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Tilapia venturing into high-salinity environments: A cause for concern?

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Abstract

Invasive species are continuously introduced in several ecosystems from human activities. Aquaculture activities are noteworthy among the many different species introduction vectors currently in place, generating a pattern of constant, frequent or massive release of propagules into aquatic ecosystems, increasing species establishment success rates. Reported cases in marine or brackish ecosystems, however, are still scarce. As aquaculture constantly generate propagules with the ability to employ these facilities as corridors to further spread to interconnected brackish and freshwater ecosystems, colonising high salinity systems, this study aimed to compile evidence of Tilapiines detected in Brazilian coastal marine and brackish ecosystems. Nineteen records were obtained, with the presence of this invader suggested as higher following rainfall seasons. The widespread distribution of Tilapiines is relatively well-known in Brazilian freshwater ecosystems but, up to now, its potential to use brackish and marine ecosystems as ecological corridors has been described only experimentally. Our findings highlight the potential for a typically freshwater invader to spread through marine ecosystems, raising concerns regarding the licensing of aquaculture projects within rivers and estuaries, as tilapia may significantly affect native Brazilian biota.

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Funding

This study was supported by the Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Brazil (postdoctoral fellowship to ACSF, E-26/202.423/2019) and National Council for Scientific and Technological Development (research grant to JRSV 302367/2018-7). MOF, AAB, and JRL thank the Meros do Brasil Project, sponsored by Petrobras.

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Contributions

ACSF and JRSV contributed to the study's conception and design. Data collection was performed by all authors. The first draft of the manuscript was written by ACSF. English review was performed by RAH-D. All authors read and approved the final version of the manuscript.

Corresponding author

Correspondence to Ana Clara Sampaio Franco.

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The authors have no competing interests to declare that are relevant to the content of this paper.

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Communicated by Lorena Silva Nascimento.

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Franco, A.C.S., Azevedo-Santos, V.M., Nogueira, M.A.M.d. et al. Tilapia venturing into high-salinity environments: A cause for concern?. Aquat Ecol 58, 47–55 (2024). https://doi.org/10.1007/s10452-023-10069-z

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  • DOI: https://doi.org/10.1007/s10452-023-10069-z

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