Abstract
The spatio-temporal delimitation of fish reproduction is essential for the appropriate management and conservation strategies in populations. Assessing this feature in Antarctic Ichthyology is particularly difficult because harsh environmental conditions limit sample collection. This study shows how physiology can contribute compelling evidence to understand reproduction in Antarctic fish using the notothenioid Lepidonotothen nudifrons as a model species. Sampling included 121 specimens caught at Potter Cove (PC), South Shetland Islands (SSI), from November to late March of 2016–2018. Gonadal macroscopic and histologic features are reported. Oocyte growth and change in testosterone and estradiol plasma levels throughout the ovarian growth of L. nudifrons adult females is provided. In March, females (n = 17) attained gonado-somatic index of 13–20% (16.73 ± 4.20), total fecundity of 2196–4652 oocytes/female, the leading clutch oocytes measured 1.7–2.1 mm, and males (n = 5) showed spermatozoids in their testicles. The leading clutch growth was significantly associated with photoperiod, with no diameter variation until the summer solstice, when it began to grow linearly with an estimated rate of 0.01 mm/day. Testosterone and estradiol increased together with the oocyte growing throughout the analysed months, with a higher rate of increase during March. The reproductive effort data, and especially the significant plasma level increase in both sex steroids observed in March, suggest that (1) females were at a late vitellogenesis stage, just prior to the oocyte final maturation, and thus L. nudifrons spawning period might begin in March at SSI; (2) PC is likely a spawning site for L. nudifrons, which indicates that nearshore areas are spawning grounds for some notothenioids.
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Acknowledgements
We are grateful to Carlos Bellisio, Rodrigo Varela and Facundo Robino for their help in field activities and laboratory tasks, to Marta Estrada and Hugo Brachetta for the histological section preparation, and to Patricia Estofan for her help in the sex steroid measurements. Prof. Joseph Eastman helped with the English edition of the manuscript. We thank three referees,Drs. Thomas Desvignes, Nathalie Le François, and Vladimir Laptikhovsky, whose comments improve the quality of this work. INIDEP contribution N° 2242.
Funding
This work was supported by grants from Dirección Nacional del Antártico, Instituto Antártico Argentino [Grant Number PICTA 0100], Consejo Nacional de Investigaciones Científicas y Técnicas [Grant Number PIP2017-2019: 11220170100219CO, Resolution 2018-8-APN-DIR#CONICET] and Fondo para la Investigación Científica y Tecnológica [Grant Number PICT 2018:03310, Resolution 401/19].
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MN, EBO, ME and EM planned and designed the research. MN and EM conducted fieldwork and carried out laboratory work. ME and MN performed statistical analyses. GM, MN and ME analyzed the histological slides. MN, EBO and ME led the writing of the manuscript with contributions from GM and EM.
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All procedures involving Lepidonotothen nudifrons specimens have followed all applicable appropriate international, national and institutional guidelines for the collection, care, and ethical use of research organisms and material. All necessary approvals were obtained. Sampling was performed under the permit granted by the Dirección Nacional del Antártico (Environmental Management Office).
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Novillo, M., Elisio, M., Moreira, E. et al. New insights into reproductive physiology in Antarctic fish: a trial in Lepidonotothen nudifrons. Polar Biol 44, 1127–1139 (2021). https://doi.org/10.1007/s00300-021-02879-4
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DOI: https://doi.org/10.1007/s00300-021-02879-4