Now showing items 1-5 of 5

    • Book

      Biology and culture of sea bass (Lates calcarifer) 

      P Kungvankij, LB Tiro Jr., BJ Pudadera Jr. & IO Potestas - 1986 - Network of Aquaculture Centres in Asia
      Series: Aquaculture extension manual; No. 11
      Information is presented regarding the biology and culture of Lates calcarifer in order to serve as a practical guide for extension workers and farmers. Hatchery design, seed production and hatchery techniques, culture of seabass and financial aspects of the seabass culture industry are described.
    • Conference paper

      Induced spawning and larval rearing of grouper (Epinephelus salmoides Maxwell) 

      Broodfish of grouper (Epinephelus salmoides ) were induced to spawn by hormonal induction. The hormones used for this experiment were HCG + pituitary gland (PG) and LRH-a. The results showed that at dosages of 500 IU HCG + 3 mg of PG per kg of fish for first injection and 1,000 IU HCG + 3 mg of PG per kg of fish at the final injection at an interval of 24 hours, the treated fish spawned naturally in a spawning tank 12 hours after the final injection. At lower dosages of 500 IU HCG + 3 mg PG at 12-hour intervals or 500 IU HCG + 3 mg PG at 24-hour intervals or using 10 mg LRH-a at 12-hour intervals, the eggs can be artificially fertilized only by stripping. The larval rearing experiment was conducted in a 250-l fiberglass tank at the stocking density of 2,500 larvae per tank. Feeds used in this experiment were: (a) Isochrysis + sea urchin eggs; (b) Isochrysis + Brachionus ; and (c) Tetraselmis + Brachionus . The results showed that newly hatched larvae fed with Isochrysis mixed with sea urchin eggs and then Brachionus from day 10 had the best survival rate (9% at day 30).
    • Conference paper

      Induced spawning and larval rearing of grouper (Epinephelus salmoides Maxwell) 

      P Kungvankij, LB Tiro Jr., BJ Pudadera Jr. & IO Potestas - In JL Maclean, LB Dizon & LV Hosillos (Eds.), The First Asian Fisheries Forum: proceedings of the First Asian Fisheries Forum, Manila, Philippines, 26-31 May 1986, 1986 - Asian Fisheries Society
      Broodfish of grouper (Epinephelus salmoides ) were induced to spawn by hormonal induction. The hormones used for this experiment were HCG + pituitary gland (PG) and LRH-a. The results showed that at dosages of 500 IU HCG + 3 mg of PG per kg of fish for first injection and 1,000 IU HCG + 3 mg of PG per kg of fish at the final injection at an interval of 24 hours, the treated fish spawned naturally in a spawning tank 12 hours after the final injection. At lower dosages of 500 IU HCG + 3 mg PG at 12-hour intervals or 500 IU HCG + 3 mg PG at 24-hour intervals or using 10 mg LRH-a at 12-hour intervals, the eggs can be artificially fertilized only by stripping. The larval rearing experiment was conducted in a 250-l fiberglass tank at the stocking density of 2,500 larvae per tank. Feeds used in this experiment were: (a) Isochrysis + sea urchin eggs; (b) Isochrysis + Brachionus ; and (c) Tetraselmis + Brachionus . The results showed that newly hatched larvae fed with Isochrysis mixed with sea urchin eggs and then Brachionus from day 10 had the best survival rate (9% at day 30).
    • Conference paper

      Intensification techniques in the extensive culture of Penaeus monodon 

      LB Tiro, BJ Pudadera, IO Potestas & P Kungvankij - 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
      Traditional shrimp (Penaeus monodon) farming is characterized by low yields, 100-300 kg/ha/yr. To provide farmers with appropriate technology that can immediately improve pond yield with minimal investment, experiments were conducted in brackishwater earthen ponds in two phases. The first phase was to evaluate the optimum stocking density without transfer of stock during the culture period up to harvest time. In the second phase, the best stocking density in the first phase was selected to determine the effect of transfer to newly-prepared ponds at 45-day and 60-day intervals. In the first phase, the ponds were stocked with hatchery-bred fry at the stocking rates of 1, 2 and 4/m2 with no supplementary feeding for the first two months of culture. Feed was introduced after the second month at 6% body weight for the third month and at 4% body weight on the fourth. The yields after four months were 171 kg., 317 kg and 382 kg/ha/crop with survival rates of 85%, 83% and 74%, respectively. The stocking density of 2/m2 was selected for the second phase experiment. The yield was 422 kg, 525 kg and 372 kg/ha/crop at 45 days and 60 days transfer and nontransferred, respectively.
    • Book

      Shrimp hatchery design, operation and management 

      P Kungvankij, LB Tiro Jr., BJ Pudadera Jr., IO Potestas, KG Corre, EL Borlongan, GA Talean, LF Bustilo, ET Tech, A Unggui & TE Chua - 1986 - Network of Aquaculture Centres in Asia
      Series: Aquaculture extension manual; No. 14
      Details are given of factors to be taken into account for successful hatchery operation. The following aspects are covered: 1) site selection; 2) hatchery design and construction; 3) life cycle; 4) preparation of broodstock for spawning; 5) larval feed; 6) spawning, hatching and larval rearing facilities; 7) spawner selection and egg collection 8) nauplii hatching and transportation; 9) larval rearing; 10) routine hatching, management; 11) port-larvae nursery; and 12) larval harvesting and transportation.