Bigtooth corvine, Isopisthus parvipinnis, population structure in Southeast Brazilian coast inferred from otolith shape analysis

Abstract

Event Abstract Back to Event Bigtooth corvine, Isopisthus parvipinnis, population structure in Southeast Brazilian coast inferred from otolith shape analysis Natasha T. Hoff1, 2, June F. Dias3, Maria De Lourdes Zani-Teixeira3 and Alberto T. Correia2, 4* 1 Graduate Program in Oceanography, Oceanographic Institute, University of São Paulo, Brazil 2 Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR), Portugal 3 Department of Biological Oceanography, Oceanographic Institute, University of São Paulo, Brazil 4 Faculdade de Ciências da Saúde, Universidade Fernando Pessoa, Portugal Isopisthus parvipinnis (Cuvier, 1830), commonly known as “bigtooth corvina” (in Portuguese: tortinha or pescadinha), is one of the main species of extractive fisheries in Brazil, primarily in Southeast and Southern regions. The aim of this work was to investigate the population structure and temporal stability of I. parvipinnis in SW Atlantic Ocean, between São Paulo and Paraná (Brazil), through otolith shape analysis. Individuals with 80 to 140 mm total length were obtained from historical samples (1975, Nectonic Fauna – Oceanographic Institute of the University of São Paulo) and commercial catches (2018, artisanal fleets) in the shallow waters of the Brazilian Southeast and South coast, between São Paulo (North - NSP, Central - CSP, and South – SSP) and Paraná (PR). After photographed, each otolith was described using otolith shape indices (SIs) and elliptical Fourier descriptors (EFDs). ANCOVA was used to length-detrend SIs. Variations between locations were tested using univariate analysis, while variation between locations and years were analyzed with multivariate analysis. Data showed differences in the otolith shape analysis for the tested years. Fish sampled in 1975 showed an overall low re-classification rate (33%) because of a high overlap of individuals within sampling locations. However, samples from 2018 allowed the discrimination of three distinct spatial groups with a good overall correct re-classification (73%): group 1 with samples from the NSP; group 2 with samples from the CSP; and group 3 with samples from SSP and PR. The hereby data suggests temporal and spatial changes in the population dynamics of this species. Further studies, using other complimentary tools, are however need to corroborate these findings. Acknowledgements This work was supported by a PhD scholarship funded by CNPq (163116/2015-6) and PDSE - CAPES (88881.189862/2018-01), and partially supported by the Strategic Funding UID/Multi/04423/2019 through national funds provided by Foundation for Science and Technology (FCT) and European Regional Development Fund (ERDF), in the framework of the programme PT2020. Authors thank to Marcelo Soeth (CEM - UFPR) and Rafael Shroeder (UFSC) for sampling support. Keywords: Sciaenidae, sagittae, Otolith shape indices, Elliptic Fourier descriptor (EFD), Population units Conference: XVI European Congress of Ichthyology, Lausanne, Switzerland, 2 Sep - 6 Sep, 2019. Presentation Type: Poster Topic: OTOLITHS AS A TOOL TO STUDY FISH LIFE CYCLES Citation: Hoff NT, Dias JF, Zani-Teixeira M and Correia AT (2019). Bigtooth corvine, Isopisthus parvipinnis, population structure in Southeast Brazilian coast inferred from otolith shape analysis. Front. Mar. Sci. Conference Abstract: XVI European Congress of Ichthyology. doi: 10.3389/conf.fmars.2019.07.00161 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 23 Jul 2019; Published Online: 14 Aug 2019. * Correspondence: Prof. Alberto T Correia, Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR), Matosinhos, Portugal, atcorreia.ciimar@gmail.com Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Natasha T Hoff June F Dias Maria De Lourdes Zani-Teixeira Alberto T Correia Google Natasha T Hoff June F Dias Maria De Lourdes Zani-Teixeira Alberto T Correia Google Scholar Natasha T Hoff June F Dias Maria De Lourdes Zani-Teixeira Alberto T Correia PubMed Natasha T Hoff June F Dias Maria De Lourdes Zani-Teixeira Alberto T Correia Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.