Growth, tissue metabolites and digestive functionality inSparus auratajuveniles fed different levels of macroalgae,Gracilaria corneaandUlva rigida
| Autor: | Ignacio Ruiz-Jarabo, Félix L. Figueroa, Roberto Abdala, Juan Miguel Mancera, R. M. Rico, Sara Isabel Mendes, A.J. Vizcaíno, José Luis Varela, Francisco Javier Alarcón, Miguel Ángel Moriñigo |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
0106 biological sciences
Meal Intestinal enzymes biology Ecology 010604 marine biology & hydrobiology 04 agricultural and veterinary sciences Metabolism Aquatic Science biology.organism_classification 01 natural sciences Feed conversion ratio Ulva rigida Gracilaria cornea Animal science 040102 fisheries 0401 agriculture forestry and fisheries Composition (visual arts) Gracilaria |
| Zdroj: | Aquaculture Research. 47:3224-3238 |
| ISSN: | 1355-557X |
| Popis: | The aim of this study was to evaluate the inclusion of two macroalgae as dietary ingredients on growth, body composition, intermediate metabolism, intestinal enzymes and gut histology of Sparus aurata juveniles. Six isocaloric and isonitrogenous diets incorporating 5%, 15% or 25% of Gracilaria cornea or Ulva rigida meal were tested against a control diet. Duplicate groups of fifteen fish (14 g) were fed the experimental diets for 70 days. Growth performance showed an inverse linear relationship with the inclusion level of Gracilaria. Feed conversion ratio increased significantly in fish fed 25% Gracilaria. Ulva presented a quadratic relationship with the lowest SGR at 15% of inclusion. Fish fed 25% Ulva exhibited significantly lower lipid content than those fed control diet. Overall, metabolites did not show differences with specimens fed control diet, except for plasmatic glucose and muscle lactate. Intestinal proteolytic activity was reduced with the macroalgae inclusion level, but all fish showed the same enzyme pattern. The histological study revealed no negative effect on liver and intestine structure by the macroalgae inclusion. The present work demonstrated that these ingredients can be used in practical diets for sea bream, but a more comprehensive research is needed to determine the optimum dietary level in a longer feeding trial. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|