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Table 1.  Fork length (FL) - total length (TL) relationships for 13 shark species from the western North Atlantic, based on FL = (a)TL + b. (Fork length and total length means and ranges were taken from data presented in this study.)

Species
N
Mean
total
length
(cm)
Total
length
range
(cm)
Mean
fork
length
(cm)
Fork
length
range
(cm)
FL = (a)TL + b
a
b
r2
Bigeye thresher
(Alopias superciliosus)
56
312
155-371
192
100-228
0.5598
17.6660
0.8944
Thresher shark
(A. vulpinus)
13
373
291-450
211
168-262
0.5474
7.0262
0.8865
White shark
(Carcharodon carcharias)
112
204
122-517
187
112-493
0.9442
-5.7441
0.9975
Shortfin mako
(Isurus oxyrinchus)
199
171
70-368
157
65-338
0.9286
-1.7101
0.9972
Porbeagle
(Lamna nasus)
13
201
119-247
182
106-227
0.8971
1.7939
0.9877
Bignose shark
(Carcharhinus altimus)
10
174
132-228
148
112-192
0.8074
7.7694
0.9872
Silky shark
(C. falciformis)
15
173
90-258
142
73-212
0.8388
-2.6510
0.9972
Dusky shark
(C. obscurus)
148
153
92-330
125
74-277
0.8396
-3.1902
0.9947
Sandbar shark
(C. plumbeus)
3734
123
51-249
103
42-211
0.8175
2.5675
0.9933
Night shark
(C. signatus)
38
154
72-235
130
60-195
0.8390
0.5026
0.9883
Tiger shark
(Galeocerdo cuvier)
44
247
145-375
203
116-318
0.8761
-13.3535
0.9887
Blue shark
(Prionace glauca)
572
214
64-337
179
52-282
0.8313
1.3908
0.9932
Scalloped hammerhead
(Sphyrna lewini)
111
206
82-278
160
64-216
0.7756
-0.3132
0.9868

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(File Modified Nov. 19 2010)