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Optimum dietary protein requirement for Macrobrachium rosenbergii juveniles

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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    A preliminary study of hydrogen sulphide toxicity on juveniles of Macrobrachium rosenbergii (de Man)
    Establishment of a Network of Aquaculture Centres in Asia
    1986
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    Static bio-assays were performed for 96-hour period to determine the mean lethal concentrations (LC50) of hydrogen sulphide toxicity on juveniles of Macrobrachium rosenbergii. Two broods were tested and LC50 values were determined for 24, 48, 72 and 96 hours The LC50 values were 6.36, 4.25, 3.09 and 2.57 mg/l H2S for brood l and 5.57, 4.79, 4.25 and 4.20 for brood 2 respectively, for 24, 48, 72 and 96 hours. The safe concentration of hydrogen sulphide determined for juveniles of M. rosenbergii w as 0.26 mg/l.
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    The culture of the giant freshwater prawn (Macrobrachium rosenbergii de Man) in Cuba. Report of the first technical assessment mission, May 7th - 30th 1990 1990
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    The Cuban government wish to expand the tourist industry as a sorce of much needed foreign exchange. Opportunites to supply and support the industry are actively being sought and include the provision of fish and shellfish foods from fisheries and aquaculture to supply the hotel and restaurant enterprises throughout the designated tourist areas. The culture of the Giant Freshwater prawn (Macrobrachium rosenbergii) is one such Trials are being made with pond reared stock using three methods to improve breeding; i) eyestalk ablation; ii) photoperiod manipulation; iii) artificial insemination. In the hatchery larvae are fed algae followed by minced clam, squid, marine fish and Artemia but Nippai prepared feeds are also used. A nursery phase is employed lasting 30–40 days which takes the shrimp from 5–10 day old post-larvae to 0.5 to 1.0 g juveniles. Stocking rate is 100/sq m but trials, have been made with 1000–2000 in 70 t tanks. In the on-growing phase shrimp are stocked at 5/m2, feed is given at from 15 to 2.5% per day and salinity is 25%. Feed costs around 200–250 pesos per tonne and contains squid, shrimp meal (from processed P. schmitti caught at sea) and zeolite. Problems with unstable artificial feed are common. Production is around 400–500 kg/ha/cycle and at present there are 1.6 to 1.7 cycles/yr. Newness of the ponds, inexperience and climatic changes are constraints on production. Early trials with P. notialis were not encouraging as growth stopped at 6–8 g, howev er new trials may be undertaken.

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