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UPV Theses and Dissertations

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    Economic profitability of shrimp (Acets spp.) processing in Barangay Atabayan, Tigbauan, Iloilo
    Belleza, Rey M.; Saloria, Jet R. (Division of Social Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2002-04)
    In general, this study aims to determine the economic profitability of shrimp processing in Barangay Atabayan. Specifically, the study describes the sociodemographic profile of the processors and the costs incurred in processing. It also identifies the problems encountered by the processors, and describes the production and pre-sale practices of the business. This study uses the census method in data gathering. All the eleven processors served as respondents. An interview translated into Kinaray-a was used to gather information from processors. The respondents were classified according to the method of processing they used: (1) fermentation, that produces guinamos and (2) drying, that produces kalkag. Seven of the processors were male and 4 were female; their average age was 54.45 years. They have been into shrimp processing at an average of 25.91 years. They do not rely on shrimp processing alone. Some of them engaged in farming, fishmeal selling, fishing and part-time driving. The processors had positive operating profit per-kg-of-produce per production day. In general, the processors had a positive financial profit per-kg-of-produce but the processor engaged in drying only incurred a negative financial profit. Fermentation had a positive pure economic profit per-kg-of-produce while drying had a negative pure economic profit. For drying to be profitable, costs of variable inputs must be considered. Results showed that it is more profitable to venture in both drying and fermentation because of a higher pure economic profit compared with venturing in fermentation or drying only. Weather, uncertainty of payments of some wholesalers, entry of illegal fisher folk from neighboring towns and the outlawing of sungkit, a gear used in catching the shrimps, were the problems faced by the shrimp processors.
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    Histopathology of the gill, abdomen, and lymphoid organ of giant black tiger shrimp (Penaeus monodon) infected with white spot syndrome virus (WSSV)
    Apines, John S. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2004-03)
    Histological changes in giant black tiger shrimp, Penaeus monodon, were investigated at various time intervals after injection with white spot syndrome virus (WSSV). After infection with the virus, mortalities were observed. Gills, abdomen, and lymphoid organ (LO) were then dissected and subjected to histological examination. The study revealed that the lymphoid organ was the most severely damaged compared to the gills and abdomen. The abdomen, although low in prevalence, was one of the target organs of the virus. Light microscopy showed the aggregation of hemocytes in the abdominal muscles of the shrimp. The infected shrimp were found to have a high prevalence of apoptotic cells. The results of this study supported the earlier findings that cell death in viral infection may have resulted mainly from apoptosis and that increasing numbers of apoptotic cells probably caused the death in WSSV-infected shrimp. Moribund shrimp had extensive deterioration of vital tissues such as the gills and lymphoid organs, thus affecting vital processes in the shrimp body. Gross signs of lethargy and weakness were observed in the moribund shrimps. Hemocyte aggregation, as well as formation of spheroids, were observed in the hemal sinuses of the LO, the abdominal region and the gills. The results are discussed in relation to the hypotheses of acquired tolerance and quasi-immune response in shrimp.
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    A survey of the catch composition of fyke nets in the Iloilo river
    Andrada, Kristina Abelaine D. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2000-04)
    A survey of the catch composition of fyke nets in the Iloilo River Estuary during the months of August 1999 and February 2000 show that catches are dominated by Metapenaens crisis and ilossygobius sp. The 18 species caught are : 9 fish species, 5 shrimp species, and 4 crab species. The index of similarity 0.3 between the monthly samples is low which means that there is minimal degree of similarity between the species composition of the catches. There is no significant difference between the total catch volumes per day for the months of August 1999 and February 2000 which means that the seasons do not affect the volume of the catch.
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    Evaluation of commercial shrimp larval diet as replacement of live foods in mudcrab larval rearing
    Burlas, Michael Rey J. (College of Fisheries and Ocean Sciences, University of the Philippines Visayas, 2014-04)
    The use of live food such as rotifer and Artemia entails high cost of production in the hatchery. Hence, the general objective of the study was to reduce the use of natural food in the larval rearing of mud crab. The first study was conducted to screen four types of commercial shrimp formulated larval diet (Lansy, P. japonicus, P. monodon and BP Nippai) in mudcrab Scylla serrata larval rearing. Formulated diets were fed to each stage from zoea 1 to megalopa at an equivalent of 100% dry weight of the live food. Growth index and survival were determined at the end of the experiment. Results showed that of zoea 1 fed any of the formulated diet did not molt to zoea 2. When formulated diets were fed to zoea 2, 3 and 4, there was a decreasing trend in the growth index and survival as the larvae developed. Zoea 5 fed any of the formulated diet failed to molt to megalopa stage. Among the four formulated diets, BP fed larvae had better growth and survival. BP was then used in the second study to determine the amount of formulated diet (FD) that could replace natural food (NF) such as rotifer and Artemia. Results showed that larvae fed 25% FD + 75% NF and 50% FD + 50% NF had better survival and growth than those larvae fed 100% FD + 0% NF, 75% FD + 25% NF and 0% FD + 100% NF. This study indicates that shrimp larval diet in combination with formulated diet can be used to improve the growth and survival of S. serrata larvae.