Fig. 1

Alpha diversity indices including observed ASVs, Shannon diversity, and Simpson indexes of the four treatments from rainbow trout gut content after 59 days of feeding. The left panel shows trout line A (0-F, 0-V, 1-F, 1-V), and the right panel shows trout line B (0-F, 0-V, 1-F, 1-V). Boxes are colored according to factor stress, where the unstressed group (0) is yellow and the stressed group (1) is blue. FM-based diet (F) and plant-based diet (V). n = 3