Table 1 Sampling and age information of Anguilla japonica and Anguilla marmorata specimens analyzed in this study
Species | Sampling site | Sampling date | Number | Total length (mm) | Age (days) | ||
|---|---|---|---|---|---|---|---|
T m | T t | T t−m | |||||
A. japonica a | Tungkang River, Taiwan | 30 December 1992 | 30 (16) | 57.0 ± 2.0 | 138.7 ± 14.3 | 177.7 ± 17.8 | 39.0 ± 11.2 |
24 March 93 | 30 (14) | 56.1 ± 2.4 | 134.0 ± 14.1 | 174.4 ± 17.9 | 40.4 ± 11.0 | ||
Shuangshi River, Taiwan | 20 December 92 | 30 (12) | 56.8 ± 2.3 | 135.7 ± 16.6 | 175.0 ± 20.9 | 39.5 ± 9.2 | |
17 February 93 | 30 (13) | 55.9 ± 2.2 | 128.9 ± 14.6 | 174.4 ± 17.7 | 45.5 ± 13.4 | ||
Mingchiang River, China | 1 March 93 | 30 (20) | 55.1 ± 1.9 | 139.6 ± 10.1 | 172.1 ± 14.1 | 32.5 ± 7.7 | |
Chyantarng River, China | 17 February 93 | 30 (23) | 55.6 ± 1.9 | 148.1 ± 14.7 | 194.9 ± 18.6 | 46.8 ± 8.9 | |
Yalu River, China | 3 May 93 | 30 (23) | 58.3 ± 1.8 | 157.4 ± 16.1 | 199.3 ± 15.6 | 41.9 ± 3.9 | |
Ichinomiya River, Japan | 10 January 94 | 30 (10) | 57.4 ± 2.3 | 143.3 ± 7.9 | 186.6 ± 7.0 | 43.3 ± 5.2 | |
 Overall (μ1) |  |  | 240 (131) | 56.5 ± 2.1 | 140.7 ± 13.6 | 181.8 ± 16.2 | 41.1 ± 8.8 |
A. marmorata | Cagayan River, the Philippines | 19 May 08 | 45 (13) | 49.5 ± 1.5 | 110.4 ± 12.8 | 144.8 ± 14.2 | 34.3 ± 7.9 |
Hsiukuluan River, Taiwan | 20 May 08 | 86 (13) | 51.6 ± 1.6 | 112.4 ± 12.3 | 134.0 ± 15.4 | 22.6 ± 6.6 | |
Kurio River, Japan | 6 June 96 | 37 (15) | 46.7 ± 1.7 | 117.7 ± 16.8 | 145.0 ± 17.8 | 27.3 ± 8.9 | |
 Overall (μ2) |  |  | 168 (41) | 49.3 ± 1.6 | 113.5 ± 13.0 | 141.6 ± 15.8 | 28.1 ± 7.8 |
 Difference (μ1−μ2) |  |  |  | 7.2 | 27.2 | 40.2 | 13.0 |
Significance | Â | Â | Â | A. japonica > A. marmorata | A. japonica > A. marmorata | A. japonica > A. marmorata | A. japonica > A. marmorata |