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• W1567743560 abstract "portuguesO objetivo deste trabalho foi analisar a influencia de fertilizante orgânico com o proposito de reduzir os efluentes e os custos no cultivo do camarao marinho Litopenaeus vannamei, atraves de dois regimes de fertilizacao: 1) TC (tratamento controle) ? fertilizantes inorgânicos (ureia, monoamonio fosfato e silicato de sodio), e 2) TT (tratamento trigo) ? fertilizante orgânico (farelo de trigo). O experimento foi realizado em seis tanques circulares de fibra de vidro com sedimento estuarino e abastecido com agua de salinidade 25. Apos a fertilizacao inicial os tanques foram estocados com 40 juvenis/m2 de aproximadamente, 2,5 g, com aeracao, por um periodo de 88 dias. O arracoamento foi efetuado com racao comercial com 35 p.100 de proteina bruta, tres vezes ao dia, em bandejas, ajustada diariamente conforme o consumo. A temperatura, oxigenio dissolvido e pH foram mensurados duas vezes ao dia, e a transparencia e salinidade foram aferidas semanalmente. Amostras de agua de cada tanque foram coletadas quinzenalmente para as analises de nutrientes. Os niveis de oxigenio dissolvido foram mais elevados nos tanques com farelo de trigo (6,16 ± 0,98 mg/l) do que com os fertilizantes inorgânicos (5,92 ± 1,19 mg/l). A conversao alimentar apresentou valores variados ao longo do experimento (1,3 e 2,1), justificando o ajuste periodico da racao. A sobrevivencia foi a mesma em ambos os regimes de fertilizacao (96,6 p.100). O ganho de peso no TC foi de 11,89 ± 1,73 g e no TT foi 12,28 ± 1,71 g, sendo o que o farelo de trigo apresentou custo inferior em relacao aos fertilizantes inorgânicos. O farelo de trigo demonstrou bons resultados tanto na manutencao da qualidade da agua sem renovacao como no desenvolvimento dos camaroes EnglishThe aim of this study was to analyze the influence of organic fertilizer with the purpose of costs and effluents reduction in the marine shrimp Litopenaeus vannamei culture through two fertilization regimes: 1) CT (control treatment) - inorganic fertilizers (urea, monoammonium phosphate and sodium silicate), and 2) WT (wheat treatment) - organic fertilizer (wheat bran). Experimental tanks consisted of fiberglass with estuarine sediment in the bottom and 25 ppt water. After initial fertilization the tanks were stocked with 40 2.5 g juveniles/m2 and maintained with aeration during 88 culture days. Shrimps were fed with a 35 percent crude protein commercial pelleted ration through feeding trays, three times per day and adjusted according to daily consumption. Water temperature, dissolved oxygen and pH were measured daily; the transparency and salinity were checked weekly and water samples of each tank were collected biweekly for nutrients analyses. Dissolved oxygen levels were higher in the wheat bran (6.16 ± 0.98 mg/l) than with the inorganic fertilizers (5.92 ± 1.19 mg/l). Different feed conversion ratios were observed along the experiment (1.3 and 2.1), justifying periodic adjustments of the amount of artificial diets. The survival was the same for both fertilization regimes (96.6 percent). The final weight in CT was 11.89 ± 1.73 g and in WT was 12.28 ± 1.71 g, with lower cost of the wheat bran in relation to the inorganic fertilizers. The wheat bran showed good results both in the maintenance of water quality without exchange and the performance of the shrimps" @default.
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• W1567743560 date "2007-01-01" @default.
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• W1567743560 title "Grow out of the Litopenaeus vannamei in Microcosms fertilized with Wheat Bran without Water Exchange" @default.
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