Table 1 Review of available data on 2n, karyotypes and sex systems in the genus Clarias

C. albopunctatus

48

75

4 m + 23sm + 21a

ZW

Nigeria

[19]

C. albopunctatus

48

74

4 m + 22sm + 22a

ZZ

Nigeria

[19]

C. anguillaris

56

91

8 m + 27sm + 21a

ZW

Nigeria

[19]

C. anguillaris

56

90

8 m + 26sm + 22a

ZZ

Nigeria

[19]

C. anguillaris

48

–

27 m + 10sm + 3st + 8 t

–

Nigeria

[53]

C. anguillaris

56

–

33 m + 12sm + 2st + 9 t

–

Nigeria

[53]

C. batrachus

100

111

4 m + 7sm + 77a + 12mc

XY

Thailand

[54]

C. batrachus

56

–

–

China

[55]

C. batrachus

100

110

4 m + 6sm + 78a + 12mc

XX

Thailand

[54]

C. batrachus

50

88

16 m + 8sm + 14st + 12a

India

[56]

C. batrachus

50

96

18 m + 20sm + 8st + 4a

India

[57]

C. batrachus

54

–

[58]

C. batrachus

50

89

16 m + 11sm + 5st + 1at

ZW

India

[59]

C. batrachus

50

88

16 m + 10sm + 6st + 18a

ZZ

India

[59]

C. batrachus

51

89

16 m + 11sm + 5st + 18a + 1B-chromosome

ZW

India

[59]

C. batrachus

51

88

16 m + 10sm + 6st + 18a + 1B-chromosome

ZZ

India

[59]

C. batrachus

50

96

12 m + 18sm + 10st + 10 t

–

India

[60]

C. batrachus

50

90

11 m + 7sm + 2st + 34a

–

Malaysia

[61]

C. batrachus

54

74

12 m + 18sm + 10st + 14 t

–

India

[62]

C. batrachus

104

–

2 m + 4sm + 98st/a

-

Thailand

Present study

C. camerunensis

54

–

–

–

Africa

[63]

C. camerunensis

56

–

22 m + 20sm + 9st + 5 t

-

Nigeria

[53]

C. ebriensis

50

–

–

–

Africa

[63]

C. ebriensis

48

77

6 m + 23sm + 19a

ZW

Nigeria

[19]

C. ebriensis

48

76

6 m + 22sm + 20a

ZZ

Nigeria

[19]

C. fuscus

56

106

18 m + 24sm + 8st + 6a

XX

China

[54]

C. fuscus

56

106

19 m + 23sm + 8st + 6a

XY

China

[54]

C. fuscus

56

106

20 m + 22sm + 8st + 6a

XX

China

[64]

C. fuscus

56

106

20 m + 22sm + 8st + 6a

XY

China

[64]

C. fuscus

56

102

18 m + 14sm + 14st + 10a

XX,XY

China

[65]

C. fuscus

56

88

32 m/sm + 24st/a

–

Japan

[63]

C. gariepinus

56

89

8 m + 25sm + 23a

ZW

Africa, Israel

[37, 66, 67]

C. gariepinus

56

88

8 m + 24sm + 24a

ZZ

Africa, Israel

[37, 58, 67]

C. gariepinus

56

87

14 m + 17sm + 25a

ZW

Egypt

[60]

C. gariepinus

56

88

14 m + 18sm + 24a

ZZ

Egypt

[60]

C. gariepinus

56

102

20 m + 16sm + 10st + 10a

–

India

[60]

C. gariepinus

56

89

8 m + 25sm + 23a

ZW

Nigeria

[19]

C. gariepinus

56

88

8 m + 24sm + 24a

ZZ

Nigeria

[19]

C. gariepinus

56

96

21 m + 14sm + 5st + 16a

–

Malaysia

[61]

C. gariepinus

56

–

25 m + 14sm + 14st + 3 t

–

Nigeria

[53]

C. gariepinus

56

100

28 m + 6sm + 10a + 12 t

–

Turkey

[68]

C. gariepinus

56

100

24 m + 10sm + 10a + 12 t

–

Turkey

[68]

C. gariepinus

54

98

34 m + 10sm + 10 t

–

Nigeria

[69]

C. gariepinus

56

102

6 m + 12sm + 28st + 10a

–

Nigeria

[70]

C. gariepinus

56

98

30 m + 6sm + 6st + 14 t

–

Thailand

[71]

C. gariepinus

56

110

18 m + 20sm + 16st + 2a

–

Thailand

Present study

C. jaensis

54

–

22 m + 12sm + 5st + 15 t

–

Nigeria

[53]

C. macrocephalus

54

104

24 m + 20sm + 6st + 4a

Thailand

[54]

C. macrocephalus

54

98

22 m + 18sm + 4st + 10a

–

Malaysia

[61]

C. macrocephalus

54

104

22 m + 16sm + 12st + 4a

–

Thailand

Present study

C. macromystax

49

–

27 m + 10sm + 11st + 1 t

–

Nigeria

[53]

C. platycephalus

54

–

–

Africa

[63]

C. pachynema

66

–

30 m + 10sm + 16st + 10 t

–

Nigeria

[53]