Growth Performance, Feed Utilisation, Digestive and Metabolic Enzyme Activity, and Liver Morphohistology in Hybrid Tilapia (Oreochromis mossambicus × Oreochromis niloticus) Juveniles Fed with the Inclusion of Chitosan in Their Diet
Yuniel Méndez-Martínez, Alan Rodrigo Vera-Veliz, Edilmar Cortés-Jacinto, Yanis Cruz-Quintana, Aroldo Botello-Leon, Pedro Daniel Mendoza-Carranza, Natalia S. Calvo
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引用次数: 0
Abstract
This study aimed to evaluate the growth performance, feed utilisation, digestive and metabolic enzyme activity, and liver histology in juveniles of hybrid red tilapia (Oreochromis mossambicus × Oreochromis niloticus) fed with the inclusion of chitosan in their diet. Six dietary chitosan levels (0 “control’’, 10, 20, 30, 40, and 50 g kg−1) were used to feed juvenile fish (initial weight 7.50 ± 0.20 g) that were cultured for eight weeks in 18 tanks at a density of 15 fish/tank. The growth performance presented significant differences (p ˂ 0.05) for weight gain, specific growth rate, feed conversion ratio, hepatosomatic index, and survival rate. The digestive and metabolic enzyme activities were significantly (p < 0.05) influenced by the levels of chitosan in the administered diet. Histologically, no damage was found in the liver; however, morphometrically, a significant difference (p < 0.05) was found in the hepatocyte area and sinusoid area. Vacuolisation of hepatocytes was found in treatments with 40 and 50 g kg−1 of chitosan in the diet. Treatments with doses of chitosan showed a better response (p < 0.05) compared to the control treatment in most of the different groups of variables analysed. The result of the principal component analysis suggests that a diet containing 40 g kg−1 of chitosan is optimal for tilapia growth performance.
本试验旨在研究在饲料中添加壳聚糖对杂交红罗非鱼幼鱼(Oreochromis mossambicus × Oreochromis niloticus)生长性能、饲料利用率、消化代谢酶活性和肝脏组织学的影响。试验采用6种不同水平的壳聚糖(0“对照”、10、20、30、40和50 g kg - 1)饲喂初始体重为7.50±0.20 g的幼鱼,这些幼鱼在18个水族箱中以15条/水族箱的密度养殖8周。生长性能在增重、特定生长率、饲料系数、肝体指数和成活率方面存在显著差异(p小于0.05)。消化代谢酶活性显著提高(p <0.05),受饲粮中壳聚糖含量的影响。组织学上,肝脏未见损伤;然而,形态计量学上,显著差异(p <肝细胞区和窦区可见0.05)。在日粮中添加40和50 g kg - 1壳聚糖时,肝细胞出现空泡化。壳聚糖治疗效果更好(p <0.05),与对照组相比,在大多数不同组的变量分析。主成分分析结果表明,壳聚糖的添加量为40 g kg−1,有利于罗非鱼的生长性能。