Akter Shahana, Jahan Nusrat, Rohani Md Fazle, Akter Yeasmin, Shahjahan Md
Laboratory of Fish Ecophysiology, Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh.
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh.
Biol Trace Elem Res. 2021 Dec;199(12):4811-4819. doi: 10.1007/s12011-021-02608-2. Epub 2021 Feb 3.
Chromium (Cr) is a trace element and plays a significant role in fish nutrition and physiology. An experiment was designed to know the effects of Cr addition in the diets to growth and feed utilization in striped catfish (Pangasianodon hypophthalmus). Four diets with Cr (0, 2, 4, and 8 mg kg) were fed to striped catfish in aquaria with triplicate groups for 60 days. Survival, growth parameters (weight gain, WG; %WG; specific growth rate, SGR), and feed utilization (feed intake, FI; feed efficiency, FE; protein efficiency ratio, PER; feed conversion ratio, FCR) were calculated at the end of the feeding trial. Several hemato-biochemical parameters, such as hemoglobin (Hb), red blood cell (RBC), white blood cell (WBC) and glucose level, and frequency of micronucleus (MN) formation in erythrocytes, were analyzed. The growth parameters (WG, %WG, and SGR) and feed utilization (FE and PER) increased significantly in the fish fed with 2 and 4 mg kg Cr supplemented diets. On the other hand, the growth parameters suppressed in the fish fed with 8 mg kg Cr-based diet. The polynomial regression analysis based on WG showed that 2.82 mg kg Cr supplementation in the diet is optimum for the tested fish species. The values of Hb (g/dL), RBC (×10/mm) and blood glucose (mg/dL) significantly decreased in the fish fed with the highest (8 mg kg) Cr-based feed. Conversely, MN frequency was significantly increased in the fish fed with 8 mg kg Cr-based diet. Overall, 2.82 mg Cr kg can be added to the diets of striped catfish for its better growth with maximum utilization of feed.
铬（Cr）是一种微量元素，在鱼类营养和生理学中发挥着重要作用。设计了一项实验，以了解在饲料中添加铬对条纹鲶鱼（Pangasianodon hypophthalmus）生长和饲料利用的影响。将四种含铬（0、2、4和8毫克/千克）的饲料投喂给养殖水族箱中的条纹鲶鱼，每组设三个重复，为期60天。在投喂试验结束时计算存活率、生长参数（增重、WG；增重率、%WG；特定生长率、SGR）和饲料利用率（采食量、FI；饲料效率、FE；蛋白质效率比、PER；饲料转化率、FCR）。分析了几个血液生化参数，如血红蛋白（Hb）、红细胞（RBC）、白细胞（WBC）和血糖水平，以及红细胞中微核（MN）形成的频率。在投喂添加2和4毫克/千克铬饲料的鱼中，生长参数（WG、%WG和SGR）和饲料利用率（FE和PER）显著增加。另一方面，投喂含8毫克/千克铬饲料的鱼的生长参数受到抑制。基于WG的多项式回归分析表明，饲料中添加2.82毫克/千克铬对受试鱼类是最佳的。在投喂最高（8毫克/千克）铬饲料的鱼中，Hb（克/分升）、RBC（×10⁶/毫米³）和血糖（毫克/分升）的值显著降低。相反，在投喂含8毫克/千克铬饲料的鱼中，MN频率显著增加。总体而言，可在条纹鲶鱼饲料中添加2.82毫克/千克铬，以促进其更好地生长并最大程度地利用饲料。
