Browsing by Author "Gapasin, Rolando S. J."

Now showing items 1-3 of 3

    • Book

      Abalone hatchery 

      AC Fermin, MR de la Peña, RSJ Gapasin, MB Teruel, SMB Ursua, VC Encena II & NC Bayona - 2008 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Series: Aquaculture extension manual; No. 39
      This manual contains information on abalone hatchery operation, including site selection, design, culture of natural food, broodstock management, spawning, nursery, packing and transport, and profitability analyses.
    • Book

      Milkfish hatchery operations 

      RSJ Gapasin & CL Marte - 1990 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Series: Aquaculture extension manual; No. 17
      The manual is intended primarily for practicing prawn hatchery operators who would like to diversify their operations to include larval rearing of milkfish (Chanos chanos). Only those procedures important in the daily operations of a milkfish hatchery are described in detail, under the following headings: Essential facilities - tanks and equipment; Production of natural food - Chlorella culture and Brachionus culture; Production of milkfish fry - preparation of hatching and larval rearing tanks, hatching of milkfish eggs, stocking of larvae, larval rearing, and harvesting.
    • Conference paper

      Postlarvae density and photoperiod effects on the settlement and metamorphosis of the donkey's ear abalone, Haliotis asinina Linne, 1758 

      AC Fermin & RSJ Gapasin - In J Hylleberg (Ed.), Proceedings of the 10th International Congress and Workshop of the Tropical Marine Mollusc Programme (TMMP), 20-30 October 1999, 2000 - Phuket Marine Biological Center
      The effects of photoperiod and density of postlarvae on settlement and metamorphosis of the native abalone, Haliotis asinina were determined in two separate experiments. Abalone larvae were hatched from spontaneously spawned eggs of tank-held broodstock. Experiments were conducted in static water conditions within a 10 day-period. Post-larvae held under at 24 h light regime showed higher settlement rates (mean: 12 %) than did larvae held at different light-and-dark periods (range: 3-9 %). Larvae kept in the dark had the lowest survival (3 %). Postlarvae stocked at lower stocking densities of 100 and 150 l -1 had higher settlement rates (12-12.5 %) than postlarvae stocked between 200 and 600 postlarvae l -1 (1-5 %).