Now showing items 1-11 of 11

    • Conference paper

      Application of engineering scale-up principles in aquaculture 

      RR Platon - In Report of the National Consultative Meeting on Aquaculture Engineering, 2-5 October 1985, Philippines, 1986 - ASEAN/UNDP/FAO Regional Small-Scale Coastal Fisheries Development Project
      The effects of water movement or agitation on the biological performance of planktonic organisms under intensive culture have been rarely studied quantitatively. Stagnation or minimum values are considered important in the problem of scale-up based on optimum conditions. Near stagnation, inadequate water movement brings about undesirable effects, e.g. accumulation of metabolites, uneven distribution of feed and low dissolved oxygen concentration. An important mechanism associated with water movement at these conditions is the oxygenation process which defines the oxygen transfer rate from the gas to the water.

      Experiments were conducted using potable water to determine the overall oxygen mass transfer coefficient in two types of container geometries: a) cylindri-conical tank and b) oblong-shaped center-partitioned raceway. For each type of container, three geometrically similar sizes were investigated with scale ratio of approximately 1:2:3:5. Agitation was induced by the introduction of air into the system. General correlations for both tank geometries were obtained from experimental data and were expressed in terms of the operating and geometric parameters. The correlations are in the form of dimensionless groups (Froude and Reynolds numbers) making them appropriate for scale-up estimates.

      The general correlations for the overall oxygen mass transfer coefficient were subsequently used to provide the scaling equations to define the operating parameters in different sizes of containers for the culture of brine shrimp in sea water fed with rice bran. The high correlation coefficient obtained for the relationship between total brine shrimp biomass production and the overall mass transfer coefficient applicable to different sizes of both the cylindri-conical tank and the raceway indicates that the overall oxygen mass transfer coefficient is an effective scale-up criterion in brine shrimp culture.
    • Book

      Design, operation and economics of a small-scale hatchery for the larval rearing of sugpo, Penaeus monodon Fab. 

      RR Platon - 1978 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Series: Aquaculture extension manual; No. 1
      One of the major problems in the mass production of sugpo is how to obtain a constant supply of fry. Since ultimately it is the private sector which should produce the sugpo fry to fill the needs of the industry, the Barangay Hatchery Project under the Prawn Program of the Aquaculture Department of SEAFDEC has scaled down the hatchery technology from large tanks to a level which can be adopted by the private sector, especially in the villages, with a minimum of financial and technical inputs. This guide to small-scale hatchery operations is expected to generate more enthusiasm among fish farmers interested in venturing into sugpo culture.
    • Book chapter

      Foreword - Health Management in Aquaculture 

      RR Platon - In GD Lio-Po, CR Lavilla & ER Cruz-Lacierda (Eds.), Health Management in Aquaculture, 2001 - Aquaculture Department, Southeast Asian Fisheries Development Center
    • Book chapter

      Foreword. 

      RR Platon - 2005 - Aquaculture Department, Southeast Asian Fisheries Development Center
    • magazineArticle

      Mangroves or aquaculture? Why not both? 

      ET Aldon, RR Platon & VT Sulit - Fish for the People, 2008 - SEAFDEC Secretariat
      This article briefly summarizes the techniques developed, verified and/or refined during the implementation of the Project on the Promotion of Mangrove-Friendly Shrimp Aquaculture in Southeast Asia, which was implemented by the SEAFDEC Aquaculture Department from 2000 to 2005. Conducted under the ASEAN-SEAFDEC FCG collaborative mechanism, the project which received generous funding from the Government of Japan through its JTF Program, aimed to develop sustainable culture technology packages on shrimp farming that are friendly to mangroves and the environment.
    • Article

      Organic pollution in culture water resulting from excess feed and metabolite buildup 

      OM Millamena & RR Platon - SEAFDEC Aquaculture Department Quarterly Research Report, 1977 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Penaeus monodon postlarvae were subjected to increasing feed concentrations and their growth and survival rates were recorded. Measurements were made of dissolved organic matter, and ammonia and nitrite-nitrogen concentrations. Survival was highest at the lowest feeding level and decreased as feed concentration increased. It is concluded that although organic matter enriches the food supply for P. monodon postlarvae, at higher concentration levels it can pollute the culture water, which in turn leads to mass mortality of the postlarvae. Secondly, the survival rate of P. monodon postlarvae is directly related to dissolved organic matter concentration, oxygen tension, and ammonia-nitrogen concentrations in the culture water. Even at sublethal levels these adverse environmental conditions decrease the survival rate.
    • Article

      A preliminary study on the evaluation of casein, shrimp meal, squid meal and spirulina as protein sources for Penaeus monodon (Fabricius) postlarvae 

