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Table 2 Total length and egg characteristics of ruffe collected from one brackish water (Pärnu) and two freshwater (Saadjärv and Peipsi) sites

From: Variations in egg characteristics of ruffe Gymnocephalus cernua inhabiting brackish and freshwater environments

Site TL (mm) Fish condition Egg diameter (mm) Egg wet weight (mg) Egg dry weight (mg) Egg dry matter (%) Egg mass energy (kJ/g) Egg energy (J)
Pärnu Bay 189 ± 21
124–233
N = 42
0.90 ± 0.08
0.72–1.11
N = 42
1.125 ± 0.055
1.016–1.233
N = 42
0.676 ± 0.095
0.508–0.923
N = 42
0.226 ± 0.035
0.171–0.321
N = 42
34.4 ± 1.3
31.7–36.5
N = 42
26.34 ± 0.63
25.51–28.10
N = 16
6.15 ± 1.02
4.47–8.52
N = 16
Lake Saadjärv I 97 ± 10
80–115
N = 21
0.98 ± 0.05
0.89–1.08
N = 21
0.913 ± 0.036
0.842–0.990
N = 21
0.357 ± 0.051
0.284–0.446
N = 21
0.118 ± 0.015
0.094–0.146
N = 21
33.2 ± 1.6
30.1–36.2
N = 21
25.94 ± 0.36
25.25–26.34
N = 8
3.29 ± 0.41
2.53–3.77
N = 8
Lake Saadjärv II 110 ± 9
92–125
N = 22
1.01 ± 0.07
0.90–1.35
N = 22
0.831 ± 0.024
0.779–0.876
N = 22
0.286 ± 0.040
0.225–0.390
N = 22
0.083 ± 0.012
0.059–0.113
N = 22
29.0 ± 2.6
21.7–32.5
N = 22
24.99 ± 0.67
23.96–26.00
N = 7
2.17 ± 0.28
1.87–2.74
N = 7
Lake Peipsi 150 ± 16
109–168
N = 31
0.79 ± 0.07
0.67–0.97
N = 31
0.804 ± 0.038
0.736–0.888
N = 31
0.284 ± 0.049
0.157–0.414
N = 31
0.074 ± 0.011
0.042–0.100
N = 31
26.2 ± 2.2
21.5–29.9
N = 31
25.24 ± 0.84
23.93–26.45
N = 8
1.91 ± 0.36
1.54–2.57
N = 8
  1. Lake Saadjärv I and II denote the first and the second batch of eggs. Values are given as mean ± SD and range