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Growth performance and intestinal microbial changes of Carassius auratus in response to pomegranate (Punica granatum) peel extract-supplemented diets
Journal of the World Aquaculture Society ( IF 2.8 ) Pub Date : 2020-12-13 , DOI: 10.1111/jwas.12754
Hamidreza Ahmadniaye Motlagh 1 , Zahra Rokhnareh 1 , Omid Safari 1 , Yahya Selahvarzi 2
Affiliation  

This study aimed to investigate the effect of pomegranate (Punica granatum) peel extract (PPE) on growth indices, intestinal bacteria, and total fungi count of Carassius auratus intestine. Ninety C. auratus fries (11.04 ± 0.22 g) were distributed among 15 aquariums (100-L) in a completely randomized design (triplicated), and were fed diets containing 0.1, 1, 2, and 4% PPE for 60 days at a feeding rate of 2% body weight during the experiment. A spectrophotometry assessment indicated that the total phenol and flavonoid content of PPE was 5.44 ± 0.03 and 49.80 ± 1.00 mg/g, respectively. According to the results, the extract significantly reduced the growth indices (final weight, weight gain, specific growth rate (SGR), and feed conversion ratio (FCR)) at 4% compared to the control (p < .05). PPE did not affect the total aerobic bacteria or total lactic acid bacteria count, but the enteric gram-negative bacteria count was significantly reduced in the experimental treatments (p < .05). The total fungi count showed a significant increase in all treated fish (p < .05). According to the results, because of the negative effect of the high dose of PPE on growth, there is a recommendation for it to be used at 2% of the diet to reduce intestinal gram-negative bacteria and increase the total fungi count.

中文翻译:

石榴(Punica granatum)果皮提取物补充日粮对鲫鱼生长性能和肠道微生物变化的影响

本研究旨在研究石榴皮提取物(PPE)对鲫鱼肠道生长指标、肠道细菌和真菌总数的影响。九十C. auratus将薯条(11.04 ± 0.22 g)以完全随机的设计(一式三份)分布在 15 个水族箱(100 升)中,并以 2 倍的饲喂率喂食含有 0.1、1、2 和 4% PPE 的饮食,持续 60 天实验期间的体重百分比。分光光度法评估表明,PPE 的总酚和类黄酮含量分别为 5.44 ± 0.03 和 49.80 ± 1.00 mg/g。根据结果​​,与对照相比,提取物显着降低了 4% 的生长指数(最终重量、增重、比生长率 (SGR) 和饲料转化率 (FCR)) ( p  < .05)。PPE不影响需氧菌总数或乳酸菌总数,但实验处理中肠道革兰氏阴性菌数显着降低(p < .05)。在所有处理过的鱼中,真菌总数显着增加(p  < .05)。根据结果​​,由于高剂量 PPE 对生长的负面影响,建议以 2% 的饮食使用,以减少肠道革兰氏阴性菌并增加真菌总数。
更新日期:2020-12-13
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