Yepist - Alimentos para Organismos Aquáticos, Recife, PE, Brasil.
Universidade Federal da Grande Dourados - UFGD, Dourados, MS, Brasil.
Braz J Biol. 2024 May 31;84:e280128. doi: 10.1590/1519-6984.280128. eCollection 2024.
This study evaluated the growth performance and parasite load of angelfish juveniles Pterophyllum scalare kept at different stocking densities using two rearing systems. The experiment was conducted in a factorial design (4x2) with four stocking densities (0.1, 0.4, 0.7, and 1.0 g/L), two type of aquarium tanks (glass and ceramic aquariums), and four replicates. The experiment lasted 60 days using 148 juvenile fish (3.05 ± 0.09 g) randomly placed in 32 aquariums (50 L) equipped with filters and aeration. All fish received two meals a day ad libitum (8:00 and 16:00). Water quality parameters such as temperature, dissolved oxygen, pH, and total ammonia were measured. At the end of the experiment, all fish were measured and weighed to determine growth performance and then subjected to parasitological analysis. The data were analyzed with a two-way ANOVA with post-hoc Tukey test (p<0.05). No effects on growth performance at different stocking densities were observed. However, there was an increase in Capillaria pterophylli infestation in the high stocking density within ceramic aquariums. Thus, this study recommends the use of 1.0 g/L for the intensive aquaculture system of freshwater angelfish, and applying cleaning management to avoid parasite infestation, particularly in ceramic aquariums.
本研究评估了使用两种养殖系统在不同放养密度下饲养的神仙鱼幼鱼的生长性能和寄生虫负荷。实验采用析因设计（4x2），设置四个放养密度（0.1、0.4、0.7 和 1.0 g/L）、两种水族箱类型（玻璃和陶瓷水族箱）和四个重复。实验使用 148 条幼鱼（3.05 ± 0.09 g）进行，随机放置在 32 个配备过滤器和曝气装置的 50 L 水族箱中，持续 60 天。所有鱼每天都自由采食两餐（8:00 和 16:00）。测量了水质参数，如温度、溶解氧、pH 和总氨。实验结束时，所有鱼都进行了测量和称重，以确定生长性能，然后进行寄生虫分析。数据采用双因素方差分析和事后 Tukey 检验（p<0.05）进行分析。不同放养密度对生长性能没有影响。然而，在陶瓷水族箱中，高放养密度下的 Capillaria pterophylli 感染有所增加。因此，本研究建议在淡水神仙鱼的集约化养殖系统中使用 1.0 g/L，并进行清洁管理以避免寄生虫感染，特别是在陶瓷水族箱中。
