Golden snapperLJH

 
Lutjanus Johnii
48.2 cm TL

Characteristic features:

  • Longitudinal scale rows above lateral line mostly horizontal
  • Large black spot usually present below dorsal-fin soft rays, mainly above lateral line

Colour:

Sides yellowish or silvery with reddish brown spot on each scale.

Size:

Up to 70 cm TL.

Distribution:

Indo-West Pacific in tropical waters.

Habitat:

Coral and rocky reefs, tolerating brackish waters in estuaries; from the surface to at least 80 m depth.

Biology:

Feeds primarily on fishes, but also crustaceans and cephalopods. Juveniles occur in mangrove areas and estuaries1, while adults have been observed schooling in turbid waters. Females grow to larger sizes than males. Size and age of maturity estimates vary depending on latitude and ageing techniques.2 In the coastal waters of northern Australia females reached first maturity between 54.9 and 69.0 cm FL, and between 6 and 9 years. Males reached first maturity between 59.0 and 62.0 cm FL, and between 6 and 10 years.3 In northern Australia, maximum age is estimated at 28 years.2

Fisheries:

Caught mainly with handlines, bottom longlines, traps, and bottom trawls.

Similar species:

 
Lutjanus monostigma
Onespot snapper
Lutjanus monostigma
Lutjanus monostigma differs in having longitudinal scale rows above lateral line obliquely positioned (vs. mostly horizontal) and dusky scale markings (vs. centre of each scale often with a reddish brown spot).
 
Lutjanus russellii
Russell’s snapper
26.0 cm TL
Lutjanus russellii differs in having longitudinal scale rows above lateral line obliquely positioned (vs. mostly horizontal) and a vomerine tooth patch without medial posterior extension (vs. with medial posterior extension).

External links:

FishBase
The IUCN Red List of Threatened SpeciesTM

References:

  1. 1.
    Kiso K, Mahyam M. Distribution and feeding habits of juvenile and young John’s snapper Lutjanus johnii in the Matang mangrove estuary, west coast of Peninsular Malaysia. Fisheries science [Internet]. 2003;69(3):563–8. Available from: https://doi.org/10.1046/j.1444-2906.2003.00657.x
  2. 2.
    Marriott R, Cappo M. Comparative precision and bias of five different ageing methods for the large tropical snapper Lutjanus johnii. Asian fisheries science [Internet]. 2000;13(2):149–60. Available from: http://epubs.aims.gov.au/11068/1477
  3. 3.
    Cappo M, Marriott RJ, Newman SJ. James’s rule and causes and consequences of a latitudinal cline in the demography of John’s Snapper Lutjanus johnii in coastal waters of Australia. Fishery Bulletin [Internet]. 2013;111(4):309–24. Available from: https://doi.org/10.7755/FB.111.4.2