http://hdl.handle.net/20.500.12066/5161 2026-04-05T18:26:11Z http://hdl.handle.net/20.500.12066/5176 Culture and use of algae in Southeast Asia. Proceedings of the Symposium on Culture and Utilization of Algae in Southeast Asia, 8-11 December 1981, Tigbauan, Iloilo, Philippines Dogma Jr., Ireneo J.; Trono Jr., Gavino C.; Tabbada, R. A. Abstracts of the 13 papers presented at the symposium are cited individually. A variety of topics were covered, including the culture of micro and macroalgae, the processing of algal products and their utilization in industry as natural feed for aquaculture animals, the status of seaweed resources and their production, and the biology and use of algal populations as an indicator of the state of the aquatic environment. 1990-01-01T00:00:00Z http://hdl.handle.net/20.500.12066/5175 Water quality assessment of the Langat River, Selangor, Malaysia using the natural algal periphyton community and laboratory bioassays of two Chlorella species Anton, Ann Dogma Jr., Ireneo J.; Trono Jr., Gavino C.; Tabbada, R. A. The physico-chemical conditions in 10 sampling stations off the headwaters of the Langat River, Selangor, Malaysia were studied. Monitoring was done twice a month from June to December 1980. Changes in water quality were observed downstream. A total of 35 taxa of periphyton in four main divisions of algae were identified. The decrease in the number of species in downstream stations could be due to changes in the river rather than to chemical pollution. Two species of Chlorella , namely, C. pyrenoidosa and C. vulgaris , were grown in filtered river water obtained from the different sampling stations to assess their growth responses. Results suggest that pollution in the Langat River was caused mainly by heavy siltation rather than chemical pollutants. 1990-01-01T00:00:00Z http://hdl.handle.net/20.500.12066/5174 Antithamnion sparsum , its life history and hybridization with A. defectum in culture Lee, I. K.; Boo, S. M. Dogma Jr., Ireneo J.; Trono Jr., Gavino C.; Tabbada, R. A. Antithamnion sparsum isolated from the southern and western coasts of Korea showed a basically Polysiphonia -type life history. However, it sometimes exhibited a monoecious reproduction and the carpospores released from the cystocarp by self-fertilization unexpectedly developed into plants bearing spermatangia alone. These male plants were not functional up to 60 days in culture. The results of intraspecific crosses between populations of A. sparsum were successful and the hybrid carpospores gave rise to normal tetrasporophytes. On the other hand, the interspecific crosses between A. sparsum and A. defectum were only partly successful, as evidenced by gonimoblast development and the release of carpospores in case of A. sparsum (male) x A. defectum (female), but not in A. sparsum (female) x A. defectum (male). These results seem to suggest that both species are still undergoing speciation. 1990-01-01T00:00:00Z http://hdl.handle.net/20.500.12066/5168 Algal production and utilization relevant to aquaculture in the Philippines Pantastico, Julia B.; Baldia, Jose P.; Espegadera, Corazon C.; Reyes Jr., Deogracias M. Dogma Jr., Ireneo J.; Trono Jr., Gavino C.; Tabbada, R. A. An outline is given of research conducted at the Aquaculture Department of SEAFDEC at Rizal, Philippines regarding algal culture and utilization. Culture methods for both brackishwater and freshwater algae are described and details given of applications of microalgae in the aquaculture industry, which include feed for fish and shrimp larvae. 1990-01-01T00:00:00Z