Now showing items 1-4 of 4

    • Article

      The biology and control of Caligus sp., an ectoparasite of the adult milkfish Chanos chanos Forskal 

      EM Laviña - SEAFDEC Aquaculture Department Quarterly Research Report, 1977 - Aquaculture Department, Southeast Asian Fisheries Development Center
      One unidentified species of copepod belonging to the genus Caligus of the family Caligidae was found to infest the adult milkfish broodstock. To control the parasites infesting the adult milkfish, tests were made using the chemical (2,2,2-trichloro-1-hydroxyl)-phosphonic acid-dimethylethol (Neguvon) at a concentration of 0.25 ppm. It is noted that a concentration of 0.25 ppm of Neguvon maintained for 12-24 hours in the sabalo-containing tanks in a closed water system but with aeration is effective in controlling the parasites. Fish mortality during the experiment was due to inadequate aeration in the tanks.
    • Article

      Decapsulation of Artemia cysts: A simple technique for the improvement of the use of brine shrimp in aquaculture 

      P Sorgeloos, E Bossuyt, EM Laviña, M Baeza-Mesa & G Persoone - Aquaculture, 1977 - Elsevier
      Although it is a common practice in different disciplines of fundamental research on the brine shrimp, and despite the very interesting applications that it offers for the use of Artemia in aquaculture, the "decapsulation" technique, which removes the outer layer of the cyst shell of Artemia, is not known to shrimp and fish aquaculturists.

      The present paper describes the technology developed by the authors for the routine decapsulation of Artemia cysts. The advantages which result from the use of decapsulated cysts in aquacultural hatcheries are discussed.
    • Article

      A study on certain aspects on the biology and control of Caligus sp., an ectoparasite of the adult milkfish Chanos chanos (Forskal) 

      EM Laviña - Fisheries Research Journal of the Philippines, 1978 - Fisheries Research Society of the Philippines
      One unidentified species of copepod belonging to the genus Caligus was found to infest the adult milkfish broodstock kept in canvas tanks at the SEAFDEC research station in Mag-aba, Pandan, Antique, Philippines. This report describes the morphology of the adult and early larval stages of this copepod. A highly effective method of control using the chemical Neguvon (2,2,2-trichloro-1-hydroxyl-phosphoric acid-dimethylethol) at a concentration of 0.25 ppm is recommended.
    • Conference paper

      Successful inoculation of Artemia and production of cysts in man-made salterns in the Philippines 

      C de los Santos Jr., P Sorgeloos, A Bernardino & EM Laviña - In G Persoone, P Sorgeloos, O Roels & E Jaspers (Eds.), The Brine Shrimp Artemia. Proceedings of the International Symposium on the brine shrimp Artemia salina, Corpus Christi, Texas, USA, August 20-23, 1979., 1980 - Universa Press
      The objective of the inoculation described in this paper was to test the feasibility of culturing Artemia in man-made earthen salterns and of producing adults and cysts for use in aquaculture projects in the Philippines. San Francisco Bay (California, USA) Artemia were inoculated in two concrete tanks and in four earthen ponds which are part of a small local salt factory.

      It was found that Artemia can be grown (with continuous production of nauplii and cysts) year-round in covered concrete tanks and in open concrete tanks and earthen ponds during the dry season (February to June). Lethal effects of too high water temperatures (>35°C) to the cultures were anticipated by the use of green coconut fronds placed on the water surface alongside the walls of the tanks and the earthen dikes.

      Rice bran enriched with vitamins and traces of minerals appeared to be a good food for Artemia cultured in aerated concrete tanks; in the earthen salt ponds the brine shrimp grew well on the natural food present.

      Over a 3 month production period, 26 kg dry weight cysts and 150 kg live weight adults have been harvested from a total surface of 1.7 ha of salt ponds and brine tanks.