I think this is a Pumpkinseed (Lepomis gibbosus) Portuguese: Perca sol. An invasive alien species from USA
Encontrada: Rio tejo, perto das Portas de Rodão 13 (MORTA!)
I think this is a Bleak (Alburnus alburnus) Portuguese: Alburno. This fish is fast swimming and has a luminous greenish stripe along its side.
Southern Iberian Spined Loach (Cobitis paludica) Portuguese: Verdemã comum