page_title: Pánuco River
section_title: Ecology
hierarchical_section_title: Pánuco River / Ecology
caption_attribution_description: Français&#160;: Xiphophorus montezumae (mâle) - Aquarium Tropical du Palais de la Porte Dorée - Paris/France - 29/04/2015
context_page_description: The Pánuco River, also known as the Río de Canoas, is a river in Mexico fed by several tributaries including the Moctezuma River and emptying into the Gulf of Mexico. The river is approximately 510 kilometres long and passes through or borders the states of Mexico, Hidalgo, Querétaro, San Luis Potosí, Tamaulipas, and Veracruz. Since one of the headwaters of the Moctezuma River is the Tula River, the Pánuco ultimately drains the Valley of Mexico containing Mexico City.
context_section_description: The Pánuco River basin is rich in fish. There are almost 100 fish species, including a few that were introduced. There are many endemics: six Nosferatu cichlid species, five Tampichthys minnows, nine "northern swordtails" (genus Xiphophorus), three Gambusia species, two Ictalurus catfish, the bluetail goodeid (Ataeniobius toweri), dusky splitfin (Goodea gracilis), relict splitfin (Xenoophorus captivus), pygmy shiner (Notropis tropicus), checkered pupfish (Cualac tessellatus), broadspotted molly (Poecilia latipunctata), Tamasopo cichlid (Herichthys tamasopoensis), Calabazas shiner (Notropis calabazas) and fleshylip buffalo (Ictiobus labiosus). Additionally, a couple of still-undescribed species are known from this river basin. A few of the endemics are seriously threatened.
caption: The Montezuma swordtail is one of nine species of swordtail found only in the Pánuco River basin
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