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Effects of Dietary Fiber on Growth and Gastric Emptying Time of the Freshwater Prawn Macrobrachiurn rosenbergii (De Man, 1879)
Authors:Maria, del Carmen Gonzá  lez-Peñ  a Santo Z.,Gomes Gloria S.,Moreira
Affiliation:Departamento de Fisiologia, Instituto de Biociências, Universidade de São Paulo, CP 11461, 05422–970 São Paulo, SP, Brasil;Departamento de Aquicultura, CCA, Universidade Federal de Santa Catarina Rod. SC 404, Km 3, Florianopolis, 88040–900, SC, Brasil;Departamento de Fisiologia, Instituto de Biociências, Universidade de São Paulo, CP 11461, 05422–970 São Paulo, SP, Brasil
Abstract:Feeding experiments were conducted on large and small adult freshwater prawns Macrobrachium rosenbergii (36.96 ± 1.65 and 13.48 ± 1.65 g in weight) to determine the impact of dietary fiber on growth, digestion, and gastric emptying time. Fiber was incorporated as Q- cellulose into four semi-purified diets at calculated levels of 0, 5, 10 and 15% at the expense of starch and fed for an 8-wk period. The experiment was conducted in a closed, filtered, recirculating freshwater system. The results indicate that the specific growth rates, feed conversion ratios, and protein efficiency ratios improved as the levels of dietary fiber increased from 0.4% to 8%. Gastric emptying times increased as the level of inclusion of cellulose in the diets increased. It was concluded that diets containing up to 10% dietary fiber increases growth rates in adult prawn Macrobrachium rosenbergii by increasing nutrient residence time in the gastrointestinal tract, thereby increasing absorption.
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