Early sex shape dimorphism (SShD) in Rachycentron canadum (Linnaeus, 1766) and its applications for monosex culture

Wagner Franco Molina, Daniel D Benetti, Julian Nicholas Fiorentino, Paulo Augusto de Lima-Filho, Carlos Eduardo Rocha Duarte Alencar, Gideão Wagner Werneck Félix da Costa, Clóvis Coutinho da Motta-Neto, Marcelo Francisco de Nóbrega

Research output: Contribution to journalArticle

Abstract

Rachycentron canadum (cobia) is a species that has attracted the interest of the marine fish farming industry due to displaying numerous traits favorable to cultivation. The species is characterized by its large size, rapid growth, robustness and established technological support for cultivation. Cobia shows sexual size dimorphism (SSD) as adults, with females being significantly larger than males. In fish, sexual dimorphism related to morphology can be the result of ecological, functional, or adaptive selection. Methodologies that allow the application of monosex cultures increase both the biotechnological and production potential of a species. With a view to establishing parameters for early sex determination in R. canadum, morphological analyses were conducted in juveniles aged 139 days (4.6 months) using geometric morphometrics. Sexual shape dimorphism (SShD) in female cobia is expressed by an elongated body and extended space between pectoral and anal fins, suggesting fecundity-related morphological adaptations. The results are promising and indicate a high index of early sex discrimination using geometric morphometrics, demonstrating the possibility of developing routine protocols that can be applied to increase species production.

Original languageEnglish (US)
Pages (from-to)320-327
Number of pages8
JournalAquaculture
Volume495
DOIs
StatePublished - Oct 1 2018

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Keywords

  • Cobia
  • Gender selection
  • Marine fish farming
  • Sexual dimorphism

ASJC Scopus subject areas

  • Aquatic Science

Cite this

Molina, W. F., Benetti, D. D., Fiorentino, J. N., Lima-Filho, P. A. D., Alencar, C. E. R. D., Costa, G. W. W. F. D., Motta-Neto, C. C. D., & Nóbrega, M. F. D. (2018). Early sex shape dimorphism (SShD) in Rachycentron canadum (Linnaeus, 1766) and its applications for monosex culture. Aquaculture, 495, 320-327. https://doi.org/10.1016/j.aquaculture.2018.05.056