The Quarterly Research Report is published by SEAFDEC Aquaculture Department for the research work of its researchers and their staff, and of its research staff on graduate or postgraduate studies. This includes Extended Abstracts, Notes and Study Updates.

Recent Submissions

  • Article

    Effect of varying crude protein levels on spawning frequency and growth of Sarotherodon niloticus breeders 

    CB Santiago, M Bañes-Aldaba & MA Laron - SEAFDEC Aquaculture Department Quarterly Research Report, 1981 - SEAFDEC Aquaculture Department
    Four-month-old S. niloticus breeders were fed with dry pellets containing 20-50% crude protein and the frequency of spawning involving removal of egg from the mouthbrooding females and growth were determined. When the diets contain high quality proteins from fish meal and soybean oil meal and the amounts of daily food allowance are at satiation level, the influence of increasing dietary crude protein on spawning frequency involving egg removal from the brooder and growth may not be significant.
  • Article

    Effects of exogenous hormone injections on milt consistency in newly caught, wild milkfish 

    JV Juario, GF Quinitio, J Banno & M Natividad - SEAFDEC Aquaculture Department Quarterly Research Report, 1981 - SEAFDEC Aquaculture Department
    A study was conducted to determine the effects of single injections of human chorionic gonadotropin (HCG) and Durandron Forte 250 on sperm motility, vitality and density and also on the consistency of milt in newly caught, wild, mature milkfish (Chanos chanos). In contrast to HCG, single injections of Durandron Forte 250 were effective not only in inducing spermiation but also in maintaining newly caught mature males in good running condition for a maximum of 7 days, despite daily handling and collection of approximately 3ml milt.
  • Article

    Gum arabic, carrageenan of various types and sago palm starch as binders in prawn diets 

    FP Pascual & A Sumalangcay - SEAFDEC Aquaculture Department Quarterly Research Report, 1981 - SEAFDEC Aquaculture Department
    An experiment was undertaken in order to investigate the use of sago palm starch, gum arabic and carrageenans as binders in prawn diets. Water stability data are presented; EPT-2 carrageenan was found to be the best binder for both steamed and unsteamed pellets.
  • Article

    Preliminary studies on predicting the setting season of oysters for the benefit of shellfish farmers 

    AL Young, E Gargantiel & R Traviña - SEAFDEC Aquaculture Department Quarterly Research Report, 1981 - SEAFDEC Aquaculture Department
    Preliminary findings from a spatfall forecasting programme initiated in April 1981 at Himamaylan River, Negros Occidental are presented. Two main activities are involved: 1) monitoring of daily counts of oyster larvae in the plankton; and 2) monitoring of actual setting of oysters on standardized collectors put in the vicinity of oyster farm sites. Findings indicate that when the count of mature larvae exceeds 5 per 100 ml sample and persists for at least 3 days, spat may be expected to occur shortly afterwards.
  • Article

    Acute toxicity of un ionized ammonia to milkfish (Chanos chanos) fingerlings 

    ER Cruz - SEAFDEC Aquaculture Department Quarterly Research Report, 1981 - SEAFDEC Aquaculture Department
    The acute toxicity of un-ionized ammonia to milkfish (Chanos chanos) fingerlings was determined using a static bioassay system. Median lethal concentrations found show that milkfish fingerlings have a high tolerance to ammonia and it is unlikely that levels as high as those employed for the acute exposure would be found to occur under natural conditions. Although the threat of acute toxicological effects induced by ammonia are remote, such conditions might be encountered in stressed natural environments or in heavily loaded aquaculture systems.

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