Rapid and reliable multivariate discrimination for two cryptic Eteline snappers using otolith morphometry

Wakefield, Corey B., Williams, Ashley, Newman, Steve J., Bunel, Melanie, Dowling, Christopher E., Armstrong, Chella A., and Langlois, Tim J. (2014) Rapid and reliable multivariate discrimination for two cryptic Eteline snappers using otolith morphometry. Fisheries Research , 151. pp. 100-106.

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Abstract

Previously unaccounted cryptic speciation requires revaluating species identification, particularly for fisheries assessment purposes. We describe a rapid and reliable method for distinguishing between phenotypically similar species that utilizes simple otolith morphometry (length, width, thickness and weight) with or without fish length, within a traditional canonical discriminant analysis (CDA). Data were subject to CDA in order to differentiate between the cryptic Etelis carbunculus (ruby snapper) and E. marshi (pygmy ruby snapper). A very high allocation success rate was achieved using otolith mor-phometry and fork length (99.6% for E. carbunculus and 100% for E. marshi) or otolith morphometry only(98.8% for E. carbunculus and 100% for E. marshi), which indicated the high discriminatory power of this method. The CDA successfully grouped samples of the same species collected from different locations in the eastern central Indian and South Pacific Oceans, indicating the robustness of this technique to discriminate between species, irrespective of their geographic range. This technique can be applied to archived otolith collections to confirm teleost species identification, and likely has broader applications for species identification involving extractive, diet or video-based studies.

Item ID: 31862
Item Type: Article (Research - C1)
ISSN: 0165-7836
Keywords: Etelis carbunculus, E. marshi, canonical discriminant analysis, morphometrics, deepwater teleosts, species identification, speciation
Funders: Department of Fisheries, Western Australia, Secretariat of the Pacific Community (SPC), New Caledonia, Australian Agency for International Development (AusAID)
Date Deposited: 26 May 2015 05:23
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070405 Fish Physiology and Genetics @ 100%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8302 Fisheries - Wild Caught > 830204 Wild Caught Fin Fish (excl. Tuna) @ 100%
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