Stocking densities for nursery phase culture of the freshwater prawn Macrobrachium rosenbergii in cages
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چکیده
Effect of stocking density on growth, biomass increase and survival of postlarvae of Macrobrachium rosenbergii were evaluated in cages fixed inside an earthen pond. In the primary Ž . nursery phase, newly metamorphosed postlarvae PL were stocked for 20 days at densities of 2, y1 Ž . 4, 6, 8 and 10 PLs l . In the secondary phase 60 days , the densities tested were 100, 200, 300, 400, 600 and 800 PLs m. Prawns were fed with a 35% protein commercial pellet. Survival, Ž . final mean weight and average weight gain were significantly lower P-0.05 in high densities Ž . of the primary phase, whereas biomass increase was significantly higher P-0.05 . In the Ž secondary phase, final mean weight and average weight gain were significantly higher P-0.05 . y2 y2 and P-0.01, respectively for densities of 100 and 200 PLs m than for density of 800 m . Ž . y2 Biomass increase was significantly higher P-0.01 at densities of 400, 600 and 800 PLs m , when compared to densities of 100 and 200 m, whereas survival differences were not significant. High-density nursery culture of M. rosenbergii in cages seems to be feasible, in order to reduce the costs normally found in conventional nursery systems. q 2000 Elsevier Science B.V. All rights reserved.
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تاریخ انتشار 2000