Biodiversity Data Journal :
Research Article
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Corresponding author: Gustavo Freire de Carvalho-Souza (gustavo.souza@csic.es)
Academic editor: Felipe Ottoni
Received: 11 Feb 2024 | Accepted: 25 Apr 2024 | Published: 14 May 2024
© 2024 Gustavo de Carvalho-Souza, Cristóbal Gómez, Enrique González-Ortegón
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
de Carvalho-Souza G, Gómez C, González-Ortegón E (2024) A non-native fish species reaches the south-western European waters: the Atlantic croaker, Micropogonias undulatus (Acanthuriformes, Sciaenidae) and its invasion history in Europe. Biodiversity Data Journal 12: e120736. https://doi.org/10.3897/BDJ.12.e120736
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The Atlantic croaker Micropogonias undulatus, a sciaenid fish native to the North Atlantic American coast, holds importance in recreational and commercial fisheries. Moreover, its potential as an invasive species should be noted, given its expansion and establishment in Atlantic European waters. This study reports its southernmost occurrence in Europe, in the Gulf of Cadiz. Morphological and molecular analysis confirmed its identity, revealing genetic similarities to US sequences. A comprehensive review of historical non-native distribution records underscored the species' expansion throughout European waters, suggesting human-mediated introduction. The escalating frequency of such arrivals emphasises the critical need for effective monitoring and management efforts in order to control non-native species in this region.
alien species, biological invasion, exotic species, first record, Iberian Peninsula, sciaenid fish
The phenomenon of biological invasions is universally acknowledged as an important component of human-induced environmental transformations, closely linked to the globalisation of the economy and the expansion of human populations (
In the Gulf of Cadiz (GoC), the proliferation of non-native species (NNS) has steadily increased since 1980 (
Another non-native species reported in European waters is the Atlantic croaker, Micropogonias undulatus (Linnaeus, 1766), a sciaenid fish. First observed near Ostend, Belgium, in 1998 (
The Micropogonias undulatus is an euryhaline demersal inshore species that predominantly inhabits the bottom zones of mixed environments, including mud, sand and shell substrates, as well as areas with sponge and coral (
In this paper, we report the first occurrence of M. undulatus on the European south coast, near the mouth of the Guadalquivir Estuary in the Gulf of Cadiz, expanding its non-native range, previously restricted to the Greater North Sea. This represents the southernmost record of the species in the Eastern Atlantic at the moment.
A single specimen was caught with trammel nets by local fishermen (vessel Maria Mar Primera; ESP000024745) in the Gulf of Cadiz (SW Spain). This capture took place during a commercial fishing operation conducted near the mouth of the Guadalquivir River (
DNA was extracted from fin tissue using the Omega Bio-tek protocol (E.Z.N.A.® Tissue DNA Kit). Fragments of the mitochondrial gene cytochrome c oxidase subunit 1 (COI) were amplified with the primers FishF2 (5’ TCGACTAATCATAAAGATATCGGCAC 3’) and FishR2 (5’ ACTTCAGGGTGACCGAAGAATCAGAA 3’) (
The COI partial sequence (582 bp) of one specimen was generated (Genank accession number OR906314; Suppl. material
To review the non-native occurrence records of M. undulatus, we conducted a comprehensive bibliographic research, compiling and updating records. The search encompassed literature published from 1970 to November 2023, sourced from the Web of Science database, Scopus and Google Scholar. The search employed the following keywords (and/or): “Micropogonias undulatus”, “Perca undulata”, “Atlantic croaker”, “first record”, “occurrence”, “range expansion”, “non-native”, “exotic”, “alien”. Additional bibliographic sources were obtained by reviewing the reference lists of the located publications. Furthermore, the information was cross-verified with reports from the ICES' Working Group on Introductions and Transfers of Marine Organisms (WGITMO) published from 1972 to 2022, data obtained from the GBIF database (https://www.gbif.es) and citizen-science platforms (e.g. iNaturalist.com, Waarneming.nl and Observadoresdelmar.es).
The first-ever record of the Atlantic croaker Micropogonias undulatus in the south-western Atlantic European waters is reported in this study, specifically near the mouth of the Guadalquivir Estuary within the Gulf of Cadiz. This specimen measured 41.5 cm, weighed 1.05 kg and was captured on 13 July 2023 (Table
Measurements and counts of specimens of Micropogonias undulatus: Belgian coast, Schelde Estuary (
Measure (mm) or count | Belgian coast ( |
Schelde ( |
Gulf of Cadiz (Present study) |
Total length | 146 | 132.7 | 410.5 |
Fin rays | |||
dorsal | IX+I, 26 | IX+I, 29 | X+I, 29 |
anal | II, 8 | II, 7 | II, 8 |
pelvic | R4, L5 | 6 | 6 |
pectoral | 17 | 17 | 17 |
Weight (g) | / | 20.8 | 1050 |
Partial COI sequence obtained from the analysed specimen (OR906314, submitted to GenBank; https://www.ncbi.nlm.nih.gov/nuccore/OR906314) shows a 99.31% similarity to 28 sequences (Suppl. material
The compilation conducted here demonstrates at least 23 confirmed records of Atlantic croaker occurrences in European Atlantic waters (Table
Historical occurrence records of Atlantic croakers, Micropogonias undulatus in its European non-native range. Acronym: N - Number of individuals; TL - Total length (cm). *Coordinates estimated from record description.
