期刊
AQUACULTURE RESEARCH
卷 52, 期 1, 页码 356-363出版社
WILEY
DOI: 10.1111/are.14898
关键词
carnivorous fish; feed additive; feed training efficiency; intestine histomorphometry; Lophiosilurus alexandri; monosodium glutamate
类别
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico [304975/2017-6, 308547/2018-7]
- Coordination for the Improvement of Higher Education Personnel (CAPES)
- Minas Gerais State Foundation for Research Aid (FAPEMIG)
The study aimed to evaluate monosodium glutamate (MSG) dietary supplementation during pacama (Lophiosilurus alexandri) feed training through growth performance and intestinal histomorphometry. Although MSG did not affect growth performance and feed training efficiency, fish trained with diets supplemented with high levels of MSG showed an increase in the number of goblet cells in the anterior portion of the intestine.
Feed training of carnivorous fish is a delicate and stressful process. Thus, feed additives that reduce stress and encourage fish consumption could improve training efficiency. Therefore, the aim of this study was to evaluate monosodium glutamate (MSG) dietary supplementation during pacama (Lophiosilurus alexandri) feed training through growth performance and intestinal histomorphometry. Fish were trained by the method of gradual diet transition, using five diets with increasing proportions of commercial diet and decreasing proportions of gelatin. A quadruplicate experimental design was performed with seven treatments, consisted in diets supplemented with different levels of MSG (0.0; 2.0; 8.0; 16.0; 29.0; 34.0 and 42.0 g/kg). Pacama (0.17 +/- 0.01 g) were distributed in 28 tanks (30 fish per tank) and trained for 41 days with the experimental diets. There were no effects (p > .05) of MSG on growth performance and feed training indices. However, fish trained with diets supplemented with 42.0 g/kg of MSG presented higher number of goblet cells in the anterior portion of intestine (p < .05). These results demonstrate that MSG did not act on growth performance and feed training efficiency of pacama, and high levels of MSG can cause dietary stress on fish intestinal mucosa.
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