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Table 3 Mean increment widths of radii of R m , R t , and R t−m in otoliths of Anguilla japonica and A. marmorata glass eels

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 Increment width in μm (n)
R m R t R t−m
A. japonica a Tungkang River, Taiwan 30 December 92 0.8 ± 0.07 (5) 0.9 ± 0.09 (5) 1.2 ± 0.31 (5)
24 March 93 0.8 ± 0.07 (7) 0.8 ± 0.03 (5) 1.4 ± 0.19 (5)
Shuangshi River, Taiwan 20 December 92 0.8 ± 0.07 (7) 0.9 ± 0.03 (6) 1.5 ± 0.48 (6)
17 February 93 0.9 ± 0.09 (3) 1.0 ± 0.04 (2) 1.4 ± 0.03 (2)
Mingchiang River, China 1 March 93 0.7 ± 0.02 (5) 0.9 ± 0.06 (5) 1.4 ± 0.38 (5)
Chyantarng River, China 17 February 93 0.7 ± 0.08 (7) 0.8 ± 0.03 (4) 1.3 ± 0.17 (4)
Yalu River, China 3 May 93 0.8 ± 0.09 (8) 0.9 ± 0.05 (8) 1.3 ± 0.45 (8)
Ichinomiya River, Japan 10 January 94 0.7 ± 0.06 (5) 0.8 ± 0.05 (5) 1.2 ± 0.26 (5)
 Overall (μ1)    0.78 ± 0.07 (47) 0.88 ± 0.05 (40) 1.34 ± 0.28 (40)
A. marmorata Cagayan River, the Philippines 19 May 08 1.0 ± 0.18 (13) 1.1 ± 0.14 (13) 1.84 ± 0.46 (13)
Hsiukuluan River, Taiwan 20 May 08 0.9 ± 0.10 (13) 1.2 ± 0.18 (13) 2.29 ± 0.72 (13)
Kurio River, Japan 6 June 96 0.9 ± 0.14 (15) 1.1 ± 0.17 (15) 2.18 ± 0.61 (15)
 Overall (μ2)    0.93 ± 0.14 (41) 1.13 ± 0.16 (41) 2.10 ± 0.60 (41)
 Difference (μ2−μ1)    0.15 0.25 0.76
Significance    A. marmorata > A. japonica A. marmorata > A. japonica A. marmorata > A. japonica
  1. aCheng and Tzeng (1996). Mean increment widths (±SD) of radii of R m, R t, and R t−m in otoliths of A. japonica and A. marmorata glass eels. n, number of individuals used for increment width measurements.