Now showing items 1-8 of 8

    • Article

      Acute toxicity of unionized ammonia to milkfish (Chanos chanos Forsskal) fry 

      NA Jumalon - SEAFDEC Aquaculture Department Quarterly Research Report, 1979 - Aquaculture Department, Southeast Asian Fisheries Development Center
    • Conference paper

      Commercial production of Artemia in the Philippines 

      NA Jumalon, DG Estenor & DM Ogburn - In P Sorgeloos, D Bengtson, W Decleir & E Jaspers (Eds.), Artemia Research and its Applications : Vol. 3. Ecology, Culturing, Use in Aquaculture. Proceedings of the Second International Symposium on the Brine Shrimp Artemia, 1-5 September 1987, Antwerp, Belgium, 1987 - Universal Press
      This paper summarizes experiences and findings in the development of a tidal saltpond system, integrated for commercial Artemia production. The basic rules of successful pond production of fish and shrimp, which are the exclusion of predators and competitors, the maintenance of good water-quality, the provision of sufficient food and the proper harvesting method, also govern Artemia culture.

      In attempting to achieve successful Artemia culture, an integrated flow-through system was developed. The necessity for a detailed plan of the ponds with well-determined elevations, advantageous positioning of gates and canals, correct pond orientations, and well-constructed dikes is considered crucial to integration.

      Procedures for proper Artemia pond preparation are discussed. The relatively high rainfall (1 200-2 000 mm/year) in the Philippines necessitates reliable screen designs to exclude potential fish predators and overflow devices for freshwater runoff, to extend the duration of Artemia seasons.

      Installation of tidal plane gauges and an auxiliary high volume pump in the salt farm permits the manipulation of water levels to ensure adequate water exchange or supply to the system, high evaporation : salt bed ratios, and optimal depths of high salinity water. The daily water requirements for the system were determined and its relationship to salt production examined.

      The integration of organic fertilization and the utilization of drainage from semi-intensive prawn and shrimp ponds enabled to achieve high standing crops of Artemia (up to 7 tonnes wet weight/ha) in high-salinity ponds that are unsuited for fish or prawn culture. Under optimal conditions, the Artemia cyst production reaches 20 kg dry weight/ha/month.
    • Article

      Effects of various diets on the nutritional value of Artemia sp. as food for the prawn Penaeus monodon 

      OM Millamena, RF Bombeo, NA Jumalon & KL Simpson - Marine Biology, 1988 - Springer Verlag
      The nutritional value of Artemia sp. as food for marine fish and crustacean larvae has been linked to the level of its polyunsaturated fatty acid (PUFA) content. Experiments in August 1984 were conducted to determine the effects of various artificial diets and algae on fatty acid composition of PUFA-deficient Artemia sp. (Utah GSL strain) and their resulting value as food for postlarvae of the prawn Penaeus monodon (Fabricius). Nauplii of the brine shrimp were grown on extracts of corn, copra, soybean and rice bran containing precursors (C18) to long-chain PUFA and also on algal species containing different levels of long-chain PUFA (C20). The nauplii were then used as food for P. monodon postlarvae. The results revealed that absence of C20 polyunsaturates from the feeds and their presence in the algae were reflected in the polyunsaturated fatty acid content of the tissues of Artemia sp. When fed with brine shrimp fed on algae, P. monodon displayed better postlarval survival and significantly higher growth; related to the content of polyunsaturated fatty acids in Artemia sp. A practical feeding approach in prawn hatcheries would be to grow Artemia sp. on a cheap diet such as rice bran, and then to enhance its nutritional value with a diet high in PUFA prior to harvesting, in order to improve hatchery production.
    • Conference paper

      An integrated semi-intensive shrimp and livestock system in the Philippines. 

