title: Effects of carbohydrate sources on growth, body composition and tissue lipid deposition of blackspot seabream, Pagellus bogaraveo (Brunnich).
abstract: Rearing blackspot seabream has been associated with low growth rates and excessive lipid accumulation, resulting in a reduction of the edible yield. The effect of extruded diets containing different carbohydrate sources (wheat vs. wheat bran) was evaluated on 100 g blackspot seabream growth performance, feed utilization and fat deposition, taking into consideration the optimal dietary protein and lipid level described for smaller-sized fish. A fish meal-based diet was also tested as a control to assure maximal growth rates were achieved. The experiment was held in sea cages at environmental conditions. Duplicate groups of fish were distributed among six cages with a stocking density of 1.3 kg/m(3) and hand-fed each diet for 7 months. At the end of the experiment, fish in all groups doubled their body weight attaining 190-230 g. Specific growth rate (0.3-04), feed conversion ratio (1.3-1.6) and protein gain (0.5-0.6 g/kg/day) were similar among treatments. The Hepatosomatic Index, the Viscerosomatic Index and final whole body composition did not vary significantly among dietary treatments; nevertheless, the inclusion of wheat bran induced a significant increase of liver lipid content and the highest mesenteric fat index. All diets were effective in reducing whole body and mesenteric fat compared with initial values.
authors.affiliation: CIMAR/CIIMAR, Universidade do Porto, Porto, Portugal. lvalente@icbas.up.pt
authors.forename: Luísa M P
authors.initials: LM
authors.lastname: Valente
authors.forename: Mercedes
authors.initials: M
authors.lastname: Olmedo
authors.forename: Pedro
authors.initials: P
authors.lastname: Borges
authors.forename: Silvia
authors.initials: S
authors.lastname: Soares
authors.forename: Emidio F S
authors.initials: EF
authors.lastname: Gomes
authors.forename: Blanca
authors.initials: B
authors.lastname: Alvarez-Blázquez
authors.forename: Gemma
authors.initials: G
authors.lastname: Pazos
authors.forename: Fatima
authors.initials: F
authors.lastname: Linares
mesh_terms: D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001823:Body Composition / Q000187:drug effects*; D004032:Diet / Q000662:veterinary; D004040:Dietary Carbohydrates / Q000494:pharmacology*; D004043:Dietary Fiber; D004334:Drug Administration Schedule; D050356:Lipid Metabolism; D008055:Lipids / Q000032:analysis*; D021541:Sea Bream / Q000254:growth & development* / Q000502:physiology*; D014908:Triticum
chemical_list: D004040:Dietary Carbohydrates; D004043:Dietary Fiber; D008055:Lipids