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How to weigh your fish with a ruler

Fish Biologists have collected vast quantities of length and weight data from a variety of fish species. This has enabled length and weight relationships to be calculated for some fish species which can be used to estimate weight of a fish by measuring its length. Please note that these figures are estimates only and individual fish weight will vary depending on age, sex, season and recent feeding activity.

Measuring length

In some of the conversion tables, fork length measurements have been used while in others, total length has been used.

Fork length is measured from the snout to the fork of the tail.

Total length (legal length) is measured from the snout to the tip of the tail.

Fork length and total length of fish

Yellowfin bream

Please note: The following table has fork length measurements.

Fork Length (cm)

Weight (kg)

Fork Length (cm)

Weight (kg)

25

0.4

48

2.7

26

0.4

49

2.9

27

0.5

50

3.1

28

0.5

51

3.2

29

0.6

52

3.4

30

0.7

53

3.6

31

0.7

54

3.8

32

0.8

55

4.1

33

0.9

56

4.3

34

1.0

57

4.5

35

1.0

58

4.8

36

1.1

59

5.1

37

1.2

60

5.3

38

1.3

61

5.5

39

1.5

62

5.8

40

1.6

63

6.1

41

1.7

64

6.4

42

1.8

65

6.7

43

1.9

66

7.1

44

2.1

67

7.3

45

2.2

68

7.7

46

2.4

69

8.0

47

2.5

70

8.4

Reference: Steffe, A.S., Murphy, J.J., Chapman, D.J., Tarlinton, B.E. and Grinberg, A. 1996. An assessment of the impact of offshore recreational fishing in NSW waters on the management of commercial fisheries. FRDC Project no. 94/053. Publishers, Fisheries Research Institute, NSW Fisheries. 139pp.

Yellowtail Kingfish

Please note: The following table has fork length measurements.

Fork Length (cm)

Weight (kg)

Fork Length (cm)

Weight (kg)

60

2.8

94

10.6

61

2.9

96

11.3

62

3.0

98

12.0

63

3.2

100

12.8

64

3.4

105

14.8

65

3.5

110

17.0

66

3.7

115

19.4

67

3.8

120

22.0

68

4.0

125

24.9

69

4.2

130

28.0

70

4.4

135

31.4

71

4.6

140

35.0

72

4.8

145

38.9

73

5.0

150

43.0

74

5.2

155

47.5

76

5.6

160

52.0

78

6.1

165

57.3

80

6.5

170

62.6

82

7.0

175

68.3

84

7.6

180

74.3

86

8.1

185

80.7

88

8.7

190

87.4

90

9.3

195

94.5

92

9.9

200

101.9

Reference: Stewart, J., D. J. Ferrell, B. van der Walt, D. Johnson,and M. Lowry. 2002. Assessment of length and age composition of commercial kingfish landings. Final report to the Fisheries Research and Development Corporation, Project No. 97/126. NSW Fisheries, Cronulla.

Snapper

Please note: The following table has fork length measurements.

Fork Length (cm)

Weight (kg)

Fork Length (cm)

Weight (kg)

30

0.6

62

4.5

31

0.7

64

4.9

32

0.7

66

5.4

33

0.8

68

5.8

34

0.9

70

6.3

35

0.9

72

6.9

36

1.0

74

7.4

37

1.1

76

8.0

38

1.2

78

8.6

39

1.3

80

9.2

40

1.3

82

9.8

42

1.5

84

10.5

44

1.7

86

11.2

46

2.0

88

12.0

48

2.2

90

12.7

50

2.5

92

13.5

52

2.8

94

14.4

54

3.1

96

15.2

56

3.4

98

16.1

58

3.8

100

17.1

60

4.1

  

Reference: Moran M. J. and C. Burton. 1990. Relationships among partial and whole lengths and weights for Western Australian pink snapper Chrysophys auratus ( Sparidae). Fisheries Department of Western Australia, Fisheries Research Report No. 89.

Mulloway

Please note: The following table has total length measurements.

Total Length (cm)

Weight (kg)

Total Length (cm)

Weight (kg)

45

1.0

112

14.4

46

1.1

116

16.0

48

1.2

120

17.6

50

1.3

124

19.4

52

1.5

128

21.4

54

1.7

130

22.3

56

1.9

135

24.9

58

2.1

140

27.7

60

2.3

145

30.8

64

2.8

150

34.0

68

3.3

155

37.4

72

3.9

160

41.1

76

4.6

165

45.0

80

5.4

170

49.1

84

6.2

175

53.5

88

7.1

180

58.1

92

8.1

185

63.0

96

9.2

190

68.1

100

10.3

195

73.5

104

11.6

200

79.2

108

12.9

  

Dusky Flathead

Please note: The following table has total length measurements.

