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Ages of schoolmaster ( n  = 136) from the southeastern Florida coast from 1981–2015 were determined using sectioned sagittal otoliths. Opaque zones were annular, forming March–July (peaking in May–June). Schoolmaster ranged in age from 1–42 years; the largest fish measured 505 mm total length (TL) and was 19 years old. The oldest fish measured 440 mm TL. Estimated body size relationships for schoolmaster were:  W  = 9.26 × 10 −6   TL  3.11  ( n  = 256,  r  2  = 0.95);  W  = 2.13 × 10 −5   FL  2.99  ( n  = 161,  r  2  = 0.95);  TL  = 1.03  FL  + 10.36 ( n  = 143,  r  2  = 0.99); and  FL  = 0.96  TL  − 8.41 ( n  = 143,  r  2  = 0.99), where  W  = whole weight in g,  FL  = fork length in mm, and TL in mm. The fitted von Bertalanffy growth equation was:  L   t   = 482 (1 −  e  −0.12( t +2.79) ) ( n  = 136). Based on published life history relationships, a point estimate of natural mortality for schoolmaster was  M  = 0.10, while age-specific estimates of  M  ranged from 1.57–0.18 for ages 1–42.

Age, growth, and natural mortality of schoolmaster (Lutjanus apodus) from the southeastern United States