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A preliminary study of hydrogen sulphide toxicity on juveniles of Macrobrachium rosenbergii (de Man)

Establishment of a Network of Aquaculture Centres in Asia








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    Preliminary studies on the effect of methyltestosterone on Macrobrachium rosenbergii juveniles (Crustaceana: Palaemonidae)
    Establishment of a Network of Aquaculture Centres in Asia
    1986
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    Macrobrachium rosenbergii juveniles were fed hormone-free and hormone-treated diets at 30% crude protein. Methyltestosterone (MT) was incorporated in the diets at 3 levels (25 mg MT/ kg feed, 75 mg MT/kg feed and 125 mg MT/kg feed and administered for 60 days. Growth in all treatments after 30 days post-hormone treatment showed no significant differences (P 0.05) while sex ratios were significantly different in 3 treatments : control v diet I (25 mg MT/ kg feed); diet I v diet IV (125 mg MT/kg f eed) (P¡Ý 0.05). As artificial control of growth and monosex cultures through hormones are possible tools in any cultural management, this preliminary study may inspire further exploration along these lines particularly on the culture of the giant freshwater prawn. 1 Research conducted under the FAO/NACA Secondment for Young Scientists Program Bangkok, Thailand October 1985-September 1986. 2 Research Associate-Southeast Asian Fisheries Development Center (SEAFDEC - AQD) Binangonan Research S tation Binangonan, Rizal Philippines 3106.
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    The potential of farming tilapia (Oreochromis niloticus) and freshwater prawn (Macrobrachium rosenbergii) in Vanuatu 2004
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    Under the auspices of the Food and Agriculture Organization of the United Nations (FAO) Sub-Regional Office for the Pacific Islands (SAPA) in Samoa, a feasibility study on farming tilapia and prawns was undertaken by SPC Aquaculture Office in November 2003. The objectives were to survey the potential to develop Tilapia (Oreochromis niloticus) and Prawn (Macrobrachium rosenbergii) farming in Vanuatu (further details are given in the Terms of References in Appendix 2).
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    Production, yield characteristics and economics of polyculture of Macrobrachium rosenbergii and various fish species under pond condition
    Establishment of a Network of Aquaculture Centres in Asia
    1986
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    The effect of two densities of freshwater prawn Macrobrachium rosenbergii on production,yield eristics and economics under polyculture system were examined in four ponds of 1.75 rai each during seven months growing period.Prawns stocked at about 2 (L.D) and 5 (H.D) tails per sq.m with the average weight of 3–4 g.Fish stocked in each ponds are as follows:225,500,350 and 1250 tails per pond for common carp,giant gouramy,bighead and silver carp respectively.The average production of fish in L.D and H.D amounted to 2,295 and 2,125 kg per ha respectively.Common carp had a highest growth,while silver carp and bighead were the lowest.There was an indication that the production in H.D was higher.The average production of prawn in L.D and H.D reached 722 and 910 kg per ha.It is considered that the stocking rate of common carp should be lower,since the pond productivity was not enough to support the growth of silver carp and bighead carp.It is observed that the production of fish was not affecte d by the different stocking densities of prawn.The survival rate of common carp was the highest(92%),followed by bighead carp (83%& 93%),silver carp (89% & 80%)and giant gouramy (76%& 73%).For the prawn it ranged from 49.1–61.1%,except one replicate in L.D which comprised 95%. This may probably be due to second restocking. The F.C.R of fish,based on the F.C.R of prawn (2.5),were 0.85 and 1.12 respectively in L.D and H.D.The average weight (g) of male prawn ranged widely in each category (43–102 g) compared to female prawn (29–51 g). The percentage in number of female prawn ranged 65–72% in both L.D and H.D. There is a positive relationship between stocking density and the percentage both in number ans weight of female prawn as well as the marketable yield. The marketable yield comprised about 87% of total biomass both in L.D and H.D.***

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