Weigh Your Catch – Game

The aim of the ‘Weigh Your Catch’ feature is to enable recreational anglers the opportunity to get an estimation of the average weight (in kg) of their catch using only the total length (in cm) of the fish.  These estimates are derived from the length-weight relationship, a scientific formula which is often used by fisheries scientists and is unique to each species.

To use this information all you need to do is:

1. Identify the species of fish you have captured.

2. Measure the FORK LENGTH (FL) of the fish from the tip of the nose to the end of the caudal fork in the tail.

3. Record the FL in centimetres (cm).

4. Use the scale to determine the average weight of the fish at length. Note that as tuna grow their weigh at length can be quite variable depending on fish condition.  Southern bluefin tuna length to weight estimates were calculated from data from commercial 'dressed' landings and were converted with a conversion factor of 1.15.

Fork length (cm) Albacore tuna (kg) S. Bluefin tuna (kg)
45 1.9 1.4
46 2.0 1.5
47 2.2 1.6
48 2.3 1.7
49 2.5 1.8
50 2.6 1.9
51 2.8 2.0
52 3.0 2.2
53 3.2 2.3
54 3.4 2.4
55 3.6 2.6
56 3.8 2.7
57 4.0 2.9
58 4.2 3.1
59 4.4 3.2
60 4.7 3.4
61 4.9 3.6
62 5.1 3.8
63 5.4 4.0
64 5.7 4.2
65 6.0 4.4
66 6.3 4.6
67 6.5 4.8
68 6.9 5.0
69 7.2 5.3
70 7.5 5.5
71 7.8 5.8
72 8.2 6.0
73 8.5 6.3
74 8.9 6.6
75 9.3 6.9
76 9.7 7.2
77 10.1 7.5
78 10.5 7.8
79 10.9 8.1
80 11.3 8.4
81 11.8 8.8
82 12.3 9.1
83 12.7 9.5
84 13.2 9.8
85 13.7 10.2
86 14.2 10.6
87 14.7 11.0
88 15.2 11.4
89 15.8 11.8
90 16.3 12.2
91 16.9 12.7
92 17.5 13.1
93 18.1 13.6
94 18.7 14.0
95 19.3 14.5
96 20.0 15.0
97 20.6 15.5
98 21.3 16.0
99 22.0 16.5
100 22.7 17.1
101 23.4 17.6
102 24.1 18.2
103 24.8 18.7
104 25.6 19.3
105 26.4 19.9
106 27.2 20.5
107 28.0 21.1
108 28.8 21.8
109 29.6 22.4
110 30.5 23.1
111 31.3 23.7
112 32.2 24.4
113 33.1 25.1
114 34.0 25.8
115 35.0 26.5
116 35.9 27.3
117 36.9 28.0
118 37.9 28.8
119 38.9 29.6
120 39.9 30.4
121 40.9 31.2
122 42.0 32.0
123 43.1 32.8
124 44.2 33.7
125 45.3 34.6
126 35.4
127 36.3
128 37.2
129 38.2
130 39.1
131 40.1
132 41.0
133 42.0
134 43.0
135 44.1
136 45.1
137 46.2
138 47.2
139 48.3
140 49.4
141 50.6
142 51.7
143 52.9
144 54.0
145 55.2
146 56.4
147 57.7
148 58.9
149 60.2
150 61.5
151 62.8
152 64.1
153 65.5
154 66.8
155 68.2
156 69.6
157 71.0
158 72.5
159 73.9
160 75.4
161 76.9
162 78.4
163 80.0
164 81.5
165 83.1
166 84.7
167 86.3
168 88.0
169 89.6
170 91.3
171 93.0
172 94.8
173 96.5
174 98.3
175 100.1
176 101.9
177 103.7
178 105.6
179 107.5
180 109.4
181 111.3
182 113.3
183 115.3
184 117.3
185 119.3
186 121.4
187 123.4
188 125.5
189 127.6
190 129.8
191 132.0
192 134.2
193 136.4
194 138.6
195 140.9
196 143.2
197 145.5
198 147.9
199 150.2
200 152.6
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