Phenotypic Variability in Dorsal-fin Rays of Rachycentron canadum (Linnaeus, 1766) from Western, Visayas, Philippines

Author:

Cabebe-Barnuevo Roxanne1ORCID,Penuela Dianne Frances2ORCID,Mediodia Dominique1ORCID,Babaran Ricardo1ORCID,Malay Maria Celia2ORCID

Affiliation:

1. Institute of Marine Fisheries and Oceanology, College of Fisheries and Ocean Sciences, University of the Philippines Visayas

2. Marine Biodiversity and Evolution Lab, Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas

Abstract

Cobia, Rachycentron canadum, is the only species in the family of Rachycentridae. Cobia is typically characterized as having 26–33 dorsal-fin rays. However, an investigation of specimens collected from Western Visayas waters revealed a wider variation in dorsal-fin ray count than previously reported, with some specimens having 35–36 dorsal-fin rays. Suspecting a possible cryptic species, we compared the mitochondrial cytochrome oxidase subunit 1 (COI) sequence for specimens with 35–36 dorsal-fin rays with those having the more typical 26–33 dorsal-fin rays. The sequences revealed no genetic differences between the two morphs. Morphometric measurements and meristic counting likewise found no significant differences. This is the first report of phenotypic variability in the dorsal-fin rays in Cobia. As a result of the phenotypic and genotypic characterization presented in this work, fisheries scientists and ichthyologists will be more aware of the existence of phenotypic variability in Cobia.

Funder

University of the Philippines

Publisher

National Fisheries Research and Development Institute

Subject

Aquatic Science

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