Nutritional requirements of the gilthead breamChrysophrys aurata. Quantitative protein requirements

✍ Scribed by J. J. Sabaut; P. Luquet

• Publisher: Springer-Verlag
• Year: 1973
• Tongue: English
• Weight: 471 KB
• Volume: 18
• Category: Article
• ISSN: 0025-3162
• DOI: 10.1007/bf00347920

✦ Synopsis

Six semi-synthetic diets with a casein and corn-starch base, containing 10 to 60% protein were fed for 4 months to young gilthead breams (Chrysophrys aurata, of average initial weight 2.6 g). The object of the study was to determine the optimum amount of protein necessary for growth. The daily intake of the gilthead breams was 5.2 to 2.3 % of their live weight. The less protein the diet contained, the more feed the fish consumed. The conversion factor decreased regularly as protein percentage increased. The most favourable conversion rate was 1.4, noted for the group receiving 60 % protein. The less protein in the diets, the better the protein efficiency for weight gain and body protein retention. Growth of gilthead breams was proportional to protein content of the die~ up to an incorporation rate of 40 %. Beyond this, no significant difference in final average individual weight was observed. These results are discussed in relation to those reported for other species of fishes. They show that the gilthead bream requires about 40 % protein in its diet, as do most fresh-water species.