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Effects of carbohydrate sources on growth, body composition and tissue lipid deposition of blackspot seabream, Pagellus bogaraveo (Brunnich)
Author(s) -
Valente Luísa M. P.,
Olmedo Mercedes,
Borges Pedro,
Soares Silvia,
Gomes Emidio F. S.,
ÁlvarezBlázquez Blanca,
Pazos Gemma,
Linares Fatima
Publication year - 2010
Publication title -
journal of animal physiology and animal nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.651
H-Index - 56
eISSN - 1439-0396
pISSN - 0931-2439
DOI - 10.1111/j.1439-0396.2008.00900.x
Subject(s) - bran , fish meal , feed conversion ratio , food science , biology , carbohydrate , composition (language) , meal , protein efficiency ratio , zoology , weight gain , fish <actinopterygii> , body weight , biochemistry , fishery , ecology , endocrinology , raw material , linguistics , philosophy
Summary 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.