{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,24]],"date-time":"2026-04-24T19:03:40Z","timestamp":1777057420812,"version":"3.51.4"},"reference-count":143,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2025,10,7]],"date-time":"2025-10-07T00:00:00Z","timestamp":1759795200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001871","name":"FCT\u2014Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","doi-asserted-by":"publisher","award":["PTDC\/CTA-AMB\/4086\/2021"],"award-info":[{"award-number":["PTDC\/CTA-AMB\/4086\/2021"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Water"],"abstract":"<jats:p>Anthropogenic barriers fragment Portuguese rivers, threatening endemic freshwater fish communities. This study compiled national inventories and peer-reviewed research (2002\u20132024) to quantify fishway implementation, evolution and typology, while evaluating fish performance from published research. One hundred fishways built between 1950 and 2024 were recorded, half of which were constructed after the implementation of the Water Framework Directive in Portugal (29 Dec 2005), tripling the annual construction rate. Fishways were found to be associated mainly with weirs (46%) and small hydropower plants (44%), with typology being dominated by the pool-type design (67%), nature-like facilities (18%), fish locks and combined systems (6% each), fish lifts (2%) and a single eel pass. Forty scientific contributions addressed fishway effectiveness; three-quarters dealt with pool-type facilities, while 12.5% and 10% focused on nature-like fishways and lifts, respectively. Experimental and field studies highlighted species-specific hydraulic preferences, the benefits of vertical slot and multislot configurations, and the potential of retrofitting fishways with macro-rugosities (i.e., fixed structural elements placed on the bottom) to improve non-salmonid fish passage. However, low attraction efficiency, limited multi-season monitoring and risks of aiding invasive species remain a concern. Research needs are proposed, including the refinement of species-specific hydrodynamic criteria, and the development of standardized efficiency metrics and of selective passage solutions, to advance fishway performance under Mediterranean hydrological constraints.<\/jats:p>","DOI":"10.3390\/w17192898","type":"journal-article","created":{"date-parts":[[2025,10,7]],"date-time":"2025-10-07T10:48:07Z","timestamp":1759834087000},"page":"2898","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Fishways in Portugal: Status, Main Findings and Research Needs"],"prefix":"10.3390","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1232-2560","authenticated-orcid":false,"given":"Jos\u00e9 M.","family":"Santos","sequence":"first","affiliation":[{"name":"Centro de Estudos Florestais (CEF), Laborat\u00f3rio Associado Terra, Instituto Superior de Agronomia, Universidade de Lisboa, 1349-017 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7854-6850","authenticated-orcid":false,"given":"Ana L.","family":"Quaresma","sequence":"additional","affiliation":[{"name":"Centro de Investiga\u00e7\u00e3o e Inova\u00e7\u00e3o em Engenharia Civil para a Sustentabilidade (CERIS), Instituto Superior T\u00e9cnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3811-775X","authenticated-orcid":false,"given":"Filipe","family":"Rom\u00e3o","sequence":"additional","affiliation":[{"name":"Centro de Investiga\u00e7\u00e3o e Inova\u00e7\u00e3o em Engenharia Civil para a Sustentabilidade (CERIS), Instituto Superior T\u00e9cnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6573-9154","authenticated-orcid":false,"given":"Susana D.","family":"Amaral","sequence":"additional","affiliation":[{"name":"Centro de Estudos Florestais (CEF), Laborat\u00f3rio Associado Terra, Instituto Superior de Agronomia, Universidade de Lisboa, 1349-017 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8942-3792","authenticated-orcid":false,"given":"Daniel","family":"Mameri","sequence":"additional","affiliation":[{"name":"Centro de Estudos Florestais (CEF), Laborat\u00f3rio Associado Terra, Instituto Superior de Agronomia, Universidade de Lisboa, 1349-017 Lisboa, Portugal"}]},{"given":"Marta","family":"Santo","sequence":"additional","affiliation":[{"name":"Instituto de Conserva\u00e7\u00e3o da Natureza e das Florestas (ICNF), Av. 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Cidade de Goa, 2, 2685-038 Sacav\u00e9m, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4302-1958","authenticated-orcid":false,"given":"Paulo J.","family":"Pinheiro","sequence":"additional","affiliation":[{"name":"AQUALOGUS, Engenharia e Ambiente, Lda, Rua do Mar da China, No. 1 Escrit\u00f3rio 2.4, Parque das Na\u00e7\u00f5es, 1990-137 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3605-6164","authenticated-orcid":false,"given":"Ana T.","family":"Silva","sequence":"additional","affiliation":[{"name":"Norwegian Institute for Nature Research (NINA), H\u00f8gskoleringen 9, 7043 Trondheim, Norway"},{"name":"Vattenfall Research and Development, \u00c4lvkarleby Laboratory, 81470 \u00c4lvkarleby, Sweden"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7332-8136","authenticated-orcid":false,"given":"Teresa","family":"Viseu","sequence":"additional","affiliation":[{"name":"N\u00facleo de Recursos H\u00eddricos e Estruturas Hidr\u00e1ulicas, Departamento de Hidr\u00e1ulica e Ambiente, Laborat\u00f3rio Nacional de Engenharia Civil (LNEC), 1700-066 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2776-5420","authenticated-orcid":false,"given":"Pedro R.","family":"Almeida","sequence":"additional","affiliation":[{"name":"MARE\u2014Centro de Ci\u00eancias do Mar e do Ambiente\/ARNET\u2014Rede de Investiga\u00e7\u00e3o Aqu\u00e1tica, Instituto de Investiga\u00e7\u00e3o e Forma\u00e7\u00e3o Avan\u00e7ada, Universidade de \u00c9vora, 7002-554 \u00c9vora, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3900-1460","authenticated-orcid":false,"given":"Teresa","family":"Ferreira","sequence":"additional","affiliation":[{"name":"Centro de Estudos Florestais (CEF), Laborat\u00f3rio Associado Terra, Instituto Superior de Agronomia, Universidade de Lisboa, 1349-017 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1423-5391","authenticated-orcid":false,"given":"Ant\u00f3nio N.","family":"Pinheiro","sequence":"additional","affiliation":[{"name":"Centro de Investiga\u00e7\u00e3o e Inova\u00e7\u00e3o em Engenharia Civil para a Sustentabilidade (CERIS), Instituto Superior T\u00e9cnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2502-5533","authenticated-orcid":false,"given":"Paulo","family":"Branco","sequence":"additional","affiliation":[{"name":"Centro de Estudos Florestais (CEF), Laborat\u00f3rio Associado Terra, Instituto Superior de Agronomia, Universidade de Lisboa, 1349-017 Lisboa, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2025,10,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"549","DOI":"10.1002\/aqc.3950","article-title":"Bidirectional Connectivity in Fishways: A Mitigation for Impacts on Fish Migration of Small Hydropower Facilities","volume":"33","author":"Makrakis","year":"2023","journal-title":"Aquat. 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