Otolith shape analysis of Lethrinus lentjan (Lacepède, 1802) and L. microdon (Valenciennes, 1830) from the Red Sea

Otolith outline Emperor fish Morphometry.

Authors

  • Yassein A.A. Osman
    yasseinahmed66@yahoo.com
    National Institute of Oceanography and Fisheries, NIOF, Egypt.
  • Sní¦björn Palsson Department of Life and Environmental Sciences, University of Iceland, Reykjaví­k, Iceland.
  • Ahmed F. Makkey National Institute of Oceanography and Fisheries, NIOF, Egypt.
May 31, 2021

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Otolith shape and morphology are used to identify fish species and population stocks. The aim of this study was to distinguish the Lethrinus lentjan (Lacepède, 1802) and L. microdon (Valenciennes, 1830) (family: Lethrinidae) using otolith shape. The analyses apply the ShapeR package in R which enables to extract the outline and otolith morphology from images and for statistical examining of individual variation. Otoliths of 165 individuals from the two Lethrinus species were collected during 2019 and 2020. The wavelet levels were examined by using 6 wavelets to collect 63 coefficients. The regression between width and fish length were b = -0.03 (t = 2.6, P = 0.01) for L. lentjan and was significantly different (t = 2.120, P = 0.036) for L. microdon (b = 0.018).