Browsing by Author "Oclarit, Jose M."
DNA amplicons using arbitrary primers distinguish polymorphic loci among mangrove thraustochytrid genomes JM Oclarit & NL Hepowit - In OCEANS 2007 - Europe, 2007 - Institute of Electrical and Electronics EngineersThraustochytrids - lightly-pigmented estuarine and marine microheterotrophs, taxonomically aligned with heterokont algae - are of great biotechnological interest because they produce substantial amounts of polyunsaturated fatty acids (PUFAs) especially docosahexaenoic acid (DHA:6n3). In this study, twenty-seven strains, isolated from twenty mangrove areas in the Philippine archipelago, were mass-produced in axenic flask cultures using high-glucose medium with continuous agitation. Polymorphic loci of thraustochytrid genomes, determined using four arbitrary primers (OPC02, OPC05, OPC07 and OPC08) in PCR analysis, were randomly amplified as molecular markers for genetic fingerprinting. Electrophoretic banding patterns of DNA amplicons, recognized based on nucleic acid size, were scored on data matrix and analyzed using Jaccard's coefficient and single-linkage hierarchical clustering to characterize degree of genetic relatedness among thraustochytrids. Conclusively, nearest-neighbor dendrogram of randomly amplified polymorphic DNAs (RAPDs) markers classify the strains into two monophenetic clades, representing the two major genera: Schizochytrium and Thraustochytrium.
Use of thraustochytrid Schizochytrium sp. as source of lipid and fatty acid in a formulated diet for abalone Haliotis asinina (Linnaeus) juveniles MR de la Peña, MB Teruel, JM Oclarit, MJA Amar & EGT Ledesma -
Aquaculture International, 2016 - Springer VerlagThe effects of using thraustochytrid Schizochytrium sp. as source of lipid and fatty acids in a formulated diet on growth, survival, body composition, and salinity tolerance of juvenile donkey’s ear abalone, Haliotis asinina, were investigated. Treatments consisted of diets either containing a 1:1 ratio of cod liver oil (CLO) and soybean oil (SBO) (Diet 1) or thraustochytrid (Diet 2) as source of lipid and fatty acids at 2 % level. Natural diet Gracilariopsis heteroclada (Diet 3) served as the control. No significant difference in growth was observed in abalone fed Diet 3 (SGR: 5.3 % BW day−1; DISL: 265 μm day−1) and Diet 2 (SGR: 5.2 % BW day−1; DISL: 255 μm day−1). Survival ranged from 78 to 85 % for all treatments and was not significantly different from each other. A 96-h salinity stress test showed highest survival of 84 % in abalone fed Diet 2 compared with those fed diets 1 and 3 (42 %). The high growth rate of abalone fed Diet 2 and high tolerance to low salinity could be attributed to its high DHA content (8.9 %), which resulted to its high DHA/EPA ratio of 10.5 %. These fatty acids play a significant role in abalone nutrition. The fatty acid profile of abalone meat is a reflective of the fatty acid profile of the oil sources in the diet. The present study suggests that the use of Schizochytrium oil in lieu of CLO and SBO can support good growth of abalone which is comparable with abalone fed the natural seaweeds diet.