Authors : Rodrigues Maciel, André Martins Vaz-dos-Santos, José Ricardo de Souza Barradas, and Marcelo Vianna
Magazine : Neotropical Ichthyology, 17(1): e180101, 2019
Published online : 25 April 2019 (ISSN 1982-0224)Copyright © 2019 Sociedade Brasileira de Ictiologia
Printed : 30 March 2019 (ISSN 1679-6225)
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PDF : http://www.scielo.br/pdf/ni/v17n1/1982- ... 180101.pdf
DOI : http://doi.org/10.1590/1982-0224-20180101
Keywords: Biphasic growth, Energy allocation, Growth models, lapillus otoliths, Morphometric relationshipsabstract wrote:Genidens genidens is a species susceptible to population declines in view of their reproductive biology peculiarities. Morphometric differences between sexes are observed in the literature, and these differences should also be evident in otolith development. Growth patterns are one of the most important biological characteristics regarding population dynamics and management. In this context, the aim of the present study is to describe this species relative growth and identify differences between sex life cycles. Somatic growth-otolith growth relationships and somatic length-weight relationships were estimated based on two methodologies; the Huxley and the polyphasic allometric models. Both models demonstrated different growth patterns between sexes. The three axes of otolith growth were adequate descriptors of growth, and the results of the Huxley model demonstrated distinct growth patterns between sexes, with male otoliths larger in all three measured axes. In the polyphase model, male otoliths were thicker, while female otoliths were longer and higher. Both sexes presented similar length-weight relationships, which may indicate that oocyte production and parental care lead to similar costs for this species.