Analyses of fin ray types to detect strontium markers in juvenile blunt-snout bream Megalobrama amblycephala

Ecological Processes

Table 1 Changes in Sr/Ca ratios in the fin rays of juvenile blunt-snout bream at 0 d post-immersion in the marked group

Sample code	N	Pre-marking phase			Marking phase			Difference
Sample code	N	Distance from core (µm)	Detected points	Sr/Ca ratio (mean ± SD)	Distance from core (µm)	Detected points	Sr/Ca ratio (mean ± SD)	Difference
20-1-P	1	0–124	63	4.96 ± 1.63	126–184	30	24.60 ± 14.45	*
20-2-P	1	0–80	41	5.23 ± 1.78	82–124	22	24.82 ± 13.45	*
20-3-P	1	0–62	32	3.81 ± 0.95	64–78	8	25.81 ± 9.73	*
20-1-D	1	0–176	89	7.00 ± 2.05	178–218	21	45.27 ± 23.16	*
20-2-D	1	0–146	74	7.20 ± 2.56	148–194	24	42.95 ± 24.08	*
20-3-D	1	0–50	26	5.58 ± 1.87	52–84	17	35.09 ± 18.57	*
20-1-V	1	0–58	30	7.71 ± 2.02	60–84	13	25.26 ± 12.47	*
20-2-V	1	0–58	30	8.68 ± 3.22	60–88	15	34.53 ± 17.96	*
20-3-V	1	0–56	29	4.00 ± 1.35	58–86	15	26.13 ± 8.30	*
20-1-A	1	0–44	23	8.67 ± 3.05	46–80	18	28.29 ± 12.72	*
20-2-A	1	0–50	26	4.00 ± 1.35	52–140	45	24.21 ± 11.73	*
20-3-A	1	0–20	11	2.99 ± 1.17	22–66	23	14.10 ± 4.60	*
20-1-C	1	0–68	35	6.29 ± 1.66	70–90	11	19.12 ± 8.90	*
20-2-C	1	0–32	17	3.85 ± 1.36	34–60	14	19.62 ± 10.00	*
20-3-C	1	0–12	7	6.56 ± 2.60	14–40	14	14.23 ± 3.22	*

Note: In the sample code, “0” represents the number of post-immersion culture days, “1,” “2,” and “3” represent the order of the fish sample, and “P,” “D,” “V,” “A,” and “C” represent the pectoral, dorsal, ventral, anal, and caudal fin rays, respectively. * indicates a significant difference between pre-marking and marking phases for juvenile blunt-snout bream (Mann–Whitney U test, p < 0.05)