The present study was conducted to investigate the effects of dietary water hyacinth (Eichhornia crassipes) leaves powder (WLP) on growth performance, skin mucus and serum immune response, as well as antioxidant capacity of pikeperch (Sander lucioperca). During 7 weeks culture period, 120 fish (21.2 ± 0.55 g) were fed by experimental diets containing 0% (control), 0.5%, 1% and 1.5% WLP (four treatments in triplicate). At the end of the feeding trial, results revealed a significant increase in final weight (FW), weight gain (WG), daily weight gain (DWG) and specific growth rate (SGR) in fish fed with the highest value 1.5% WLP. Furthermore, increased skin mucus total immunoglobulin (Ig) level and lysozyme (LYZ) activity was noticed in 1 and 1.5% WLP groups, protease in 1.5% WLP group, and alkaline phosphatase (ALP) in 0.5 and 1% WLP groups. Haematological evaluation showed a significant rise in red blood cell (RBC) and haematocrit (HCT) at all WLP inclusion levels, while haemoglobin (Hb) value only increased in group fed by 0.5% dietary WLP. Also, remarkable increase in LYZ, protease and alternative complement (ACH50) activity were observed in WLP‐treated groups. Moreover, higher catalase (CAT) activity was detected in WLP supplemented groups, while higher superoxide dismutase (SOD) activity was detected in 0.5 and 1.5% WLP groups. However, glutathione peroxidase (GPx) activity was higher only in 0.5% WLP group. In conclusion, the present findings showed beneficial effects of water hyacinth leaves powder as a plant‐derived growth promotor and immunostimulant in the pikeperch.

中文翻译：

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使用饮食水葫芦（Eichhornia crassipes）叶粉改善鲈鱼（Sander lucioperca）的生长性能，血清和粘膜免疫力，血液学和抗氧化能力

本研究的目的是研究饮食风信子（Eichhornia crassipes）叶粉（WLP）对生长性能，皮肤黏液和血清免疫反应以及鲈鱼（Sander lucioperca）的抗氧化能力的影响。）。在7周的养殖期间，用含0％（对照），0.5％，1％和1.5％WLP（四种处理一式三份）的实验饲料喂养了120条鱼（21.2±0.55 g）。在饲喂试验结束时，结果显示，饲喂最高值为1.5％WLP的鱼，其最终体重（FW），体重增加（WG），每日体重增加（DWG）和比生长速率（SGR）显着增加。此外，在1％和1.5％WLP组中发现了皮肤粘液总免疫球蛋白（Ig）水平和溶菌酶（LYZ）活性增加，在1.5％WLP组中发现了蛋白酶，在0.5％和1％WLP组中出现了碱性磷酸酶（ALP）。血液学评估显示，在所有WLP包含水平下，红细胞（RBC）和血细胞比容（HCT）均显着升高，而仅以0.5％饮食WLP喂养的组中的血红蛋白（Hb）值升高。此外，LYZ的显着增加，在WLP处理组中观察到了蛋白酶和其他补体（ACH50）活性。此外，在补充WLP的组中检测到较高的过氧化氢酶（CAT）活性，而在0.5％和1.5％的WLP组中检测到了较高的超氧化物歧化酶（SOD）活性。但是，谷胱甘肽过氧化物酶（GPx）活性仅在0.5％WLP组较高。总之，本研究结果显示了风信子叶粉作为the中植物来源的生长促进剂和免疫刺激剂的有益作用。