期刊
ITALIAN JOURNAL OF ANIMAL SCIENCE
卷 16, 期 4, 页码 685-694出版社
PAGEPRESS PUBL
DOI: 10.1080/1828051X.2017.1305259
关键词
Argyrosomus regius; protein/lipid levels; quality traits; long-term trial
资金
- Greek General Secretariat for Research and Technology, Ministry of Education, Life Long Learning and Religious Affairs
The rearing of meagre (Argyrosomus regius) up to commercial sizes, using diets of different protein/lipid ratios, was examined in two long-term trials. In the first 2 x 2 trial, four diets containing two protein (43% and 47%) and two lipid levels (15% and 20%) were evaluated in fish of 350 g initial weight. Fish were reared for 8 months in triplicate experimental cages, up to final weight of 900g. Growth performance showed that diets containing 43% protein were the most appropriate, as indicated by the better thermal growth coefficient (TGC): 0.70 and 0.71 (vs. 0.61 and 0.53 for 47/15 and 47/20 diets) and better daily growth index DGI: 0.91 and 1.00 (vs. 0.88 and 0.79 for 47/15 and 47/20, respectively). Liver fat did not differ among groups, but liver glycogen in the 43/15 dietary group was found to be significantly higher than the 47/20 (3.89% vs 1.88%). The histological examinations revealed a trend for increased lipid deposition when fish were fed high fat diets. Diets that performed best, namely 43/15 and 43/20, were used in a second trial conducted at a commercial fish farm. Fish weighing 520g were reared for 7 months up to 1100 g final weight. No significant differences were observed in the growth parameters examined. The feed conversion ratio was found to be better in the 43/20 diet compared to the 43/15 (1.58 vs. 1.68, respectively). The dietary fat levels significantly affected fillet fat content. However, such difference in nutritional content was not reflected in human-perceived sensory differences.
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