lengths are in millimeters. ages groups are in years Convert them to inches if you want.
For reference a 30 lb yt is about 1020 mm~ 8 years old approx.
Note: figure from
STATE OF CALIFORNIA DEPARTMENT OF FISH AND GAME
MARINE RESOURCES OPERATIONS
FISH BULLETIN No. 110
A Study of The Yellowtail Seriola Dorsalis
http://content.cdlib.org/view?docId=...ew=entire_text