Dietary Natural Plant Extracts Can Promote Growth and Modulate Oxidative Status of Senegalese Sole Postlarvae under Standard/Challenge Conditions

Abstract

Plant extracts are known for their high content and diversity of polyphenols, which can improve fish oxidative status. A growth trial with Senegalese sole postlarvae (45 days after hatching) fed with one of four experimental diets—control (CTRL), and supplemented with curcumin (CC), green tea (GT), and grape seed (GS) extracts—was performed to assess if supplementation could improve growth performance and oxidative status. At the end of the growth trial, postlarvae were submitted to a thermal stress to assess their robustness. Sole growth was improved by CC and GS diets when compared to those fed the CTRL. CC and CTRL postlarvae presented the lowest oxidative damage (lipid peroxidation and protein carbonylation values). Stress-related biomarkers (heat shock protein 70 and glutathione-S-transferase) decreased in CC fish compared to those fed the CTRL diet, which might be due to a direct antioxidant capacity. In contrast, oxidative damage increased in GT and GS sole reared in standard conditions. However, after a thermal stress, GT and GS diets prevented the increase of protein carbonylation content and the decrease of antioxidant glutathione, depending on exposure time. Overall, dietary supplementation with natural extracts modulated oxidative status and stress response after a short/long-term exposure to temperature.

Use of grape by-products in aquaculture: New frontiers for a circular economy application

“…In contrast to what we have seen so far about the antioxidant properties of the grape seed, oxidative damage increased in soles reared in standard conditions. However, after a thermal stress condition, it was verified that grape seed, depending on the exposure time, reduced both the decline in the antioxidant glutathione and the rise in protein carbonylation concentration [ 80 ].…”

New Strategies to Increase Fish Larval Physiological Responses against Changes in Water Temperature

“…The dietary inclusion of additives with high biological activity may enhance the growth performance and welfare of farmed fish species. The inclusion of grape seed extract in diets for Senegalese sole (Solea senegalensis) promoted the activity of antioxidant enzymes and decreased oxidative damage after thermal acute stress [8]. A protective role against thermal stress has been also described for dietary taurine.…”