 The great northern tilefish is the largest species of the family Malacanthidae ; male specimens can grow up to 112 centimetres ( 44 in ) FL ( fork length ) and females to 100 centimetres ( 39 in ) FL . During their first four years of life , they grow at a rate of typically <unk> / yr after which their rate of growth slows down . They grow reach sexual maturity once they are between 50 and 70 centimetres ( 20 and 28 in ) in length Various studies have shown that the life expectancy of fish that survive into adulthood is in the range 25 – 35 years . 
