Male from Tamazula
Male from Tamazula, Tuxpan River [Jalisco]. Photo by Juan Miguel Artigas Azas. (25-May-2014). determiner Juan Miguel Artigas Azas





Last updated on:

Xenotoca lyonsi Domínguez-Domínguez, Bernal-Zuñiga, Piller, 2016

Become a subscriber

Unlock the full content of this and all other documents, images, and videos by becoming a subscriber of the Freshwater Fishes of Mexico. Get the best information about Mexican freshwater fish! You can also open the full profile for everyone to see by sponsor this species and support the Freshwater Fishes of Mexico

subscribe login

Original description as Xenotoca lyonsi:


Conservation: Xenotoca lyonsi is evaluated by the international union for the conservation of nature in the iucn red list of threatened species as (CR) critically endangered (2018). Xenotoca lyonsi is known only from a few sites along its original distributional range, and is reported to have been extirpated from approximately 60% of the historical localities where it has been reported. All the areas where the species originally occurred are highly impacted by human activities, being totally modified for agricultural purposes, with sugar cane plantations demanding high water resources and discharging polluted water from the production process. Also, untreated urban waste into the river is a substantial ecological problem in the area. In several recent surveys for the species, it was never located downstream of the village waste water discharges and, when found, it was always upstream of the discharge sites. Also, the species is not abundant in the few localities from where it is currently known to exist (Domínguez Domínguez et al., 2016:93, Lyons et al., 2019:145, Köck, 2019).