Now showing items 1-4 of 4

    • Article

      An economic analysis of the modular pond system of milkfish production in the Philippines 

      RF Agbayani, DD Baliao, NM Franco, RB Ticar & NG Guanzon Jr. - Aquaculture, 1989 - Elsevier
      In 1980, the annual yield of milkfish ponds in the Philippines was 800 kg/ha while the potential yield is estimated to be 2000 kg/ha. The modular pond system analyzed in this study can largely close the gap between actual and potential yield through more efficient use of pond capacity to increase the number of croppings up to 7 times in 1 year. Pilot-scale production using the modular pond system was done at the Leganes Research Station (LRS) SEAFDEC, Iloilo, and at three cooperating commercial farms. Scale of operation ranged from 2.7 ha to 7.9 ha. From 2 to 7 production runs were recorded with per hectare outputs ranging from 278 kg to 341 kg per run. Input costs were based on actual figures and the ex-farm milkfish price as P21.00 (4 to 6 fish/kg). The average return on investment and payback period for all sites was 68.81% and 1.25 years, respectively.
    • Article

      Effect of stocking density and duration on stunting milkfish fingerlings in ponds 

      DD Baliao, RB Ticar & NG Guanzon Jr. - Journal of Aquaculture in the Tropics, 1986 - Taylor & Francis
      The paper discusses the effect of stocking density and holding periods in stunting milkfish fingerlings in brackishwater ponds using twelve units of 144m2 earthen ponds. With 15, 20, and 25 fingerlings/m2 growth and survival rates were not significant (P<0.05) averaging 13.60g and 83.47%, respectively. Lowest survival (54.52%) and growth rates (10.80g) were obtained in treatment with highest density level of 30 fingerlings/m2. Using the density of 20 fingerlings/m2 different stunting periods of 6, 9, and 12 months were tried. Survival and growth rates were not significant for 6 and 9 months stunting periods averaging 79.98% and 13.21 g. At longest (12 months) stunting period however survival was lowest (52.05%).

      In stunting milkfish fingerlings, a density of 15 to 25 pcs/m2 could be tried at a stunting period of 6 to 9 months in order to obtain an optimum survival of 81.7% and growth rate of 13.4 g.
    • Book

      Grouper culture in brackishwater ponds 

      DD Baliao, MA de los Santos, EM Rodriguez & RB Ticar - 1998 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Series: Aquaculture extension manual; No. 24
      Groupers (Epinephelus) are cultured in the Philippines using tiny fry and juveniles caught from the wild. A SEAFDEC/AQD technology verification study on grouper pond grow-out culture resulted in high productivity and profitability, indicating that grouper culture could become another income source for the country. This aquaculture extension manual is intended as a guide for fishfarmers and aquaculturists, extensionists, and students of aquaculture. It covers the following areas: What are groupers?; Commercially important groupers; Source of fry or fingerlings; Common collection gears for fry/juveniles; Brackishwater pond culture -- pond specifications, site selection, pond preparation, nursery operation, grow-out culture, harvest, post-harvest; Growth, survival and feed efficiency performance of grouper reared in brackishwater pond; Economics; Marketing and transport; and, Diseases.
    • Article

      Nursery rearing of Penaeus monodon (Fabricius) using suspended (hapa) net enclosures installed in a pond 

      EM Rodriguez, I Bombeo-Tuburan, S Fukumoto & RB Ticar - Aquaculture, 1993 - Elsevier
      The use of suspended (hapa) nets as nursery enclosures for shrimp fry was tested. In the first trial, four stocking densities (72, 144, 288, and 432 fry m−3) of P. monodon fry (PL20, body weight = 8 mg, body length = 12.6 mm) were evaluated in 1×1×1.5 m hapa nets. Results showed that shrimp BW, BL, and survival rates were inversely related to stocking density. Shrimp fry stocked at 72 fry m−3 attained significantly greater BL of 22 and 37 mm and BW of 50 and 260 mg after 15 and 30 days, respectively, and survival of 92%. A verification trial using PL28 (BW = 10 mg, BL = 13.2 mm) at a stocking density of 288 fry m−3 in hapa nets of 2×3×1.5 m yielded a mean survival of 97%, BL 48.1 mm, and BW 780 mg. Hapa nets are therefore useful as alternative shrimp fry nursery systems in the absence of specialized tanks or pond nursery facilities.