Effects of supplementing the diets of Mugil liza Valenciennes, 1836 juveniles with citrus pectin |
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| Authors: | L R V Ramos J M Monserrat L A Romano L A Sampaio P C Abreu M B Tesser |
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| Institution: | 1. Programa de Pós‐Gradua??o em Aquicultura, Universidade Federal do Rio Grande – FURG, Rio Grande, Brasil;2. Instituto de Ciências Biológicas (ICB), Universidade Federal do Rio Grande – FURG, Rio Grande, Brasil;3. Laboratório de Imunologia e Patologia de Organismos Aquáticos, Instituto de Oceanografia, Universidade Federal do Rio Grande – FURG, Rio Grande, Brasil;4. Laboratório de Piscicultura Estuarina e Marinha, Instituto de Oceanografia, Universidade Federal do Rio Grande – FURG, Rio Grande, Brasil;5. Laboratório de Fitoplancton e Microorganismos Marinhos, Instituto de Oceanografia, Universidade Federal do Rio Grande – FURG, Rio Grande, Brasil;6. Laboratório de Nutri??o e Alimenta??o de Organismos Aquáticos, Instituto de Oceanografia, Universidade Federal do Rio Grande – FURG, Rio Grande, Brasil |
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| Abstract: | The aim of this study was to evaluate whether increasing the levels of citrus pectin has anti‐nutritional effects when included in the diets of Mugil liza juveniles, including its effects on hepatic metabolism and modulation of the microbial community. Fish (mean weight 0.38 g ± 0.01) were stocked at a density of 15 fishes per tank and fed for 60 days with either a control diet or one of three diets containing different levels of pectin (4, 8 and 12%), in triplicates. The temperature, dissolved oxygen, pH, salinity and alkalinity during the trial were, respectively, 25.0°C ± 0.1, 6.82 ± 0.02 mg L?1, 8.10 ± 0.06 and 147 mg ± 12.93 CaCO3. The total ammonia‐nitrogen (TAN) in PC4, PC8 and PC12 treatments were, respectively, 0.69 ± 0.38; 0.57 ± 0.35; 0.64 ± 0.39 and 0.45 ± 0.23 mg L?1. The increasing diet viscosity with pectin inclusion did not cause significant differences in growth. Fish fed with pectin demonstrated a reduction in their percentage body dry matter, crude protein and ash. Hepatic glycogen levels were elevated in the group fed with 12% pectin, while there were no effects in cholesterol and triglycerides levels. Citrus pectin did not exert any modulatory effect on the microbial community. Although the pectin‐supplemented fish showed enteritis during the experimental period, this did not impair animal performance. However, the use of this polysaccharide as a binder in mullet (Mugil liza) diets for longer periods should be considered with caution. |
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