Modulation of dietary protein to lipid ratios for gilthead seabream on-growing during summer temperature conditions

Gilthead seabream (Sparus aurata) tend to increase fat deposition during summer farming conditions in the Mediterranean, which may negatively affect productive performance and consumers’ quality perception of final product. Therefore, this study evaluated impacts protein lipid ratios low fishmeal/fish oil diets on growth performance, body composition, feed conversion nutrient utilization on-grown temperature conditions. The experimental contained levels fishmeal, fish oil, crude (39%), differing content: 16% (MF diet) or 12% (LF diet). A trial was performed with (initial weight: 100 ± 7 g) from August October (water temperature: 23.1 2.2 ºC). digestibility also (at 23 Key indicators, whole-body composition activities digestive enzymes were at end experiment (64 days). Low dietary affected lipid, energy, amino acid digestibility, as a result, fed LF diet presented higher nitrogen faecal losses. Still, decrease not related effects enzyme activities. did compromise activity pancreatic, gastric, intestinal nor utilization, but slight impairment observed diet, probably due lower digestibility. However, potential benefit treatment towards reducing accumulation observed. Nevertheless, environmental impact losses on-growing should be considered when estimating sustainability production. This demonstrated that optimisation formulations account for conditions, especially Mediterranean aquaculture, so economic correctly more sustainable