Year |
N |
Locality |
Latitude |
Longitude |
TL (cm) |
Reference |
August 1998 |
1 |
Westerschelde Estuary, Belgian waters |
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14.6 |
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October 2001 |
1 |
Scheldt Estuary, Belgian waters |
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13.2 |
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October 2003 |
1 |
Wadden Sea, Dutch waters |
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16 |
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October 2004 |
2 |
North Sea Canal |
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16.4-17.2 |
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August 2005 |
1 |
Belgian coastal waters |
- |
- |
19 |
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2006 |
1 |
Rotterdam, Dutch waters |
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- |
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2007 |
5 |
Amsterdam, Dutch waters |
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- |
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2007 |
2 |
Reimerswaal, Dutch waters |
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- |
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2007 |
2 |
Velsen, Dutch waters |
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- |
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2007 |
2 |
Zaanstad, Dutch waters |
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- |
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December 2008 |
1 |
Amsterdam, Dutch waters |
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- |
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December 2008 |
1 |
North of Skagen, Danish waters |
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25 |
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September 2013 |
1 |
Texel-Mokbaai- Estuary (North Holland) |
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18 |
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August 2014 |
1 |
Scheldt-Rhine Canal |
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26 |
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September 2014 |
1 |
Texel-Mokbaai- Estuary (North Holland) |
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- |
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2014 |
1 |
Scheldt-Rhine Canal |
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- |
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August 2015 |
1 |
Europoort/Rotterdam, Dutch waters |
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30.5 |
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September 2016 |
1 |
North Sea Canal |
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43 |
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September 2017 |
1 |
Rotterdam, Dutch waters |
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37 |
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2018 |
1 |
Nordsøen/Skagerrak, Danish waters |
- |
- |
- |
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September 2020 |
2 |
Texel- Mokbaai- NIOZ fyke |
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33 |
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October 2020 |
1 |
off Plymouth |
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28.5 |
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July 2023 |
1 |
Gulf of Cadiz, Spain |
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41.5 |
Present record |
In the Gulf of Cadiz, a significant number of non-native species (NNS) is attributed to the northward expansion range in response to warming conditions (
To date, including the present finding, two non-native sciaenid species that have possibly been introduced in ballast water of ships are known along the GoC. One of them, C. regalis, has been established since 2011 in the Gulf of Cadiz and 2014 in the Sado Estuary through multiple and independent events, possibly dispersing to adjacent areas (
The present observation of M. undulatus represents the first record for the Gulf of Cadiz and the second ecoregion in European waters (
The absence of information regarding whether the specimen found here indicates a population spread from the Belgian/Dutch waters, where this fish may have established, introduces a degree of uncertainty about its origin. Nevertheless, it is unlikely that individuals introduced into the European North would have migrated southwards to colonise the Gulf of Cadiz without being observed in ecosystems situated between these regions.
The likely arrival route was through ballast water, given the substantial distances from its origin zone and prior invasions (Fig.
Records of the Atlantic croaker, Micropogonias undulatus, in the Atlantic waters are depicted on the map. White dots indicate native locations of M. undulatus in the western Atlantic Ocean. Red dots indicate previous non-native locations of M. undulatus in the Greater North Sea, while the red triangle marker indicates the location of the M. undulatus recorded in the Gulf of Cadiz during this study (Rota, near the mouth of the Guadalquivir Estuary). White arrows indicate the probable route of arrival through ballast water.
The capture of a single individual suggests that the Atlantic croakers in the Gulf of Cadiz may not be fully established, in contrast to the robust growth and active fishing observed for C. regalis (
On the other hand, the Guadalquivir Estuary is recognised as an important nursery area and essential fish habitat for numerous commercial species, such as the European anchovy (Engraulis encrasicolus), sardine (Sardina pilchardus), seabass (Dicentrarchus labrax),and shrimps (Palaemon spp.) (
Given these favourable conditions in the Estuary, it is necessary to initiate proactive control measures and potential eradication efforts early, as the species is not yet completely established in the Gulf of Cadiz. This observation underscores the continued importance of monitoring the arrival and dispersion of NNS in the Gulf of Cadiz, as well as the need for effective measures in ecosystem-based NNS management.
The data underpinning the analysis reported in this paper are deposited at GBIF, the Global Biodiversity Information Facility, https://ipt.pensoft.net/resource?r=micropogonias_undulatus_occurrence_records_europe.
The authors would like to thank the fishermen who provided record and fishing information. We also thank Bruno Almón for support with the DNA sequences. GF de C-S acknowledges support from the Spanish Ministry of Universities for the Margarita Salas Postdoctoral Fellowship funded through the Next Generation EU programme (UCA/R155REC/2021) and Spanish State Research Agency (PTA2022-021378-I). We thank the editor and three reviewers for their helpful suggestions to improve the manuscript.
GF de C-S and EG-O conceived the study and contributed to the study design. GF de C-S, and EG-O analysed the data and wrote the paper. All authors contributed to drafting and editing. All authors read and approved the final manuscript.
Published records in GenBank of Micropogonias undulatus cytochrome c oxidase subunit I (COI) gene.