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The ichthyofauna of the River Minho tidal freshwater wetlands (TFWs) was studied in a semienclosedarea, between June 2007 and May 2010, to determine temporal patterns of abundance, biomass andspecies composition. Fish catches, standardized by the number of fyke nets and by the fishing effort, wereanalysed and related to river flow, water temperature and precipitation. In total, 21 fish species were identifiedincluding six non-indigenous species (NIS) which represented 15% of the total captures (yet 43% of the biomass).Regarding ecological guilds, 82% were freshwater species (61% of the biomass) which included allNIS, whereas 13% of the catches were catadromous species (31% biomass) corresponding to eels. Only 4%were estuarine species (1% biomass) and together marine estuarine opportunists and anadromous species accomplished1% (2 and 6% biomass, respectively). The fish assemblage showed seasonal patterns with a cleardistinction between autumn/winter and spring/summer periods. Significant differences in abundance and biomasswere also detected between autumn/winter of 2007/2008 and 2008/2009, i.e., inter-annual variations,with the latter period with lower catches yet higher dominance of NIS. Besides, higher water temperature hada significant negative effect on the observed number of species, but a positive effect on the abundance andbiomass of NIS. More attention has to be given to TFWs and their role in structuring fish assemblages, becausethis information is vital for a sound management, conservation and restoration of estuarine areas.The authors would like to thank Rodrigo Lopez for the study area map arrangement and Eduardo Martins for the field work assistance. This research was partially supported by the European Regional Development Fund (ERDF) through the COMPETE - Operational Competitiveness Programme and national funds through FCT - Foundation for Science and Technology, under the project PEst-/MAR/LA0015/2013

Seasonal changes in fish assemblages in the River Minho tidal freshwater wetlands, NW of the Iberian Peninsula