Atlantic Tuna Reference Key - Noreast.com
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Reference Key To Atlantic Tuna

Species
Gill Rakers on first gill arch
Markings on lower body
Markings on upper body
Trailing Edge of Caudal Fin
Bottom surface of Liver
Pectoral Fin Length
Finlets
Length (fork length) and Weight Maximum
Bluefin
34-43
Gray spots and bands, sometimes resembles treebark
none
not white
striated
Very short; does not reach origin of second dorsal fin
Yellow , often with narrow black margin
118+ inches 1000 + pounds
Yellowfin
26-35
Chains (20+) of white streaks and spots
Yellow gold band on sides, fading at death
not white
Without striations
Extends beyond origin of second dorsal fin
Lemon yellow with a very narrow black margin
80 inches 400 pounds
Bigeye
23-31
none
none
not white
striated margin
Reaches origin of second dorsal fin
Yellow with black margin
90 inches 450 pounds
Albacore
25-32
none
none
white
striated
Extends beyond anal fin
Dorsal; yellowish anal; silver or dusky
50 inches 90 pounds
Bonito
16-23
none
Oblique dark stripes- seven or more
not white
without striations
very short
dusky
36 inches 20 pounds
Skipjack
53-63
4-6 dark longi-tudinal stripes on belly
none
not white
without striations
Very short and broad
dusky
40 inches 40 pounds
Blackfin
19-25
Alternating bars and spots, light in color
none
not white
without striations
Reaches origin of second dorsal fin
Uniformly dusky with white margins
40 inches 40 pounds
Little Tunny
37-43
Chest spots
Wavy lines on back
not white
without striations
short and broad
dusky
40 inches 35 pounds

 

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