The present work aimed to investigate the impacts of tank color (transparent, light blue, and red), feed pellet types (floating and sinking), and their interaction on the performance and welfare of red hybrid tilapia juveniles with an initial average weight of 19.59 g for a 50 day trial period following a 3 × 2 factorial design. Fish were cultured randomly at a stoking rate of 10 juveniles/100-L tank. Fish were fed 6 days per week at a rate of 4% biomass twice daily. Three replicates were performed for each measurement. A two-way analysis of variance showed that using tanks of different colors (transparent, light blue, and red) has no impact on the growth, feed efficacy, survival rate, and blood composition (except for red blood cells, hematocrit, and triglycerides) of tilapia. Also, pellet types (floating and sinking) showed no significant alterations for the above variables except for glucose and hematocrit levels. Interestingly, the interaction between tank color and pellet type exhibited significant impacts on growth parameters, feed utilization, blood variables, and intestinal enzymes of red hybrid tilapia. Moreover, fish reared in transparent or light blue tanks and fed with floating diets performed the best for all evaluated parameters. Additionally, sinking pellets had better effects when combined with red (dark)-colored tanks.

中文翻译：

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罐体颜色与颗粒饲料类型相互作用对微咸水饲养红杂交罗非鱼（Oreochromis mossambicus × Oreochromis niloticus）幼鱼生物学和生理指标的影响

目前的工作旨在研究水箱颜色（透明、浅蓝色和红色）、饲料颗粒类型（浮式和沉式）的影响，以及它们对初始平均体重为 19.59 的红色杂交罗非鱼幼鱼的生产性能和福利的相互作用。 g 3 × 2 析因设计后的 50 天试用期。鱼以10条幼鱼/100升鱼缸的饲养率随机养殖。每周以 4% 生物量的比例喂鱼 6 天，每天两次。每次测量进行三次重复。双向方差分析表明，使用不同颜色（透明、浅蓝色和红色）的罐体对生长、饲料效率、成活率和血液成分（红细胞、血细胞比容和甘油三酯除外）没有影响）的罗非鱼。此外，除葡萄糖和血细胞比容水平外，颗粒类型（漂浮和下沉）显示上述变量没有显着变化。有趣的是，水箱颜色和颗粒类型之间的相互作用对红色杂交罗非鱼的生长参数、饲料利用率、血液变量和肠道酶产生显着影响。此外，在透明或浅蓝色水箱中饲养并用漂浮饲料喂养的鱼在所有评估参数中表现最好。此外，与红色（深色）坦克结合使用时，下沉颗粒效果更好。