      C Lim, P Suraniranat & R Platon - SEAFDEC Aquaculture Department Quarterly Research Report, 1978 - Aquaculture Department, Southeast Asian Fisheries Development Center
      P. monodon postlarvae were fed with fresh brown mussel (Modiolus metcalfei) meat, and artificial diets containing casein, shrimp (Metapenaeus ensis) meal, squid (Loligo) meal, and Spirulina as protein sources at a rate of 20% of their biomass per day for a period of 10 days. No statistical difference was found among the weight gains of shrimp fed on various experimental diets. However, shrimp fed squid meal diet had highest weight gain followed by shrimp meal, fresh brown mussel meat, casein and Spirulina . Shrimp fed squid meal diet had a significantly better feed conversion and those receiving other experimental diets. Poorest fed conversion was observed in shrimp fed Spirulina. The protein efficiency ratio was statistically highest for the squid meal diet, with the lowest value again for Spirulina diets. Survival rate was significantly highest for shrimp fed the shrimp meal diet. No statistical differences were found among shrimp fed other experimental diets. Appropriate data are tabulated.
    • Book chapter

      Progress of the mangrove-friendly shrimp culture project as of August 2004. 

      RR Platon - 2005 - Aquaculture Department, Southeast Asian Fisheries Development Center
      The Aquaculture Department (AQD) of the Southeast Asian Fisheries Development Center (SEAFDEC) implemented in 1998 a five-year Mangrove-Friendly Aquaculture Program covering the culture of various organisms (fishes, crustaceans and mollusks) that could have effects on the mangroves. Upon the recommendation of the 22nd SEAFDEC Program Committee in 1999, the Program was revised to focus on the effects of shrimp culture on mangroves and was placed under the FCG collaborative mechanism.

      Thus, starting in early 2000 the Program on the Promotion of Mangrove-Friendly Shrimp Aquaculture in Southeast Asia: Mangrove-Friendly Shrimp Culture Project was implemented giving due focus on shrimp and adopting the major approaches, namely verification and pilot demonstration, research, training, and information dissemination.

      The improved practices in shrimp culture in Thailand and in the Philippines served as basis for the technology verification and demonstration activities. These experiences were documented in the form of state-of-the-art manuals.
    • Conference paper

      SEAFDEC contribution to the ecological awareness of Philippine Lakes 

      RR Platon - In National Seminar-Workshop on the Conservation and Ecological Management of Philippine Lakes in Relation to Fisheries and Aquaculture (1997 : Innotech, Diliman, Quezon City), 2001 - Aquaculture Department, Southeast Asian Fisheries Development Center; Philippine Council for Aquatic and Marine Research and Development; Bureau of Fisheries and Aquatic Resources
      Since 1976 the Aquaculture Department of the Southeast Asian Fisheries Development Center (SEAFDEC/AQD), through its Binangonan Freshwater Station has been continuously involved in research on various aspects of inland waters, with emphasis on Laguna de Bay. Lakes Paoay, Taal, Sampaloc and Naujan have also been studied to a limited extent. Research efforts focused on monitoring activities of various biological and physico-chemical parameters in the lake; pollution studies; improvement of practices towards an environmentally sound and sustainable aquaculture enterprise; socio-economic impacts of aquaculture on lakeshore communities and other related activities. The Department has been actively collaborating with various national and international agencies as well as non-government organizations in its effort, to improve its research capabilities. The research results have been published in both local and international scientific journals and proceedings.
    • Conference paper

      Shrimp aquaculture: the Philippine experience 

      RR Platon - In PT Smith (Ed.), Towards Sustainable Shrimp Culture in Thailand and the Region. Proceedings of a workshop held at Hat Yai, Songkhla, Thailand, 28 October-1 November 1996, 1999 - Australian Centre for International Agricultural Research
      Series: ACIAR Proceedings; No. 90
      An overview is presented of the shrimp farming industry in the Philippines, noting that it was established as brackish-water aquaculture as early as 1521, although it took until the 1970s to take off, blooming during the 1980s, and then stagnating and even declining during the 1990s. Issues discussed are: a brief status of the shrimp aquaculture industry (farm production and exports; hatcheries, processors and feed mills); current key constraints (technical constraints to fry production; technical constraints to the grow-out operation; environmental constraints; social constraints; economic constraints; and political and administrative constraints); and research activities and priorities for future research.
    • magazineArticle

      Towards sustainable aquaculture in the ASEAN region 

      RR Platon, WG Yap & VT Sulit - Fish for the People, 2007 - SEAFDEC Secretariat