Now showing items 1-6 of 6

    • Article

      Cloning of IGF-I, IGF-II and IGF-IR cDNAs in mullet (Mugil cephalus) and grouper (Epinephelus coioides): Molecular markers for egg quality in marine fish 

      J Gonzaga, A Anderson, N Richardson, J Nocillado & A Elizur - Asian Journal of Biological Sciences, 2010 - Knowledgia Scientific
      The putative cDNA sequence of insulin like growth factor (IGF)-I, IGF-II and IGF-IR (receptor) was determined from the tissues of mullet, Mugil cephalus and grouper Epinephelus coioides. The deduced partial coding sequences were deposited at Gene Bank (Accession No. AY427954, AY427955, AY772254, AY776158, AY776159, AY772255). These basic data were used to determine messenger ribonucleic acid (mRNA) levels during embryogenesis in the two species. Results showed that IGF-II has the highest expression ratio and makes it a potential marker for egg quality in the two cultured species.
    • Article

      Effects of antioxidants on feed quality and growth of Penaeus monodon juveniles 

      MN Bautista, PF Subosa & CR Lavilla-Pitogo - Journal of the Science of Food and Agriculture, 1992 - Wiley-Blackwell
      Four practical diets were formulated to contain 0.05%, of the following antioxidants: butylated hydroxytoluene (BHT), butylated hydroxy anisole (BHA), propyl gallate (PG) or ethoxyquin (ETHQ). A fifth diet, with no added antioxidant, served as a control. The diets were fed to Penaeus monodon juveniles to determine the effects of antioxidants on feed quality and growth of the animals. The results showed no significant difference (P> 0.05) between the control and the feeds containing antioxidants in 2-thiobarbituric acid values after 0, 30, 60, and 90 days storage, respectively. There was a significant difference by the 120th day of storage, but no signs of physical deterioration were observed in any of the diets. The highest weight gains (704% and 742%) were obtained with shrimps fed diets with BHT and BHA, respectively, as antioxidants. Hepatopancreatic lesion formation was evident with shrimps fed diets containing antioxidants but not with shrimps fed a diet without antioxidant. Shrimps fed with BHT-added feed showed fewest lesions in the hepatopancreas. Although all shrimp samples given feed containing PG and ETHQ showed lesions, these were patchy in nature and did not affect the growth rates of the animals.
    • magazineArticle

      Food safety through HACCP 

      RIY Adan - SEAFDEC Asian Aquaculture, 2000 - Aquaculture Department, Southeast Asian Fisheries Development Center
    • Article

      Growth and agar quality of Gracilaria heteroclada (Zhang et Xia) grown in a filter tank 

      MRJ Luhan, F Harder & AQ Hurtado - Philippine Agricultural Scientist, 2006 - College of Agriculture, University of the Philippines Los Baños
      Gracilaria heteroclada Zhang et Xia was grown in filter tanks to determine the growth, agar quality and uptake pattern of nitrogen and to observe the water quality in recirculating water system with seaweed.

      Rapid uptake of nitrogen in G. heteroclada was observed within the first 24th of culture. Filling up of the nitrogen pools in the cell may have continued until the fifth day, the plants started to increase in weight, proportionate to the uptake rate of nitrogen duing the experiment. G. heteroclada stocked at 1 kg m-2achieved a specific growth rate (SGR) of approximately 10.4% d-1 during 15d of culture, at total ammonia-nitrogen and nitrite-nitrogen levels of 0.03-0.27 mg L-1 and 0.04-0.19mg L-1, respectively, in the filter tank. Approximately 11% of nitrogen in the water was removed by the seaweed.
    • Article

      The interactive effect of some environmental factors on the growth, agar yield and quality of Gracilariopsis bailinae (Zhang et Xia) cultured in tanks 

      AQ Hurtado-Ponce & HB Pondevida - Botanica Marina, 1997 - Walter de Gruyter
      The single and interactive effects of light and temperature, salinity, and urea enrichment on the growth and agar yield and quality of Gracilariopsis bailinae were determined under indoor and outdoor tank conditions. Culture period was 6 weeks. Growth rate reached its peak on the second week in all culture conditions and gradually decreased towards the end of the culture period. Higher growth rates were obtained in seaweed cultured in outdoor (0.27-1.12% day-1) than in indoor (0.21-0.72% day-1) tanks; with urea enrichment and lower salinity levels (15-25ppt). A significant interactive effect was demonstrated between and among the environmental parameters on the growth of the seaweed. Highest gel strength (870 g cm-1) and lowest sulfate content (3.1 µg mg-1) were obtained at 25ppt, without urea enrichment and in indoor tanks. A significant interactive effect of light intensity and temperature-urea enrichment was ascertained on agar yield; also of light intensity and temperature-salinity on gel strength and sulfate content. Positive and negative correlation was likewise established between agar properties.
    • Article

      Quality assessment of newly hatched mud crab, Scylla serrata, larvae 

      ET Quinitio, JJ dela Cruz-Huervana & FD Parado-Estepa - Aquaculture Research, 2018 - Wiley
      Starvation and exposure to formalin were investigated as possible stress tests for evaluating the quality of mud crab, Scylla serrata, larvae. For the starvation stress test, newly hatched zoeae stocked in 150-ml containers were either starved or fed rotifers. Similarly, newly hatched zoeae were stocked in containers with seawater of 0 (control), 20, 30 and 40 mg/L formalin for the formalin stress test. The zoeae from the same batches were used for seed production to monitor their performance and validate the results of stress tests. Starvation was found to be unsuitable for larval quality evaluation. However, the impact of initial food deprivation on the newly hatched larvae indicates that feeding immediately after hatching is necessary for mud crab larvae. Exposure of larvae to 40 mg/L formalin for 3 hr appeared to be a reliable and practical method for larval quality assessment as the survival of larvae in the mass production tanks validated the classification of good and poor quality batches in the stress tests. On this basis, a hatchery operator can decide which batch should be cultured further. Finally, there appears to be a link between the quality of larvae and the performance at the megalopa and early juvenile crabs.