BILLFISH FORMULA - LENGTH - WEIGHT FREQUENCIES
BLACK MARLIN   SAILFISH
cm kg   cm kg   cm kg
90 10   250 150   110 5
120 15   255 160   145 10
135 20   260 170   160 15
140 25   265 180   180 20
145 30   270 200   190 25
150 35   275 212   200 30
155 40   280 225   210 35
160 45   285 237   215 40
165 50   290 250   222 50
170 53   295 262   225 55
175 57   300 275      
180 60   305 287      
185 64   310 300      
190 67   315 316      
195 71   320 322      
200 75   325 350      
205 80   330 375      
210 85   335 400      
215 90   340 416      
220 95   345 432      
225 100   350 450      
230 110   355 466      
235 120   360 482      
240 130   365 500      
245 140            

 

1. Measure girth at thickest section and convert to inches
2. Measure length from lower jaw to middle of tail fork and convert to inches.
3. Square girth and multiply by length - Divide by 800

Example: Girth = 40" - squared = 1600
Length = 100"
Multiply girth squared x length (1600 x 100 = 16000) divide by 800 for a             weight of 200lbs