Now showing items 1-4 of 4

    • Article

      The effect of background color and rotifer density on rotifer intake, growth and survival of the grouper (Epinephelus suillus) larvae 

      MN Duray, CB Estudillo & LG Alpasan - Aquaculture, 1996 - Elsevier
      Rotifer intake and early growth and survival of Epinephelus suillus larvae were determined in terms of rotifer visibility against the background color of rearing tanks and density. The larvae were stocked at 30 l−1 in 200-l fiberglass tanks with phytoplankton (green water). Larvae were fed rotifers at densities of 5, 10 and 20 ml−1. Growth and survival were comparable among larvae in both tan and black tanks with green water. Rotifer intake was significantly higher in larvae in tan tanks. In black tanks, the survival of larvae at Day 14 was enhanced by the high rotifer density of 20 ml−1. Rotifer intake and growth of larvae were similar at all densities.
    • Article

      Improved hatchery rearing of mangrove red snapper, Lutjanus argentimaculatus, in large tanks with small rotifer (Brachionus plicatilis) and Artemia 

      MN Duray, LG Alpasan & CB Estudillo - The Israeli Journal of Aquaculture-Bamidgeh, 1996 - Society of Israeli Aquaculture and Marine Biotechnology
      A hatchery rearing scheme for the red snapper, Lutjanus argentimaculatus, is described. The feeding regime consisted of Chlorella, Brachionus, Artemia and minced fish. The average survival rate at day 24 was 27% in 3-ton tanks but only 3% in 0.5-ton tanks. From an initial length of 2.15 mm at stocking, larvae grew to 8.2 mm on day 24 and 30.6 mm on day 55. Growth and survival were best when larvae were fed screened Brachionus (<90 μm) during the first 14 days. Larvae fed Artemia at 1, 2 and 3 per ml per day weighed similarly on day 35 but were longer at the higher feeding levels and survived better at the lower levels. Larvae fed Artemia at 2 per ml had a higher survival when the ration was given four times a day rather than 1-2 times a day.
    • Article

      Larval rearing of the grouper Epinephelus suillus under laboratory conditions 

      MN Duray, CB Estudillo & LG Alpasan - Aquaculture, 1997 - Elsevier
      A protocol for rearing orange-spotted rockcod, Epinephelus suillus in the hatchery is described. The feeding regime consisted of Chlorella, Brachionus, Artemia and minced fish. With this regime, survival rates at Day 24 were 19.8% in 3-ton tanks and only 7.4% in 0.5-ton tanks. From an initial length of 1.62 mm on Day 0, larvae grew to 10.94 mm on Day 24 and 51.4–65.1 mm on Day 60. Larval growth and survival rate were improved when larvae were fed screened (less than 90 μm) Brachionus during the first 2 weeks. Survival was even better among larvae fed Brachionus until Day 35. Artemia, at a density of 3 ml−1, given once daily to larvae in 24 ppt seawater improved growth and survival.
    • Conference paper

      Optimum stocking density and tank size for larval rearing of the grouper, Epinephelus coioides 

      MN Duray, CB Estudillo & LG Alpasan - In The Fourth Asian Fisheries Forum: Proceedings of the Fourth Asian Fisheries Forum, Beijing, 16-20 October 1995, 1997 - Asian Fisheries Society
      The effect of stocking of stocking density and tank size on early growth and survival of grouper, Epinephelus coioides (=suillus) larvae were determined. In one experiment, larvae were stocked in 500L tanks at densities of 5, 10, 20 and 30 per liter and fed rotifers at 15 ind/mL. After 21 d, larvae attained best growth (9.6 mm) and highest survival (32.2%) at 20/L. In another experiment, larvae were stocked at 30/L in 40 L, 200 L and 500 L circular fiberglass tanks. Survival was highest in 500 L (22.3%) and lowest in 40 L tanks (0.5%), but larvae in 200 L tanks were larger (8.2 mm total length, 1.5 mg dry weight) on day 21. Thus in small tanks, 20 larvae/L is the optimum stocking density. In larger tanks of 500 L, 30 larvae/L is feasible.