Table 1 Monogenean abundance (A, mean ± SD), prevalence (P) and intensity of infection (II, min–max) for each of fish groups (Rutilus rutilus, Abramis brama, F1 generation with roach mtDNA (F1 R. rutilus × A. brama), F1 generation with common bream mtDNA (F1 A. brama × R. rutilus))

D. crucifer

108.44 ± 115.38

100

6–374

–

–

–

13.77 ± 13.13a*

77

6–37a*

23.13 ± 27.09a*

80

2–94

D. caballeroi

5.44 ± 12.29

44

1–48

–

–

–

2.00 ± 5.79

23

2–21

0.07 ± 0.26

7b

1

D. rutili

5.94 ± 9.93

72

1–33

–

–

–

2.38 ± 3.80

54

1–11

8.53 ± 15.78

67

1–57

D. nanus

8.00 ± 9.78

83

1–33

–

–

–

1.38 ± 1.71a*

46b

1–4

5.60 ± 9.86

60

2–33

D. suecicus

4.28 ± 11.79

39

1–48

–

–

–

0.62 ± 1.04

31

1–3

0.40 ± 1.06

20

1–4

D. fallax

1.22 ± 2.56

33

1–10

–

–

–

0.31 ± 0.48

31

1a

0.27 ± 1.03

7

4

D. similis

3.78 ± 5.34

56

1–16

–

–

–

0.31 ± 0.63

23

1–2

–

–

–

D. sphyrna

3.83 ± 5.27

61

1–18

–

–

–

0.23 ± 0.59a

15b

1–2

0.60 ± 1.45a

20b

1–5

D. rarissimus

2.17 ± 4.89

28

4–20

–

–

–

–

–

–

0.20 ± 0.77

7

3

D. auriculatus

–

–

–

21.08 ± 45.40

100

2–171

–

–

–

0.47 ± 1.36d*

13e*

2–5

D. wunderi

–

–

–

13.69 ± 14.01

92

1–41

0.46 ± 0.97c*

23d*

1–3

0.87 ± 1.88d*

27e*

2–7

D. zandti

–

–

–

174.15 ± 145.69

100

30–471

3.62 ± 3.59c*

69d

1–11c*

1.80 ± 3.32d*

53e*

1–13e*

D. falcatus

–

–

–

15.00 ± 12.35

85

4–37

0.38 ± 1.39c*

8d*

5

1.40 ± 2.41d*

40e

1–7e*

G. vimbi

47.06 ± 101.19

78

1–398

8.23 ± 11.25

62

2–36

4.85 ± 7.22a

46

2–21a

7.67 ± 11.16

67

1–40

G. carassii

7.94 ± 14.72

61

1–52

0.23 ± 0.83

8

3

0.31 ± 0.63a

23b

1–2

–

–

–

G. elegans

–

–

–

1.92 ± 3.20

38

1–10

0.38 ± 0.77

23

1–2

5.13 ± 11.84

47

1–46

P. homoion

12.72 ± 19.74

50

1–67

2.00 ± 4.26

31

1–12

1.00 ± 1.78

31

1–5a

2.67 ± 8.50

20

2–33