      DM Ogburn, NA Jumalon & ML Sycip - In JL Maclean, LB Dizon & LV Hosillos (Eds.), The First Asian Fisheries Forum. Proceedings of the First Asian Fisheries Forum, 26-31 May 1986, Manila, Philippines, 1986 - Asian Fisheries Society
      The development of shrimp (Penaeus monodon) production system integrated with livestock was undertaken at the Sycip Plantation Inc., Negros Orienta, Philippines, as a result of crop diversificstion efforts in the province. Heavy organic manuring of brackishwater shrimp ponds strongly simulated the production of lablab in the initial stages of pond preparation. Obsevations suggest that the problem of detriorating water quality in the last stage of culture due to prawn burrowing/feeding activities, was exacerbated by constant addition of anures. Plankton analysis of pond water indicated that this was a result of excessive nanno- and picoplankton blooms. A highly sinificant correlation (P < .001) between plankton (cell size < 5 microns) count and BOD was obtained. An alternative system using "kitchen ponds" stocked with artemia provided a suitable source of food for shrimp growth. Daily additionalof manure (100 kg dry weight/ha/day) produce an average 40 kg of ixed artemia and lablab protein each day during a three-month study period. Analysis of input:output ratios for the kitchen pond showed a net loss in organic matter and net gain in nitrogen yields during the conditioning period. Conditioned ponds had a net gain in both organic matter and nitrogen yields. An ares ratio of 1:5 for kitchen pond shrimp grow-out enable production at 700-1,000 kg/ha/crop at 30,000 pieces/ha stoking density, survival and grow-out period of 120 days. Significant reductions in feeding cost were obtained.
    • Conference paper

      Nutrient flow and physicochemical profile studies of an integrated poultry-salt-Artemia-milkfish-sea bass-shrimp pond production system 

      NA Jumalon & DM Ogburn - In P Sorgeloos, DA Bengtson, W Decleir & E Jaspers (Eds.), Artemia research and its applications: Vol 3. Ecology, Culturing, Use in Aquaculture. Proceedings of the Second International Symposium on the Brine Shrimp Artemia, 1-5 September 1987, Antwerp, Belgium, 1987 - Wetteren, Belgium: Universal Press
      The physicochemical and biological parameters of an integrated flow-through poultry-salt-Artemia-milkfish-sea bass-shrimp pond production system were monitored for 6 months to determine the pattern of nutrient changes and associated plankton communities as water passed through the system. A 20 ha salt farm in Negros Oriental, Philippines, was used as a model of the integrated system. The construction of a poultry farm at the inlet reservoir provides continuous fertilization and allows considerable control of nutrient inputs to the pond system. Nutrients increase markedly in the chicken pond and in subsequent ponds undergo cycles of biological assimilation and bacterial mineralization.

      Principal component analysis ordinates temporal and spatial changes in 33 variables that were monitored. Using scatter diagrams of the principal components enabled separation of ponds adjacent to the crystallization bed and ponds high in fish biomass from the rest of the system. Variables that served to numerically delineate the ponds in this manner were salinity, phosphate, ammonia, alkalinity, turbidity, acidity, microplants, pico- and nannoplankton. The implications of this ordination in relation to pond management techniques is discussed.
    • Conference paper

      Sampling and stocking density studies for Artemia production in ponds 

      NA Jumalon & RE Robles - In GL Rogers, R Day & A Lim (Eds.), Proceedings of the First International Conference on Warm Water Aquaculture-Crustacea, held on the Brigham Young University Hawaii Campus, February 9-11, 1983, 1983 - Brigham Young University Hawaii Campus
      This study is conducted to develop a sampling program and to determine the optimum stocking density for Artemia production in earthen ponds.
    • Article

      Selection and application of a suitable sampling method for quantitative and qualitative evaluation of lab-lab 

      NA Jumalon - SEAFDEC Aquaculture Department Quarterly Research Report, 1978 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Milkfish and prawn pond operation in the Philippines is often associated with lab-lab culture. Lab-lab is a biological complex of blue-green algae, diatoms, bacteria and various animals which form a mat at the bottom of nursery ponds or floating patches along the margins of ponds. This complex is considered the most favorable food of milkfish in brackishwater ponds. Variations in the quantity and quality of lab-lab between and within areas of a 1,000 sq. m. pond was determined over 2 culture periods (6 month duration) and the applicability and suitability of stratified random sampling as a method of sampling lab-lab was evaluated.
    • Conference paper

      Studies on Artemia production in earthen ponds in the Philippines 

      NA Jumalon, DG Estenor, RF Bombeo & AM Dadole - In GL Rogers, R Day & A Lim (Eds.), Proceedings of the First International Conference on Warm Water Aquaculture-Crustacea, held on the Brigham Young University Hawaii Campus, February 9-11, 1983, 1983 - Brigham Young University Hawaii Campus; Brigham Young University Hawaii Campus