Showing items related by title, author, creator and subject.

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  Biological monitoring in west bay, Laguna Lake: Phytoplankton composition and water pollution 

  Francisco, Jose C.; Perez, Teresita R. (Aquaculture Department, Southeast Asian Fisheries Development Center; Philippine Council for Aquatic and Marine Research and Development (PCAMRD), Department of Science and Technology; Bureau of Fisheries and Aquatic Resources, 2001)

  Phytoplankton composition and density were studied in three (3) stations in West Bay, Laguna Lake. Blue-green algae and diatoms were the most abundant in terms of cell density. Green algae had the most number of species. Diatoms predominated in the early parts of the year, under intense light conditions. Pulses of green algae were evident toward the end of the year, under high nitrogen concentrations. BIP (Biological Index of Pollution) values were very much affected by seasonal variations in the phytoplankton community.
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  A freshwater red alga Compsopogon coeruleus (Balbis) Montagne from Bucal, Calamba, Laguna, Philippines 

  Intong, Lizbeth; Martinez-Goss, Milagrosa R. (Aquaculture Department, Southeast Asian Fisheries Development Center; Philippine Council for Aquatic and Marine Research and Development (PCAMRD), Department of Science and Technology; Bureau of Fisheries and Aquatic Resources, 2001)

  Compsopogon coeruleus (Balbis) Montagne was observed for the first time along the shallow, flowing portions of the spring that occurs naturally in Bucal, Calamba, Laguna. A year-round study of some habitat conditions in the sampling site was done. These conditions included air and water temperature (mean=28.5°C), pH (mean=6.5), orthophosphate (mean=0.26 ppm), ammonia-nitrogen (mean =0.52 ppm), depth of water (mean=12 cm), speed of current (mean=0.19 m/s) and light intensity (mean=770 foot candles). This alga seems to be a good indicator of organic pollution. A description of morpho-cytological characteristics in situ and in culture is given. Better growth was observed in a defined inorganic medium using different mixing waters (distilled, tap and filtered Bucal waters) over plain mixing waters. Germination of presumptive cortical cells into uniseriate filaments and monospore germination was observed after about 10 days of incubation in all media.
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  Recent developments in aquaculture in Japan 

  Fukusho, K. (Aquaculture Department, Southeast Asian Fisheries Development Center, 1995)

  Aquaculture production in Japan in 1993 was 1,351,000 tons, 15.6% of the total fisheries production. About 93.6% came from mariculture and 6.4% from freshwater aquaculture. The per cent contribution of aquaculture to total production has increased in recent years but partly because marine fisheries,especially of sardine and pollack, have decreased. Aquaculture has reached a plateau, and decreased slightly between 1992 and 1993. Diverse marine and freshwater species are cultured in Japan — various fishes, crustaceans, mollusks, seaweeds, sea squirt, sea urchin, and others. Research and development in mariculture focus on finding substitutes for animal protein in feeds, improvement of fish quality, protection of the culture environment, use of offshore floating culture systems, and protection from diseases. Research in freshwater aquaculture has expanded to include recreational fishing, the propagation and preservation of endangered species, and the construction of fish ladders for salmonids and other migratory species.