Salamanders in Spain are mainly nocturnal creatures. Anyway the northern coast and his mountains have a weather completely different of the rest of the country. In raining days of late summer you can see, sometimes, fire salamanders and marbled newts walking around the lakes and crossing the roads.
About the fishes, it's a problem here. Few years ago fishermen and local politics have introduced in some mountain lakes Salmo salvelinus in the Eighties ( as happened also in some lakes of the Balkans ): This was a serious problem, for example on the lake of Ercina in Covadonga, and Mesotriton alpestris cyreni was specially affected for this. Fortunately the salmonids doesn't prospered and now the population of newts are growing again.
So... fishes and newts together? never again...