Table 3.

The top five most abundant phyla in relation to the dietary treatment.

Diet	dpff	Proteobacteria		Firmicutes		Bacteroidetes		Fusobacteria		Actinobacteria
		Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD
Mean abundance of phyla in [%]
X	61	74.5a	9.9	15.1a	11.8	2.2	0.4	4.9a	3.0	0.8	0.3
XX	109	58.9	24.3	23.6	24.2	9.0	16.2	2.7	2.5	4.3	10.1
XY	109	47.0	11.7	37.2	16.3	11.4	22.7	1.9	1.6	1.5	1.2
XZ	109	41.3	23.7	37.4	31.1	16.9	18.5	0.3	0.5	1.6	1.2
Y	61	43.1b	2.4	48.4b	1.0	2.3	1.9	4.3a,b,*	1.1	1.1	0.3
YX	109	67.4A	22.6	20.1A	14.2	6.4	9.1	4.1A	2.8	0.9	0.8
YY	109	45.6A,B	17.1	45.2B	20.2	4.5	9.0	2.0A,*	1.7	1.8	2.8
YZ	109	29.1B	20.4	53.0B	31.0	13.5	19.6	0.4B	0.4	1.1	1.0
Z	61	46.9a,b	18.7	8.2a,*	7.2	13.2	8.8	0.1b,*	0.2	16.8	23.6
ZX	109	73.9A	9.0	18.8A	7.4	1.6	1.5	4.6A	2.7	0.9	1.8
ZY	109	45.5B	10.6	36.3A,B	20.3	13.0	16.1	2.0B	1.2	1.4	1.0
ZZ	109	29.2C	10.7	50.6B,*	26.2	16.0	18.8	1.2B,*	1.5	1.0	1.0

The average relative abundance in percent of the top five most abundant phyla are presented (fish were sampled from one tank per treatment at the end of the first-feeding period (61 dpff); and from three tanks per treatment at the end of the second feeding period (109 dpff); please see Table 2 for exact sample size and Supplementary Table S1 for detailed information).

^a,b,cStatistically significant differences (P < 0.05) between first-feeding diets are indicated by lower case superscript letters.

^A,B,CStatistically significant differences (P < 0.05) between second feeding diets are indicated by upper case superscript letters, separate for each corresponding first-feeding diet.

*Statistically significant differences (P < 0.05) between sampling points of continuously fed diets are indicated by superscript asterisks.