Dietary lipid level affects growth performance and nutrient utilisation of Senegalese sole ( Solea senegalensis) juveniles. | - CCMAR -

Journal Article

TitleDietary lipid level affects growth performance and nutrient utilisation of Senegalese sole ( Solea senegalensis) juveniles.
Publication TypeJournal Article
AuthorsBorges, P, Oliveira, B, Casal, S, Dias, J, Conceição, L, Valente, LMP
Year of Publication2009
JournalBr J Nutr
Volume102
Issue7
Date Published2009 Oct
Pagination1007-14
ISSN1475-2662
KeywordsAnimal Nutritional Physiological Phenomena, Animals, Aquaculture, Body Composition, Diet, Dietary Fats, Eating, Fatty Acids, Flatfishes, Growth, Lipid Metabolism, Muscle, Skeletal, Weight Gain
Abstract

Over the last few years, several aspects of Senegalese sole (Solea senegalensis) culture have been developed and optimised but the dietary lipid level for optimal growth has never been determined. Hence, five isonitrogenous diets (56 % dietary protein) with increasing dietary lipid levels (4, 8, 12, 16 and 20 % DM) were fed to satiation to triplicate groups of twenty fish (mean initial weight 10 g). Fifteen tanks were randomly assigned one of the five diets. Feed was distributed using automatic feeders, and fish were fed over a 16-week period. At the end of the experiment the fish fed on diets containing the two lowest dietary lipid levels (4 and 8 %) showed a 3-fold body-weight increase with a significantly higher daily growth index than fish fed higher lipid levels (1.2 v. 0.8). Moreover, these fish displayed a significantly lower dry feed intake (12 g/kg per d) and feed conversion ratio (1.0) compared with fish fed higher lipids levels (16-19 g/kg per d; feed conversion ratio 2.0). Low dietary lipid levels ( < 12 %) significantly improved nutrient retention and gain and hence growth, without major effects on whole-body composition. Despite the slight alteration in n-3 PUFA muscle content in the fish fed low-fat-diets, this fish fed low dietary lipid still remains a rich n-3 PUFA product and generally maintained its nutritional value. These results evidenced a low lipid tolerance of Senegalese sole juveniles and suggest a maximal dietary inclusion level of 8 % lipids for both optimal growth and nutrient utilisation without compromising flesh quality.

DOI10.1017/S0007114509345262
Sapientia

http://www.ncbi.nlm.nih.gov/pubmed/19393115?dopt=Abstract

Alternate JournalBr. J. Nutr.
PubMed ID19393115
CCMAR Authors