| Age, growth, and natural mortality of schoolmaster (Lutjanus apodus) from the southeastern United States - :15429 | National Marine Fisheries Service (NMFS)
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Age, growth, and natural mortality of schoolmaster (Lutjanus apodus) from the southeastern United States
  • Published Date:
    2016
  • Source:
    Peerj, 4, e2543.
Filetype[PDF-1.65 MB]


Details:
  • Description:
    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 x 10(-6) 11(3.11) (n = 256, r(2) = 0.95); W = 2.13 x 10(-5) FL2.99 (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 (ri = 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))) = 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.

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