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Seasonal morphophysiological changes during the reproductive cycle of the tripletail fish Lobotes surinamensis (Perciformes: Lobotidae) in the western South Atlantic

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Abstract

The tripletail Lobotes surinamensis inhabits tropical and subtropical oceans, including the South Atlantic, where information about its reproductive biology is scarce. We combined physiological and morphological tools to study the reproductive cycle of L. surinamensis in the western South Atlantic. Adult females and males were sampled in Paraty Bay (Rio de Janeiro, southeastern Brazil) for 2 years, and the animals were grouped into three seasons: spring, summer, and autumn/winter. Gonadal morphology, plasma levels of gonadal steroids, 17β-estradiol (E2), 11-ketotestosterone (11-KT), and 17α-hydroxyprogesterone (17α-OHP) were quantified in females, and testosterone (T) and 11-KT were quantified in males. The gene expression of the β subunit of pituitary gonadotropins, luteinizing hormone (LH), and follicle-stimulating hormone (FSH) were evaluated in all seasons. The histological analysis of the gonads showed that L. surinamensis is a multiple spawner with an asynchronous oocyte development. The gene expression of fshβ did not change throughout the reproductive cycle in males and females, while the gene expression of lhβ in males was higher in the summer compared to the autumn/winter periods. Plasma E2 was higher in females and 11-KT in males during spring. Gonadal development, plasma level of E2 (females), and 11-KT (males) are indicators that L. surinamensis reproduce during the spring and summer in Paraty Bay, while the gene expression levels of gonadotropins in females and fshβ in males were not useful physiological tools to establish the reproductive season. The results suggest an active expression throughout the year, a profile expected in multiple spawning species, as proposed here for the L. surinamensis.

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Source: Sistema de Coordenadas Geográficas; Datum SIRGAS 2000; Bases Cartográficas, IBGE, 2019, Google image maps

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Data available from the authors by request.

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Acknowledgements

The authors would like to thank the local fisher from Itaca Island, Paraty Bay, and to the LAMEROA team (Laboratório de Metabolismo e Reprodução de Organismos Aquáticos, Instituto de Biociências, Universidade de São Paulo) for their help with sample collection of animals.

Funding

This research was funded by the following grants (financial and technical assistance): FAPESP 2014/16320–7, 2017/10971–4 and 2017/06765–0 (Fundação de Amparo à Pesquisa do Estado de São Paulo). RGM is recipient of a CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) productivity scholarship. CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) Finance Code 001.

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All authors contributed to study conception, design, laboratory work, data evaluation, formal analysis, and writing, reviewing, and editing the manuscript. Fieldwork was performed by KRCF and CEOG.

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Correspondence to Renata Guimarães Moreira.

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The captures were authorized by the Brazilian National Institute for Biodiversity Conservation (ICMBio) (authorization nº 41371). Field collection, euthanasia, and preservation of fish were approved by the Animal Ethics Committee of the University of São Paulo (Protocol nº 320).

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The authors declare no competing interests.

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Fagundes, K.R.C., Honji, R.M., Escalante-Rojas, M.C. et al. Seasonal morphophysiological changes during the reproductive cycle of the tripletail fish Lobotes surinamensis (Perciformes: Lobotidae) in the western South Atlantic. Environ Biol Fish 104, 779–796 (2021). https://doi.org/10.1007/s10641-021-01115-6

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  • DOI: https://doi.org/10.1007/s10641-021-01115-6

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