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How to determine the size of a tuna
In mearsuring tunas total curved fork length is the sole criterion for determining the size class of whole (head On) Atlantic tunas for regulatory purposes. Curved fork length means a measurement of the length of a tuna taken in a line tracing the contour of the body from the tip of the upper jaw to the folk of the tail,which abuts the bottom side if the pectoral fin and the bottom side of the caudal keel. The measuring tape must touch at this point.

Reference Key

Bluefin Gill rakers 34-43 Pectoral fin very short Liver Striated

Yellowfin Gill rakers 26-35 Pectoral fin extends beyond origin of second dorel fin Liver is without Striations

Bigeye Gill rakers 23-31 Pectoral fin reaches origin of second doral fin Liver is Striated

Albacore Gill rakers 25-32 Pectoral fin extends beyond the anal fin

Bonito Gill rakers 16-23 Pectoral fin is very short,several dark stripes on its side

Little Tunny GIll rakers 37-43 Pectoral fin very short and broad Wavy lines on its back

Other regulatory size classes are as follows (Bluefin Tuna):
Size ClassCurved fork lengthApprox. Round Weight
Young school<27 "<14 lbs
School27 - <45 "14 - <66 lbs
Large School45 - <57 "66 - <135 lbs
Small Medium57 - <70 "135 - <235 lbs
Large Medium70 - <73 "235 - <310 lbs
Giant73" or >310 lbs or >

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