Total Length (cm)

Weight (kg)

Total Length (cm)

Weight (kg)

36

0.3

72

2.7

37

0.3

74

2.9

38

0.3

76

3.2

39

0.4

78

3.5

40

0.4

80

3.8

41

0.4

82

4.1

42

0.5

84

4.4

43

0.5

86

4.8

44

0.6

88

5.1

45

0.6

90

5.5

46

0.6

92

5.9

47

0.7

94

6.4

48

0.7

96

6.8

49

0.8

98

7.3

50

0.8

100

7.8

52

0.9

105

9.1

54

1.1

110

10.6

56

1.2

115

12.2

58

1.3

120

14.0

60

1.5

125

15.9

62

1.7

130

18.1

64

1.8

135

20.4

66

2.0

140

23.0

68

2.2

145

25.7

70

2.5

150

28.7

Reference: Steffe, A.S., Murphy, J.J., Chapman, D.J., Tarlinton, B.E. and Grinberg, A. 1996. An assessment of the impact of offshore recreational fishing in NSW waters on the management of commercial fisheries. FRDC Project no. 94/053. Publishers, Fisheries Research Institute, NSW Fisheries. 139pp.

Australian Bass

Please note: The following table has fork length measurements.

Fork Length (cm)

Weight (kg)

Fork Length (cm)

Weight (kg)

25

0.3

43

1.6

26

0.3

44

1.7

27

0.4

45

1.8

28

0.4

46

1.9

29

0.5

47

2.0

30

0.5

48

2.2

31

0.6

49

2.3

32

0.6

50

2.5

33

0.7

51

2.6

34

0.8

52

2.8

35

0.8

53

2.9

36

0.9

54

3.1

37

1.0

55

3.3

38

1.1

56

3.5

39

1.2

57

3.7

40

1.3

58

3.9

41

1.3

59

4.1

42

1.5

60

4.3

Reference: Harris, J. H. 1987. Growth of Australian bass, Macquaria novemaculeata (Perciformes, Percichthyidae), in the Sydney basin. Australian Journal of Marine and Freshwater Research 38:351-361.

Murray cod

Please note: The following table has total length measurements.

Total Length (cm)

Weight (kg)

Total Length (cm)

Weight (kg)

40

1.1

72

7.6

42

1.3

74

8.3

44

1.5

76

9.0

46

1.8

78

9.8

48

2.0

80

10.7

50

2.3

82

11.6

52

2.6

84

12.5

54

3.0

86

13.5

56

3.3

88

14.6

58

3.7

90

15.7

60

4.2

92

16.8

62

4.6

94

18.0

64

5.2

96

19.3

66

5.7

98

20.7

68

6.3

100

22.1

70

6.9

  

Sand whiting

Please note: The following table has fork length measurements.

Fork length(cm) Weight (kg) Fork length(cm) Weight (kg)
25 0.1 38 0.4
26 0.1 39 0.5
27 0.2 40 0.5
28 0.2 41 0.5
29 0.2 42 0.6
30 0.2 43 0.6
31 0.2 44 0.7
32 0.3 45 0.7
33 0.3 46 0.8
34 0.3 47 0.8
35 0.3 48 0.9
36 0.4 49 0.9
37 0.4 50 1.0

Tailor

Please note: The following table has fork length measurements.

Fork length(cm) Weight (kg) Fork length(cm) Weight (kg)
30 0.3 56 2.5
32 0.4 58 2.8
34 0.5 60 3.0
36 0.6 62 3.4
38 0.7 64 3.8
40 0.9 66 4.2
42 1.0 68 4.6
44 1.2 70 5.0
46 1.3 72 5.5
48 1.5 74 6.0
50 1.7 76 6.5
52 1.9 78 7.1
54 2.2 80 7.7

Golden perch

Please note: The following table has fork length measurements.

Fork length(cm) Weight (kg) Fork length(cm) Weight (kg)
30 0.4 41 1.2
31 0.5 42 1.3
32 0.5 43 1.4
33 0.6 44 1.5
34 0.7 45 1.6
35 0.7 46 1.7
36 0.8 47 2.0
37 0.9 48 2.2
38 1.0 49 2.5
39 1.0 50 2.6
40 1.1 51 2.8

Trout

Please note: The following table has fork length measurements.

Fork length(cm) Weight (kg) Fork length(cm) Weight (kg)
27 0.3 51 1.8
29 0.3 53 2.0
31 0.4 55 2.3
33 0.5 57 2.5
35 0.6 59 2.8
37 0.7 61 3.1
39 0.8 63 3.4
41 0.9 65 3.7
43 1.1 67 4.1
45 1.2 69 4.4
47 1.4 71 4.8
49 1.6 73 5.3