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Table 1 Sampling and age information of Anguilla japonica and Anguilla marmorata specimens analyzed in this study

From: Effects of metamorphosis timing and the larval growth rate on the latitudinal distribution of sympatric freshwater eels, Anguilla japonica and A. marmorata, in the western North Pacific

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     A. japonica > A. marmorata A. japonica > A. marmorata A. japonica > A. marmorata A. japonica > A. marmorata
  1. aCheng and Tzeng (1996). Values inside parentheses indicate the number of individuals used for aging. Daily age of glass eels at the estuary (T t), daily age at metamorphosis from leptocephalus to glass eel (T m) and the time between the metamorphosis check and estuarine arrival (T t-m).