same in all set-ups. only the distribution and the color intensity differred. B was the darkest and C was the lightest. It only showed that light could not, alter the pattern of melanophore differentiation, only the distribution.
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    Larval rearing of Scylla serrata Forskal: The effect of Artemia salina and Brachionus plicatilis as food on the growth and survival of zoea
    Apote, Ma. Noemi G. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 1996-11)
    A study was conducted to find out tile effects of Artemia, Brachionus and a combination of Anemia and Brachionus as food on the survival of mudcrab Scylla serrata Forskal zoea and the ability of the zoea to metamorphose to megalopa stage. The study composed of three experiments. Each experiment lasted for 21 days. Results showed highest mean percent survival (66.7±2.03) on zoea fed with a combination of Anemia and Brachionus at a feeding density of 5 individuals/ml each. When the density of Brachionus was increased from 5 individuals/ml to 12 individuals/ml in the combination diet, there was an increase in the survival of the zoea to 68.9±2.41. Highest metamorphosis from zoea to megalopa was also obtained on those fed with a combination of Anemia and Brachionus. This combination diet also gave the shortest number of days for the zoea to metamorphose to the next stage which also resulted to the least number of days for megalopa production to start. The study also revealed that larvae ted with a combination of Anemia and Brachionus reared at 30 ppt salinity got high survival on the first three days of culture, however starting on the 4th day up to the 15th day of culture, those reared at 28 ppt obtained higher survival although not statistically different from the other salinities tested.