Reproductive traits of the European catfish, Silurus glanis, during the early stages of invasion

Gkenas, C.; Sequeira, V.; Ribeiro, D.; Gago, João; Dias, D.; Verma, C.R.; Kumkar, P.; Ribeiro, F.

Publication

Reproductive traits of the European catfish, Silurus glanis, during the early stages of invasion

2025-02Journal article

dc.contributor.author	Gkenas, C.
dc.contributor.author	Sequeira, V.
dc.contributor.author	Ribeiro, D.
dc.contributor.author	Gago, João
dc.contributor.author	Dias, D.
dc.contributor.author	Verma, C.R.
dc.contributor.author	Kumkar, P.
dc.contributor.author	Ribeiro, F.
dc.date.accessioned	2025-04-14T14:39:19Z
dc.date.available	2025-04-14T14:39:19Z
dc.date.issued	2025-02
dc.description.abstract	In recent decades, the European catfish Silurus glanis has spread across Europe and elsewhere, significantly impacting the native fauna of the recipient ecosystems. Studies on its reproductive traits from its non-native range are limited, although this is a critical step in developing effective management plans. Here, we explore the reproductive characteristics of invasive European catfish populations in the Lower River Tagus in Portugal, focusing on its sex ratio, size at maturity, spawning period, fecundity and oocyte diameter. European catfish were collected monthly by electrofishing, gill nets, baited hooks, and professional fishermen from January 2022 to November 2023. A total of 217 females, 156 males and 301 immature fish were analysed. The female-to-male sex ratio was 1.4 : 1, with females and males reaching size at first maturity (TL50) at 72.9 and 68.8 cm total length, respectively. The spawning season was protracted, from February to June, showing asynchronous oocyte development patterns. The absolute fecundity was positively correlated with total length and total weight and ranged from 8,364 to 319,000 oocytes. Relative fecundity varied from 4.39 to 23.53 oocytes, with the mean diameter of the matured oocytes ranging from 1.50 to 3.21 mm. The results obtained in this study enhance our understanding of the reproductive biology of invasive species and can contribute to the development of effective management strategies, such as population control and density- dependent fecundity strategies.	eng
dc.identifier.citation	Gkenas, C.; Sequeira, V.; Ribeiro, D.; Gago, J.; Dias,D.; Verma, C.R.; Kumkar, P. & Ribeiro, F. (2025) Journal of Vertebrate Biology 74 (24122), 24122.1-16, https://doi.org/10.25225/jvb.2412
dc.identifier.doi	https://doi.org/10.25225/jvb.24122
dc.identifier.issn	2694-7684
dc.identifier.uri	http://hdl.handle.net/10400.15/5761
dc.language.iso	eng
dc.peerreviewed	yes
dc.publisher	Inst Vertebrate Biology as CR
dc.relation	FCT - PTDC/CTA-AMB/28782/2017
dc.relation	FCT - PTDC/ASP-PES/4181/2021
dc.relation	FCT - DL57/2016/CP1479/CT0036
dc.relation	FCT - CEEC/0482/2020
dc.relation	FCT - CEECIND/02705/2017
dc.relation	EC - EU LIFE Nature & Biodiversity 422 Project programme
dc.relation	EC - EU LIFE Nature & Biodiversity UIDB/04292/2020
dc.relation	EC - EU LIFE Nature & Biodiversity LA/P/0069/2020
dc.relation	MARE base funding UIDB/04292/2020
dc.relation	MARE base funding LA/P/0069/2020
dc.relation.hasversion	https://bioone.org/journals/journal-of-vertebrate-biology/volume-74/issue-24122/jvb.24122/Reproductive-traits-of-the-European-catfish-Silurus-glanis-during-the/10.25225/jvb.24122.full
dc.rights.uri	http://creativecommons.org/licenses/by/4.0/
dc.subject	Siluridae
dc.subject	size at maturity
dc.subject	gonadosomatic index
dc.subject	fecundity
dc.subject	oocyte diameter
dc.subject	asynchronous spawner
dc.title	Reproductive traits of the European catfish, Silurus glanis, during the early stages of invasion	eng
dc.type	journal article
dspace.entity.type	Publication
oaire.citation.endPage	16
oaire.citation.issue	24122
oaire.citation.startPage	1
oaire.citation.title	Journal of vertebrate biology
oaire.citation.volume	74
oaire.version	http://purl.org/coar/version/c_970fb48d4fbd8a85