UPV Theses and Dissertations
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Item Gonadal maturation Stages of Pinkfingered Vinegar Crab Episesarma chengtongense (Serene and Soh 1967) from Capiz, PhilippinesBarredo, Elilyn Farrah Belle B. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2015-06)The pink-fingered vinegar crab Episesarma chengtongense is a growing fishery resource in the mangrove areas of the Philippines and may have potential for aquaculture and stock enhancement. To determine the gonadal maturation stages for both male and female for this species, a study was conducted from February to May 2015 of the pink-fingered crab from Capiz, Philippines. The determination of the gonadal maturation stages was based on the gross morphology and histological characteristics of the male and female gonads. In both sexes, gonad activity occurred throughout the study duration but for females, the peak egg bearing month was in May (87%). Body sizes of ovierous females were from 31.9 - 42.3 mm (CW). The greatest prevalence of ovigerous females was in the size range of 35-39 mm CW; the lowest percentage at 40-44 mm CW. Male crabs with mature testes were consistently high (70- 100%) in the four months duration of the study. The smallest female carrying eggs was 31.9 mm CW. Four stages of ovarian maturation were identified namely: developing (Stage II) with a yellow colored gonad, ripe (Stage III) with orange colored gonad, mature (Stage IV) with brown colored gonad and spent (Stage V) with light brown colored gonad. Two stages of male gondal maturation were identified namely immature (Stage I) with translucent to off white testes and mature.(Stage II) with creamy white testes.Item Costs and returns analysis of municipal hook and line fisheries in selected coastal barangays of Hamtic, AntiqueBaldevia, Joan R. (Division of Social Sciences, College of Arts and Sciences, University of the Philippines Visayas, 1998-03)This paper aims to determine the social and economic conditions of municipal hook and line fishermen; the cost structure of the hook and line fishing method; the profitability level of the municipal hook and line fishermen; the sharing system employed in the municipal hook and line fishery; and to identify the problems of the municipal hook and line fishermen. The study utilized the cost and return analysis. The limitation of this kind of analysis is the assumption that changes in effort and adjustment in fish stocks are taking place simultaneously. The percentage and average analysis failed to take full consideration of the time element of the study since it was based at a "one-shot" interview. The locale of the study are the selected coastal barangays of Hamtic, Antique namely Brgy. Caridad, Mapatag and Asluman. Any conclusions in this study is only applicable to the area concerned by this fishing gear and does not apply to other fishing grounds. Findings of the study showed that the average income of the municipal household was PhP 4168 which was below the average monthly income in Region VI which was PhP 5339.8. They can not be considered absolutely poor however because their average monthly income was still higher to the regional poverty threshold which was PhP 8197/year. Food was the biggest cost outlay of the municipal household which accounted for 68% of the total household expenses. In terms of cost structure, variable cost accounted for 84% of the total cost per trip. This showed that in every fishing trip, the fishermen needs to have enough money to cover its operating expenses. The small percentage of the total fixed cost relative to the total cost shows the level of mobility of the fishing unit to move to another gear type or even to another market of the fishing industry. Labor cost accounted for 48% to total cost per trip which showed how labor intensive is the hook and line fishing method. The opportunity cost, on the other hand, accounted for 13% of the total cost per trip. Almost all indices of profitability posted a negative values. This negative economic profit indicate a definite evidence of economic overfishing. It also indicate that the fishermen should seriously rethink their position in the fishing industry. The differences in findings of the study among the three sample barangays can be attributed to three important variables. First, is the average hour/trip and the average trip/per week. Since this is a per trip analysis, this had an implication on all variables. Secondly, is the number of motorized boats per barangay. Motorized boats have a higher depreciation cost, opportunity cost of owned capital and running cost. Third, would be the number of boats with crewmen/operators per barangay. This reflect the percentage of the respondents with a sharing system and this would entail a higher labor cost and consequently to total cost per barangay. The sharing system was flexible as evidenced by the different sharing arrangement between Brgy. Mapatag which had a 50-50 sharing arrangement compared to Brgy. Asluman and Caridad which was 60-40. The primary problem of the municipal fishermen was the presence of big fishing vessels like the baby purse seiner. Other problems mentioned were the illegal fishing operations like trawling which operate during the night, lack of capital for repair and maintenance and bad weather conditions. The improvement of the socioeconomic conditions of the fishermen should call for a general improvement of the environment in which they operate. The recommendations of the study asserts that the government should develop additional employment opportunities outside the fishery sector. Fishing effort should be controlled by regulation of entry in terms of number of boats or gears employed because of economic overfishing. Large scale fishing like the baby purse seiner should be regulated and trawling be effectively prohibited to increase the resource base of the small-scale fishery. A clear boundary line should then be put up to avoid encroachment of the big fishing vessels to the municipal waters.Item Antimicrobial activity of macrofungal basidiomycetous mycelia against Vibrio spp.Bagacay, Jann Felnesh Exe V. