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. 2022 Sep;200(9):4150-4159. doi: 10.1007/s12011-021-03001-9. Epub 2021 Nov 5.
Zinc (Zn) and vitamin E (VE) are essential micro-nutrients that contribute a pivotal role in the physiology and nutrition of fish. An experiment was designed to know the effects of Zn and VE addition in the diet on growth and feed utilization in Nile tilapia (Oreochromis niloticus). Four diets containing Zn (80 mg/kg), VE (50 mg/kg), Zn (80 mg/kg) + VE (50 mg/kg), and without Zn and VE (control) were fed to Nile tilapia in aquaria with triplicate groups for 6 weeks. Survival, growth parameters (weight gain, WG; %WG; specific growth rate, SGR), and feed utilization (protein efficiency ratio, PER; feed conversion ratio, FCR) were calculated at the end of the feeding trial. Several hemato-biochemical parameters (hemoglobin, Hb; red blood cell, RBC; white blood cell, WBC, and glucose) and morphology of muscle were analyzed. The growth parameters (WG, %WG, and SGR) and feed utilization (FCR and PER) improved significantly in the fish fed with Zn, VE, and Zn + VE supplemented diets. There was no significant change in the values of Hb, RBC, WBC, and glucose level among different groups. Significantly improved diameter of muscle fiber, reduced distance between muscle fiber, and increased number of the nucleus and hyperplastic muscle fiber were observed in the fish fed with Zn, VE, and Zn + VE supplemented diets. These results suggested that Zn and VE can be effectively incorporated into the diets of Nile tilapia for better growth with maximum feed utilization.
锌（Zn）和维生素 E（VE）是鱼类生理和营养所必需的微量营养素，具有重要作用。本实验旨在研究饲料中添加 Zn 和 VE 对尼罗罗非鱼（Oreochromis niloticus）生长和饲料利用的影响。将含有 Zn（80mg/kg）、VE（50mg/kg）、Zn（80mg/kg）+VE（50mg/kg）和不含 Zn 和 VE（对照）的四种饲料分别投喂到水族箱中的尼罗罗非鱼，每组设 3 个重复，共投喂 6 周。在喂养试验结束时，计算存活率、生长参数（体重增加、WG；%WG；特定生长率、SGR）和饲料利用（蛋白质效率比、PER；饲料转化率、FCR）。分析了几种血液生化参数（血红蛋白、Hb；红细胞、RBC；白细胞、WBC 和葡萄糖）和肌肉形态。添加 Zn、VE 和 Zn+VE 的饲料显著提高了鱼的生长参数（WG、%WG 和 SGR）和饲料利用（FCR 和 PER）。不同组间 Hb、RBC、WBC 和葡萄糖水平没有显著变化。在添加 Zn、VE 和 Zn+VE 的饲料中，鱼的肌纤维直径显著增大，肌纤维间距减小，核数和增生肌纤维增多。这些结果表明，Zn 和 VE 可有效添加到尼罗罗非鱼饲料中，以提高生长性能和最大饲料利用率。
