UPV Digital RepositoryUPV-DRUniversity of the Philippines Visayas
 

Masters Theses

Permanent URI for this collectionhttps://hdl.handle.net/20.500.14583/12

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Discipline: search.filters.discipline.FisheriesSDG: search.filters.sdg.SDG 3 - Good health and well-being

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    Survival of nursery-reared juvenile milkfish, Chanos-chanos at different transport density, temperature and anaesthetic combinations
    Failaman, Alan N. (University of the Philippines Visayas, 2020-06)
    Experiments were conducted to optimize transport conditions of nursery cultured juvenile milkfish in a closed plastic bag based transport system. In the first experiment combined effects of temperature (25-27°C, 20-22°C and 15-17°C) and anesthetics (2-phenoxyethanol at 200 mgL-1 for initial sedation and 80 mgL-1 for transport sedation) on oxygen consumption and survival ofjuvenile milkfish, Chanos chanos, were evaluated. Another experiment was conducted to optimize transport conditions at fish densities of 200, 400, 600, 800 and 1000 gL-1 for 4, 8, 12,16 and 20 hour duration. The study showed no significant difference on oxygen consumption rates ofmilkfishjuveniles subjected to various water temperature range and anesthetic combinations. Temperature range of 20 to 22°C in combination with anaesthetic (2-phenoxyethanol) application was the best condition for long duration confinement of milkfish juvenile in closed plastic transport bags. The study established the optimum juvenile milkfish transport density and the effective transport duration. With anaesthetic application (2-phenoxyethanol), juvenile milkfish density of 600 gL-1 is effective for 20 hours oftransport duration, 800 gL-1 for 8 hours oftransport duration and 1000 gL-1 effective for 4 hours transport duration. These results provide a practical protocol for the transport of juvenile milkfish from the nursery culture area to the grow-out production area.
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    Characterization of the egg masses of Wedge Sea Hare, Dollabella auricularia (Lightfoot, 1786) from Danao-Carmen Cove, Cebu, Philippines
    Pepito, Ador R. (University of the Philippines Visayas, 2016-06)
    The egg mass locally, known as "lukot” of the wedge sea hare Dolabella auricularia is considered as one of the seafood products in the Visayas region. It is traditionally consumed as raw or an added ingredient to a soup made from fish or shellfish. Although there have been no reported incidence of food poisoning due to the consumption of these egg masses, a preliminary study revealed the potential presence of some toxic substances in the samples. Likewise, no detailed study on the chemical characteristics of these egg masses has been reported. Hence, this study was conducted to determine the toxicity potential and the effect of the post harvest treatment on the chemical quality of the egg mass. Different post harvest treatments were employed in this study includes: acidified, boiled and the combination of the two. Results show low toxicity potentials in all samples both treated and untreated. No significant differences among all treatments on the lowering of the toxicity potentials of the egg mass were observed. This low toxicity potential could be attributed to the effect of seasonal variation in the sample and its habitat. Different post harvest treatments, on the other hand, reveal different effects on the chemical characteristics of the egg masses. Acidified and the combination of acidified and boiled samples show high protein, carbohydrates and ash content. Boiling of samples resulted to an increase in moisture retention and potassium while acidified samples resulted in high calcium and potassium. Raw or fresh samples show high total fat, ash, sodium and zinc content. In terms of amino acid profile, the egg masses have six (6) essential, nine (9) non-essential and eight (8) other amino acid components. These results indicate that the egg masses of the wedge sea hare can be considered as a good potential exotic nutritious food commodity from marine environment. Its safety, however, largely depends on the condition of the environment where these egg masses are harvested.