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2023-06)Aquaculture is vital for global food security, producing 50% of the world’s fish. However, infectious diseases caused by fish pathogens like Vibrio species can lead to significant production losses. To address this issue, antimicrobial agents are commonly used. Macrofungal fruiting bodies and mycelia produce bioactive compounds with antimicrobial properties. This study aims to: (a) assess antimicrobial activity in isolated macrofungal samples against the fish bacterial pathogens Vibrio parahaemolyticus and Vibrio cholerae, (b) compare two methods (agar plug and crude extracts) for antimicrobial activity, (c) determine the minimum inhibitory concentration (MIC) using agar well diffusion and the agar plug methods, and (d) identify the macrofungal isolate with the highest antimicrobial activity. Ten morphospecies were collected from the University of the Philippines Visayas Miagao Campus. The samples were evaluated using the agar plug and agar well diffusion methods. The results showed antimicrobial activity against Vibrio cholerae and Vibrio parahaemolyticus. The activity index ranged from 0 to 0.83 and 0.22 to 0.78 for agar wells, and 0 to 1.00 and 0.70 to 1.30 for agar plugs, against V cholerae and V. parahaemolyticus, respectively. Termitomyces globulus and Trametes sp. 1 exhibited the highest activity indices using the agar plug and agar well diffusion methods, respectively. Statistical analysis confirmed significant differences in antimicrobial activity against both test organisms. These findings demonstrate the potential of macrofungi as a valuable source of antimicrobial compounds for controlling fish pathogens in aquaculture. Further research could lead to the identification and utilization of these compounds to minimize production losses and improve disease management in aquaculture.Item Economic analysis and adaptation measures of small-scale aquaculture in Roxas City, CapizBaes, Marla May A. (Division of Social Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2015-06)This research was conducted to find out the contribution of the aquaculture industry to the city and to the small-scale farmers of Roxas City. It also determined the socio-economic impacts brought by the hydrometeorological events and identified the adaptation measures employed by the local government and the aquaculture operators. This study used cost and returns analysis, market based approaches and OLS regression to analyze the data gathered from the 187 small-scale milkfish, mussel, and oyster farmers in Roxas City. The findings showed that the aquaculture industry significantly contributed to revenue, employment, production and profit. However, the industry was affected by hydrometeorological events which brought about significant damage cost. Most of the aquaculture operators employed various adaptation strategies to cope with these hydrometeorological occurences. Some of them, however, did not find it necessary to adapt because either they do not have enough money to finance adaptation strategies or they perceive that the impacts are not that significant. This study recommends that the government should provide other alternative climate-resilient livelihoods to the small- scale operators. It should also employ sustainable adaptation measures aside from providing trainings and seminars about aquaculture operation such as by integrating climate change adaptation techniques to aquaculture farming.Item Growth and nutritional content of red seaweed Gracilaria bailinae (Zhang et. al., 1995) grown under different fertilization schemeAlmojuela, Kristine Marie T. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2012-04)The accelerated development of fish aquaculture has caused many environmental problems. The most evident effects resulting from this activity is the increase in organic material, the reduction in dissolved oxygen and the excessive rise in inorganic nutrients such as nitrogen, phosphorous and carbon dioxide. The integration of seaweeds to fed cultured species has long been recognized as promising approach to reduce the excess nutrients released by aquaculture activity. The nitrogen and phosphate uptake kinetics, growth and nutritional content of the seaweed Gracilaria bailinae were studied in a series of outdoor tanks, fertilized with commercial fertilizer (NH4CI, NaNO3, and Na2HPO4) and shrimp culture waste water. The nutritional content of G. bailinae before and after fertilization was also determined through proximate analysis. Results showed a significant removal of dissolved nutrients by G. bailinae, although definite uptake rate could not be determined since the data were erratic and Michaelis-Menten model could not be applied. Seaweeds fertilized with shrimp waste water showed best specific growth rate (1.37±0.2 % d-1) over other fertilization scheme. This suggests that shrimp pond effluents could promote good growth on G. bailinae. Local G. bailinae had high protein content per se (14%) but became more enhanced when fertilized with commercial or shrimp waste water (23-32%). In contrast, its carbohydrate content dropped when heavily fertilized from 39% to 19%.Item Fish farming and the fish community: The case of Victorias, Negros OccidentalApawan, Maylanie D. (Division of Social Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2001-04)The rapid expansion of aquaculture in the past decades has brought about some economic benefits, but it has also resulted in various social and environmental problems. This observation points to the need to look at aquaculture development beyond conventional measures emphasizing economic benefits; there is a need to focus on the interplay of social, economic, and environmental factors in looking at aquaculture development. This study looks at the social, economic, and environmental impacts of aquaculture on small fishers in three coastal villages in Victorias, Negros Occidental and examines the responses of small and subsistence fisherfolk to the growth and proliferation of fish farming. The study points out the social and environmental issues usually arise as a consequence of conflicts between fish farmers and small fishers in the use of land and water and also because of the effluent charge and chemical residues coming from fishpond operations. When contextualized within a larger set of social and ecological issues, these conflicts have wider implications, especially when these involve unequal distribution of costs and benefits among different stakeholders.Item The development of the aquaculture industry in the Philippines: 1970-1998Anico, Joecel Jones A.; Caulin, Ray D. (Division of Social Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2001-03)This paper presents and discusses the development of the aquaculture industry in the Philippines, the government policies, and the different factors that may have contributed to this. The aquaculture sector has been prioritized by the Philippine government from the 70's up to the present, viewing it as an integral component in country’s aim to attain economic development through the industry’s perceived positive impact on the communities where these activities take place. The study, however, found out that a closer look at tins so- called impact reveals that not everybody benefits from it. It was found out that the gains that aquaculture brings to these communities are only enjoyed by a selected few. The study also found out that the goals of increasing food supply and generating employment were not attained, at least in the view of the people living nearby these areas. The goal of generating foreign exchange is fulfilled, however, this only benefits an elite social group. These problems are attributed to the weaknesses of the social, political, and economic structures of the country and the loopholes in the design implementation, monitoring, and evaluation of the policies and programs adopted by the government.