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Barbo comizoThere are inventoried 18 fish species in the National Park of the Sierra de Guadarrama and in its Peripheral Zone of Protection. Overall, the Sierra de Guadarrama has some biogeographic peculiarities regarding its ichthyofauna. For some species, such as the “Bermejuela” (Achondrostoma arcasii) or the “Lamprehuela” (Cobitis calderoni), the Sierra de Guadarrama constitutes their southern limit of distribution. On the other hand, for several other species, such as the Iberian barbel (Barbus comizo), it marks their northern border. As in most of Spanish rivers, there have been several fish species introductions in these water streams. Among the ones that occurred in the limits of the protected space, the Pumpkinseed (Lepomis gibbosus), the Iberian gudgeon (Gobio lozanoi), the Common Carp (Cyprinus carpio) and the Goldfish (Carassius auratus), are particularly noticeable.

The Sierra de Guadarrama spills its waters on its Castilian-Leonese side only to the drainage basin of the Duero, while the Madrid area is part of the Tajo basin. The comparison between the fish community of the Duero basin (Segovia) and the Tajo basin (Madrid) reveals a noticeable difference, with a fish community less rich in the Segovian slope, although better preserved, since there are fewer introduced or exotic taxa.

In the medium-high and high sections of the Segovian area, the predominant species is the Common trout, often associated with the Iberian gudgeon. In somewhat slower but well preserved zones, we find the Bogue, the “Bordallo” (Squalius carolitertii) and occasionally the “Lamprehuela”.  On the other hand, in Madrid slope the areas with the highest species wealth are the Manzanares, Guadarrama and Lozoya rivers upper courses. Specifically, among the three rivers having the highest species richness in the Sierra, the high section of Lozoya shows a high conservation value, being most important species the Common trout (Salmo trutta), the Common barbel (Barbus bocagei), the Bogue (Chondrostoma polylepis), the Bordallo (Squalius pyrenaicus), the Bermejuela (Achondrostoma arcasii), the Calandino (Iberocypris alburnoides) and the Lamprehuela (Cobitis calderoni).

Among the fish fauna living in the river network intersected by the protected area, three species are classified as extinction risk status at the Community of Madrid level (the “Calandino”, the “Lamprehuela” and the Iberian barbel). On the other hand, none of these species is included in the National Catalog. Among all 17 species present in the protected area, there is a high rate of endemicity in a relatively small area, with the presence of 9 Iberian endemism.

Down below you can find a brief description of the most significant fish in the high mountain environments of the National Park:

More about nature

Geology and Lithology

Rock types and geological history of the Sierra de Guadarrama.

Sistema de observación meteorológica

×* There is no translation available.* El parque nacional cuenta con una red de estaciones meteorológicas de alta montaña.


Around 1680 species and subspecies of plants inhabit the national park.

Estado del tiempo

×* There is no translation available.* Boletín de las últimas 48h, previsión del peligro de aludes (si está en vigor) y predicción meteorológica.

Vegetation and Natural Systems

Get to know the vegetation of the national park, with 8 natural systems represented.


Information on the reptiles of the Sierra de Guadarrama, some of them very little known.


Dozens of bird species fly the skies of the Sierra, including some of the most emblematic species of the national park.


The little-known fauna of the Sierra de Guadarrama.

The Sierra de Guadarrama Climate

Description of the climatology of the national park.


The species that inhabit the mountain rivers, some of them unfortunately introduced.

Sierra de Guadarrama Rivers

Mountain rivers and streams are an essential feature of the national park.

Peñalara: glaciology and glacial vestiges

The best glacial remains of Sierra de Guadarrama

Exceptional trees

Magnificent specimens of different species with exceptional characteristics.

Peñalara Massif wetlands

The Peñalara Massif is the site with the highest concentration of high mountain lakes and ponds in the Sierra de Guadarrama.


Dozens of mammal species inhabit the Sierra de Guadarrama.


Fungi play a fundamental role in the ecology of the Sierra de Guadarrama.

La Pedriza: a particular granite batholith

La Pedriza is a singular mountain relief, unique in the Iberian Peninsula.


Dozens of species growing on trees, on rocks, covering the ground.....


The Sierra de Guadarrama has a high richness of amphibian species.

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