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    Successional development of microfouling and macrofouling on fish farm enclosure
    Reyes, Rikka (College of Fisheries and Ocean Sciences, University of the Philippines Visayas, 2018-06)
    This study investigated the influence of net color (yellow and green), immersion period, and environmental conditions on micro- and macro-fouling development in marine fish farm. Yellow and green net panels in PVC frame were set-up at lm depth and immersed for 60 days within fish farm vicinities of Igang Marine Station- SEAFDEC, Guimaras Philippines. B. infantis (15-26 %), M. salsuginis (34-50 %) and P. lipolytica (21-21 %) belonging to Gammaproteobacteria and Firmicutes group were the most abundant microfouling bacteria. On the other hand, species such as Bryozoan Bugula sp. (31-38%), tanaids Tanaidae (64-146 ind.100 cm'2), and nematodes Linhomoeidae and Oncholaimidae (142-189 ind. 100cm'2) were the most abundant macrofoulants. MDS ordination revealed that micro- and macro-foulants formed at 7-day were significantly different between green and yellow nets (ANOSIM, p<0.05). Macrofouling gastropods, fish eggs, and macroalgae were present on green at 7-day but only appeared in yellow nets at 15- day. This suggests that lighter color nets in fish farm may delay the development of biofouling. The effect of color, however diminished from 15-day due to the presence of brown film covering all nets. Total biomass, cover, and densities of biofoulant groups (invertebrates, macroalgae, and fish eggs) were not significantly influenced by color (ANOVA, p>0.05) as previously reported. The identity of the foulants and succession pattern suggest the influence of trophic interaction such as predation and competition.
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    Characterization and identification of previously isolated bacteria from water and sediment samples along Forbes Bridge and Sooc Bridge in Iloilo River
    Abangan, Cassey S. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2011-04)
    This study identified and characterized eighteen previously collected bacteria from water and bottom sediment samples in Forbes Bridge and Sooc Bridge along Iloilo River. Conventional method of bacterial characterization was used in this study. Morphological, physiological and biochemical tests were employed to all bacterial isolates. Identification to genus level was based on The Prokaryotes and Bergey’s Manual of Systematic Bacteriology. Four genera were identified: Staphylococcus spp. was the most abundant (50%), followed by Bacillus spp. (22.22%), Acinetobacter spp. (16.67%), and Cellulomonas spp. (11.11%). Staphylococcus spp. and Bacillus spp. were found in both sampling sites, while Acinetobacter spp. was found only in Forbes Bridge area and Cellulomonas spp. was present only in Sooc Bridge area. Three genera were identified in samples from Forbes Bridge: Staphylococcus spp. (45.5%) followed by Acinetobacter spp. and Bacillus spp.of equal distribution of 27.35%. Three genera were also identified and characterized from water and sediment samples from Sooc Bridge: genus Staphylococcus (37.14%), followed by Cellulomonas (28.67%) and lastly, Bacillus spp. (14.29%). The result of the study revealed that the two sampling sites were contaminated with bacteria. Bacterial contamination predominantly came from animal and human waste from residential units, establishments and hospitals brought to the river water directly or through runoffs.