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UPV Theses and Dissertations

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1997 - 19993

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End date: 1999Keyword: search.filters.keyword.Fish

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    Effects of high and low protein diets on the gut evacuation rate of Tilapia nilotica
    Andrada, Bryan Andrew S. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 1999-03)
    Gut evacuation rate of young Nile tilapia, Tilapia nilotica fed commercial pelleted diets containing high or low protein diet were determined in the laboratory. The decline in gut fullness of the fish with time was examined at low and high protein diets. Two mathematical models were used to express the decline in gut fullness of the fish with time. Fish fed the low protein diet followed more closely the linear model while those fed the high protein diet followed the logarithmic model. The level of protein resulted in different gut evacuation rates (GER), expressed as coefficients b of the gut fullnesstime curve. GER values were higher in either linear or logarithmic models for fish fed low protein diet than for those fed high protein diet.
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    An assessment of the fishery ordinances of the different coastal municipalities in the Province of Iloilo, 1992-1998
    Almero, Flora B.; Gerona, Ma. Leda G. (Division of Social Sciences, College of Arts and Sciences, University of the Philippines Visayas, 1999-12)
    This research project is an assessment of the fishery ordinances of the different coastal municipalities in the Province of Iloilo. The study covers the fourteen (14) coastal municipalities of the Province namely; the Municipality of Anilao, Banate, Barotac Nuevo, Barotac Viejo, Batad, Carles, Concepcion, Dumangas, Estancia, Miag- ao, Oton, San Dionisio, San Joaquin and Tigbauan. The primary data were taken from the various municipal fishery ordinances of the different coastal municipalities under study, and the national fishery policies (RA 7160, PD 704, RA 8550). The researchers also employed field interviews with selected fisherfolk leaders as a source of first hand information concerning the recent situation of the fishery industry in their respective municipalities. It was found that: (1) the fishery industry in the Province of Iloilo is facing problems on overexploitation, overfishing, pollution, and habitat destruction; (2) the primary concern of the over-all policy mosaic for the fishery industry is the rehabilitation and protection of the coastal environment, the limitation of access to fishery resources comes as the secondary concern, while the protection of the rights of municipal fisherfolk appears in a very limited number of promulgations only; (3) generally the provisions in the over-all policy mosaic is consistent and complimentary, both vis-a-vis the national fishery policies and within their respective municipal fishery ordinances where the provisions belongs. Assessing the municipal fishery ordinances of the different coastal municipalities in the Province of Iloilo, it was found that the goal of the over-all policy mosaic is the promotion of sustainable development for the fishery industry so as to achieve food security in terms of fish.
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    Economic analysis of tilapia pond culture in Iloilo
    Arellado, Emily A. (Division of Social Sciences, College of Arts and Sciences, University of the Philippines in the Visayas, 1997-03)
    This paper analyzed the factors affecting production of tilapia pond culture in Iloilo using the production function approach. The study used primary and secondary data. Primary data were gathered from a survey of actual operations of 30 tilapia farmers in Iloilo. Secondary data were taken from the Department of Agriculture in Sta. Barbara, Iloilo, the SEAFDEC and UPV libraries. The production function was specified using the Cobb-Douglas function to identify and explain the factors affecting variations in the output of tilapia. The explanatory variables included in the analysis were: fingerlings stocked (X1), inorganic fertilizers (X2), organic fertilizer (X3), supplementary feeds (X4), farm size (X5), hired labor (X6), miscellaneous operating costs (X7), number of years in tilapia farming (X8) and age of pond (X9). There were six variables found significant in explaining tilapia 'production namely; fingerlings stocked, inorganic' fertilizer, organic fertilizer, farm size, hired labor and age of pond. The F—statistic rejected the null hypothesis which states that no explanatory variables help to explain variations in the dependent variable. Therefore, the alternative hypothesis was accepted that at least one or more of the independent variables affect production. The R2 showed that 92 percent of the variations of the explanatory variables explained the variations in the independent variables. This implies that there exists a relationship between the independent and dependent variables. Fingerlings stocked, inorganic fertilizer and hired labor were used inefficiently by the tilapia farmers. The use of fingerlings stocked should be increased while the use of inorganic fertilizer, organic fertilizer and hired labor should be reduced, if the maximum net returns are to be realized.