铬 （Cr） 是一种微量元素，在鱼类营养和生理学中起着重要作用。设计了一项实验，以了解日粮中添加 Cr 对条纹鲶鱼 （Pangasianodon hypophthalmus） 生长和饲料利用的影响。将四种含 Cr 的饮食（0、2、4 和 8 mg kg-1）喂给水族箱中的条纹鲶鱼，一式三份，持续 60 天。在饲喂试验结束时计算存活率、生长参数（体重增加，WG;%WG;比生长速率，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）。分析了血红蛋白 （Hb） 、红细胞 （RBC） 、白细胞 （WBC） 和葡萄糖水平等几个血液生化参数，以及红细胞中微核 （MN） 形成的频率。用 2 和 4 mg kg-1 Cr 添加饲料喂养的鱼的生长参数（WG、%WG 和 SGR）和饲料利用率（FE 和 PER）显着增加。另一方面，用 8 mg kg-1 Cr 基饮食喂养的鱼的生长参数受到抑制。基于 WG 的多项式回归分析表明，在饮食中添加 2.82 mg kg-1 Cr 对于测试的鱼类来说是最佳的。用最高 （8 mg kg-1） Cr 基饲料喂养的鱼的 Hb （g/dL）、RBC （×106/mm3） 和血糖 （mg/dL） 的值显着降低。相反，用 8 mg kg-1 Cr 基饮食喂养的鱼的 MN 频率显着增加。总体而言，可以在条纹鲶鱼的饮食中添加 2.82 mg Cr kg-1，以使其生长更好，并最大限度地利用饲料。
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Chromium Supplementation in Diet Enhances Growth and Feed Utilization of Striped Catfish (Pangasianodon hypophthalmus)
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−1) 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−1 Cr supplemented diets. On the other hand, the growth parameters suppressed in the fish fed with 8 mg kg−1 Cr-based diet. The polynomial regression analysis based on WG showed that 2.82 mg kg−1 Cr supplementation in the diet is optimum for the tested fish species. The values of Hb (g/dL), RBC (×106/mm3) and blood glucose (mg/dL) significantly decreased in the fish fed with the highest (8 mg kg−1) Cr-based feed. Conversely, MN frequency was significantly increased in the fish fed with 8 mg kg−1 Cr-based diet. Overall, 2.82 mg Cr kg−1 can be added to the diets of striped catfish for its better growth with maximum utilization of feed.