Now showing items 1-8 of 8

    • 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) 

      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.
    • Conference paper

      The occurrence of milkfish Chanos chanos fry in Pandan Bay, Antique, from 21 May to 25 June, 1975 

      S Kumagai, AC Villaluz, LB Tiro Jr. & WE Vanstone - In Proceedings of the International Milkfish Workshop Conference, May 19-22, 1976, Tigbauan, Iloilo, Philippines, 1976 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Milkfish fry were collected at the Pandan shoreline and 500 meters offshore. While shore-caught fry were uniform in size those captured offshore varied in size and stage of development.
    • Book

      A prototype warm water shrimp hatchery 

      P Kungvankij, LB Tiro Jr., BJ Pudadera Jr., E Borlongan, ET Tech & TE Chua - 1989 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Series: NACA technology series; No. 4
      A description is given of the prototype warm water shrimp hatchery established and operated by SEAFDEC Aquaculture Department since 1982. Hatchery design, operation and management, larval rearing in small indoor tanks, larval rearing in large nursery tanks, routine hatchery management, harvesting and transportation and financial aspects are covered.
    • 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.
    • Conference paper

      Spawning of milkfish, Chanos chanos, in captivity 

      WE Vanstone, AC Villaluz & LB Tiro Jr. - In Proceedings of the International Milkfish Workshop Conference, May 19-22, 1976, Tigbauan, Iloilo, Philippines, 1976 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Newly captured milkfish released 0.8 mm in diameter non-hydrated eggs spontaneously in captivity. After injection with partially purified salmon gonadotropin (SG-G100), 1.2 mm in diameter hydrated eggs were released. These eggs, however, were not fertilized.
    • Article

      Studies on the digestive proteases of the milkfish Chanos chanos 

      LV Benitez & LB Tiro Jr. - Marine Biology, 1982 - Springer
      The protease activity of crude extracts from various organs of the digestive tract of two groups of milkfish was determined. One group (Sample A) derived their food from ponds that had predominantly unicellular algae while the other group (Sample B) were reared on ponds dominated by the filamentous green algae Chaetomorpha brachygona . In general, crude extracts from Sample A fish had a higher protease activity than Sample B fish. In both samples, high protease activity was observed in crude extracts from the pyloric caeca, intestines and pancreas. Chymotryptic activity was observed in crude extracts of pancreas, intestines and pyloric caeca of both fish samples. Tryptic activity was, however, observed only in fish grown on unicellular algae. Experimental evidence suggests that a powerful trypsin inhibitor in Chaetomorpha brachygona may account for the absence of tryptic activity in all crude extracts of Sample B fish. The presence of this inhibitor may also explain the widely observed poor growth rate of milkfish reared on this natural food.